Phosphate Application Research Articles

Structure and optical properties of stable Bi/Eu codoped borophosphate La7O6(BO3)(PO4)2 phosphors for application in wLEDs

Rare-earth (RE) and/or transition metal (TM) ions (co)doped phosphors have garnered much attention for promoting development in the fields of solid state lighting (SSL) and displays. It is a meaningful work to design high-quality phosphor via intelligent assembling from wide variety of compounds with RE/TM ions. Herein, the lanthanum borophosphate La7O6(BO3)(PO4)2 (LOBP) and Bi/Eu were selected as host and dopants for constructing the phosphor LOBP: Bi/Eu via solid phase synthetic method due to simple synthesis, chemical/thermal stability, rich cationic sites, appropriate bandgap, and controllable optical tuning from synergistic effect of cyan (Bi) and red (Eu) emissions, respectively. The structure and site occupations were analysed via XRD and Rietveld refinements, showing Bi3+ ions were only resided in La3+ sites within the monoclinic matrix (P21/n) and appeared greater inclination towards the La sites with coordinate number (CN) = 8 as compared with CN = 7 due to the closer ion radius ratio. While Eu3+ ions entered into the two distinct La sites with almost the same probability. The morphology and elemental mapping were obtained via SEM/EDS, exhibiting irregular particle shape with micron-level size, and the chemical composition met expectation. Through energy transfer (ET) from Bi to Eu under n-UV excitation, the adjustable photoluminescence (PL) from cyan traversing white and finally to red could be achieved. The concentration quenching for both singly- (Bi) and co-doped (Bi/Eu) phosphors were charged by the d-d interactions. Finally, the stable as-fabricated n-UV pumped wLED via coupling the composition-optimized white-emitting LOBP: 2%Bi, 7%Eu to a commercial 305 nm n-UV LED chip shows splendid performances.

Effect of foliar supplementation of water soluble fertilizer on growth, yield and economics of wheat crop (Triticum aestivum L.)

A field experiment was conducted during rabi season of 2015-16 at Agronomy Research Farm of Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana, to evaluate the effects of foliar application of water soluble fertilizers on growth, yield attributes and yield of wheat. The soil of the experimental plot was sandy loam in texture, low in available nitrogen (131.3 kg ha-1), medium in available phosphorus (17.2 kg ha-1), and high in available potassium (335.4 kg ha-1). The soil was alkaline in reaction (pH 7.8). The experiment was laid out in randomized block design with 17 treatments having three replications. The treatments comprising two fertilizers level i.e., Recommended dose of fertilizer (RDF) (150 kg N + 60 kg P2O5 + 60 kg K2O ha-1) and 75% of RDF and supplemented with foliar application of water soluble fertilizers viz. Urea phosphate (17:44) @ 1.5%, NPK (18:18:18) @ 1.5%, ZnSO4 @ 0.5% and Urea 2% at different stages. One treatment was control where no fertilizer applied. Growth parameters viz, plant height, dry matter accumulation, crop growth rate and leaf area index were increased with T9 i.e., RDF along with foliar application of water soluble fertilizers NPK (18:18:18) @ 1.5% at 40 DAS followed by Urea phosphate (17:44) @ 1.5% at 65 DAS. Among treatments, application of RDF along with foliar application of water soluble fertilizers NPK (18:18:18) @ 1.5% at 40 DAS followed by Urea phosphate (17:44) @ 1.5% at 65 DAS exhibited the highest values of yield attributes, viz. effective tillers/ meter row length (mrl), number of spikeletes/spike, number of grains/spike and 1000-grains weight which led to the highest grain yield (6220 kg ha-1) However, alternate application of NPK (18:18:18) @ 1.5% and Urea phosphate (17:44) @ 1.5% or vice versa produced statistically similar grain yield of wheat at the same level of fertilizer application. RDF or 75% RDF along with foliar application of NPK (18:18:18) @ 1.5% was slightly superior as compared to RDF or 75% RDF along with foliar application of Urea phosphate (17:44) @ 1.5% irrespective of time of application.

Evaluation of immunohistochemical expression of collagen type I in bone defect treated by local application of collagen and beta-tricalcium phosphate in rats.

Aims: This study aimed to estimate outcome of combined application of collagen/β-tricalcium phosphate (Coll /β- TCP) on bone defect healing by immuno-histochemical localization of collagen type I. Materials and Methods: A total of 20 adult male rats (albino rats) were used in this study. Four intra bony defects were created in both femurs of each rat, three defects were treated with Coll, β- TCP and combination of Coll /β- TCP while forth defect left to heal spontaneously as control. Scarif i cation of animals was done after 2- and 4-weeks healing periods (10 rats for each). Immunohistochemical localization of collagen type I (COL1) monoclonal antibody was done for all bone specimens. Results: Immunohistochemical results showed positive expression of (COL1) by bone cells osteoblast (OB), osteocyte (OC), osteoclast (OCL) and bone marrow stromal cells (BMSCs) at 2- and 4-week duration for all examined groups with variable rates of intensity. Mean values of immunoreactive score (IRS) decreased with time for bone cells and for BMSCs except for OC where values increased with time as the highest values were recorded in combination group at 4 weeks. Conclusions: Combined application of (Coll /β- TCP) was ef f ective in accelerating bone healing process through elevating the IRS of (COL1) noticed by osteo-blast, osteocyte and bone marrow stromal cells.

Synthesis and Application of Sustainable Tricalcium Phosphate Based Biomaterials From Agro-Based Materials: A Review.

Trends in health care delivery systems have shifted as a result of the modern uses of biomaterials in medicine. Contrary to traditional medicine, modern healthcare are now useful in solving problems that were considered impossible some years back. One of the most significant factors to the most recent advancements in implant development has been the use of calcium based materials in the creation of necessary implants in the form of soft and hard tissues. With the advent of naturally sourced materials in the manufacturing of biomaterials, lots of attention are now focused on the different sources of agro-based resources that can be used for the product developments. These agro-based materials are now been considered for sustainable and ecological purposes in several areas of applications globally in the recent times. Hence, the review was carried out with focus on the sources, relevance, processing techniques and applications of tricalcium phosphate based biomaterials in modern day healthcare delivery. This review provides a historical and prospective picture of the crucial functions that materials based on tricalcium phosphate will play in fulfilling human requirements for medication.

ВИРОЩУВАННЯ СОРГО ЗЕРНОВОГО НА КИСЛИХ ГРУНТАХ В УМОВАХ ЗАКАРПАТСЬКОЇ ОБЛАСТІ

The work aims to conduct production field research to determine the potential yield level of grain sorghum on acidic soils, as well as work out the generally accepted basic elements of cultivation technology with its subsequent cultivation in the Zakarpattia region. Materials and methods. In 2023, the production range for growing grain sorghum at Karpatiagroproduct LLC was located in the lowland zone of Uzhgorod district, Zakarpattia region. The article describes agrotechnical operations related to soil cultivation, application of fertilizers and plant protection products that were used in the farm, the main of which was the application of mineral fertilizer diammonium phosphate (NP 18:46) at the rate of 160 kg during sowing. The sowing rate was 165,000 seeds per hectare with a row width of 37 sm. Results. Sorghum is not picky about soils, so it can grow on both clay and sandy soils. The landfill where sorghum was grown is characterized by a low content of mobile phosphorus (6.33 mg/kg), a very low content of total nitrogen (N-NO3- + N-NH4+ – 8.92 mg/kg). According to the degree of acidity, the soil belongs to a very acidic soil (the hydrogen index of the saline extract of the soil is 4.08). In the economic conditions of 2023, the yield of sorghum grain hybrid Iceberg was 4.4 t/ha, which is 1.0 t/ha more than the average yield of sorghum in Ukraine over the past 10 years. Taking into account the genetic potential of this crop and the sufficient level of moisture supply of the territory, the level of the sorghum harvest should be twice as large. Because sorghum is not recommended to be grown on acidic, waterlogged soils with a close occurrence of groundwater, the underachieved level of the harvest to some extent may be related to this. In addition, the low content of mobile phosphorus and very low content of available nitrogen, which is characteristic of acidic clay soils, to some extent negatively affected the processes of crop yield formation. Conclusions. The obtained sorghum yield at Karpatiagroproduct LLC - 4.4 t/ha is lower than the average yield in Italy, by 2.6 t/ha, and in France - by 0.6 t/ha. However, it was in the territory of Ukraine that the record yield of sorghum in the world was obtained - 14.43 t/ha, which testifies to the high potential of grain sorghum and the unlimited potential of scientific and industrial research to reveal the genetic expression of this crop. Keywords: grain sorghum, yield, soil pH, «Iceberg» hybrid, agricultural technology.

Synthesis and catalytic application of nanostructured metal oxides and phosphates.

The design and development of new high-performance catalysts is one of the most important and challenging issues to achieve sustainable chemical and energy production. This Feature Article describes the synthesis of nanostructured metal oxides and phosphates mainly based on earth-abundant metals and their thermocatalytic application to selective oxidation and acid-base reactions. A simple and versatile methodology for the control of nanostructures based on crystalline complex oxides and phosphates with diverse structures and compositions is proposed as another approach to catalyst design. Herein, two unique and verstile methods for the synthesis of metal oxide and phosphate nanostructures are introduced; an amino acid-aided method for metal oxides and phosphates and a precursor crystallization method for porous manganese oxides. Nanomaterials based on perovskite oxides, manganese oxides, and metal phosphates can function as effective heterogeneous catalysts for selective aerobic oxidation, biomass conversion, direct methane conversion, one-pot synthesis, acid-base reactions, and water electrolysis. Furthermore, the structure-activity relationship is clarified based on experimental and computational approaches, and the influence of oxygen vacancy formation, concerted activation of molecules, and the redox/acid-base properties of the outermost surface are discussed. The proposed methodology for nanostructure control would be useful not only for the design and understanding of the complexity of metal oxide catalysts, but also for the development of innovative catalysts.

Effects of different water‐soluble phosphorus on the distribution and utilization of phosphorus in maize in Xinjiang, China

AbstractPhosphorus (P) is the main limiting nutrient in agriculture. Most of the P fertilizers applied to the soil remain ineffective because of the weak movement and transfer of P in the soil. Current agricultural production requires large amounts of P fertilizers, leading to the accumulation of residual P in the soil and serious ecological problems. Fixation of P is a vital reason for limited fertilizer effectiveness. Therefore, improving soil P effectiveness is the key to reducing soil P accumulation. This study explored the effects of different water‐soluble P fertilizers on maize yield and economic benefits by comparing the relationships between soil P distribution and P absorption and utilization of maize in calcareous soil of Xinjiang province in China. The main results indicated that (1) the drip application of ammonium polyphosphate (APP) and urea phosphate (UP) was more beneficial for increasing the total P content in the deep soil layer; the drip application of APP was beneficial in increasing the available P content of the deep soil layer. (2) Dripping acid fertilizer was more conducive to reducing soil acidity and alkalinity (pH). (3) The application of different P fertilizers favoured the accumulation of P in all organs of maize, among which APP and UP were the most effective since they increased accumulation by 75.8% and 60.4% (at the flowering stage) and 98.2% and 62.3% (at the maturity stage), respectively, compared with CK (without P fertilizer). (4) pH was the main factor affecting P uptake and transformation, and the drip application of P fertilizer had the most significant effect on pH. (5) The application of different water‐soluble P fertilizers increased maize yield and economic benefits. Among the five water‐soluble P fertilizers selected in this study, APP had the greatest economic benefits, followed by UP and monoammonium phosphate (MAP); they increased yields by 31.6%, 24.5%, and 22.0%, respectively, compared with CK.

A novel bismuth-activated Sr3NaSbO6 phosphor with multi-band switchable emission for NUV-pumped LEDs.

Multi-band emission characteristics open up more possibilities for the application of phosphors in LEDs. In this work, a novel Bi3+-activated Sr3NaSbO6 phosphor is developed. The Bi3+ occupation, luminescence properties and application in LEDs of the phosphor are investigated and discussed. There are Sr and Na sites in the crystal structure for Bi3+ substitution, corresponding to two different luminescence centers, which can be excited by commercial UV chips. By changing the excitation wavelength, Bi3+ in the two lattice sites can be excited separately, and a switchable multi-band emission can be obtained accordingly. The blue emission peaks at 450 nm, and the other emission has an ultra-wide full-width at half-maximum of 206 nm, which can cover a wider visible spectrum. All the results show that the phosphor has application prospects in LEDs.

Fertilizer management practices in potato cultivation: a baseline study for the introduction of GE potato in Bangladesh.

Genetically engineered (GE) crops have the potential to contribute to agricultural sustainability, food security, and nutritional enrichment. However, these crops cannot be released for commercial cultivation without undergoing environmental risk assessments (ERA), thus biosafety evaluation. ERA assessments are performed comparatively with their natural non-GE counterparts. As Bangladesh is progressing with GE potato research, the present study aims to collect baseline information on non-GE potato cultivation with an emphasis on current agronomic practices focusing on fertilizer management and farmers' knowledge base. The survey had three parts, including information on the farmers, information on potato cultivation practices, especially fertilizer use, and lastly, the farmer's view on GE potato. From 2020 to 2021, data were collected through interviews with experienced growers in four potato-growing regions, the Central and Mid-East, North-West, Mid-West, and South-East regions (n = 1757) of the country. The study revealed that farmers of all regions used more than the recommended amounts of fertilizer; for instance, 67.1% more nitrogen fertilizer was applied as an extra dose during potato cultivation in Munshiganj (Central and Mid-East) than in the Dinajpur region (North-West). This overuse of nitrogen fertilizer can enhance plant vigor but makes the plants more susceptible to insect attraction and allows pests easier access to the plants. As a result, the excess dose of nitrogen fertilizer in Munshiganj may act as a catalyst to increase the probability of late blight. The findings also showed that 73.6% of farmers observed unexpected flowering in certain potato cultivars, which corresponded to the higher application of phosphate and potassium fertilizers aimed at late blight control. Furthermore, this study reported infestations of Solanaceous weeds, specifically Solanum torvum and Physalis heterophylla, in potato fields. Finally, our findings demonstrated that more than 68.7% of the potato growers intend to adopt disease-resistant GE potato as that may reduce the need for excess fertilizer use and thus reduce cultivation costs.

Spectroscopic properties, Judd Ofelt analysis of U and Eu activated Li2O-ZnO-SrO-B2O3-P2O5 borophosphate glasses for solid-state lighting applications

Uranium and europium doped borophosphate glasses with the base composition of (Li2O)(ZnO)0.5(SrO)0.4(B2O3)2.55(P2O5)0.5 were synthesized by melt -quenching. The X-ray diffraction profile affirmed that all the synthesized samples were devoid of crystallinity and amorphous in structure. The absence of precipitations/grains in the scanning electron micrographs further validated the amorphous character and compositional homogeneity of the prepared glass. The FTIR spectra revealed several prominent vibrational bands in 713–1568 cm−1 range and were assigned to the corresponding B-O-B and P-O-P and B-O-P bonding. The thermal characteristics of the synthesised glass samples were investigated using differential thermal analysis experiments. The broad photoluminescence (PL) spectra observed for the uranium doped glass with emission maxima at 523 nm resembles the hexavalent U(VI) emission in a disordered amorphous environment. The emission profile of the Eu doped glass displayed several characteristics peaks due to 5D0 → 7FJ transitions. The phonon energy of the base glass was found to be 1005 cm−1. The Judd-Ofelt analysis showed that for all the doped glass, the JO intensity parameter Ω4 was always greater than Ω2 indicating that Eu3+ ions are primarily arranged in a centrosymmetric environment in the studied host. Radiative properties of 5D0 → 7FJ=1-4 transitions of the Eu3+ such as branching ratios, emission cross-section, and transition probabilities were computed. Energy transfer pathways of UO22+ → Eu3+ in the codoped borophosphate glass were described. The CIE chromaticity and PL results suggest that the intense red emission of Eu doped glasses could be useful for phosphor applications.

Multifunctional near-infrared long persistent luminescence phosphor BaLu2Al2Ga2SiO12:Cr3+, Tb3+ with good thermal stability, promising quantum efficiency, and excellent environmental resistance

Near-infrared (NIR) persistent luminescence (PersL) phosphors have gained significant study attention in bioimaging and biomedical fields due to the advantages of persistent emission and elimination of biological tissue autofluorescence. However, PersL phosphors generally have difficulty in guaranteeing both good thermal stability and external quantum efficiency (EQE), which limits the multi-functional applications of NIR PersL phosphors. Herein, we developed a novel multifunctional NIR PersL phosphor BaLu2Al2Ga2SiO12:Cr3+ (BLAGSO:Cr3+). Interestingly, this NIR phosphor has good thermal stability (99.7 %@150 °C for BLAGSO:0.03Cr3+) and promising EQE (31.08 % for BLAGSO:0.03Cr3+). To further improve its PersL performance, Tb3+ ion which is believed to act as a modulator of matrix defects and enhances the storage capacity of traps for electrons is introduced into BLAGSO:0.03Cr3+ and an optimal PersL duration of more than 48 h is achieved. Meanwhile, BLAGSO:0.03Cr3+, 0.03 Tb3+ also exhibits good photo-stimulated PersL (PSPL) ability, and the quenched PersL can be rejuvenated by external photo-stimulation. The potential uses of BLAGSO:0.03Cr3+, 0.03 Tb3+ in NIR pc-LEDs and bioimaging are explored and demonstrated. This work is anticipated to drive the research of multifunctional NIR PersL phosphors.

Advances in Reversible Luminescence Modification and Applications of Inorganic Phosphors Based on Chromism Reaction

AbstractThe reversible luminescence modification of inorganic phosphors has emerged as a promising field, enabling innovative applications such as optical memory, multiple anti‐counterfeiting, and photoswitches. Traditional luminescence modulation techniques, such as core–shell structure design and energy transfer‐related luminescent ions regulation, face challenges in achieving reversible luminescence modification. Chromism induces reversible color changes in materials when stimulated by external fields such as electricity, heat, and light. Combining chromism with luminescence enables the creation of chromism‐driven reversible luminescence manipulation in a single material. This review summarizes recent advances in reversible luminescence modification of inorganic phosphors based on chromism reaction and highlights their potential applications in optical data storage, fingerprint acquisition, and anti‐counterfeiting areas. The potential prospective research directions are also discussed and the challenges and opportunities of chromism‐based reversible luminescent materials are presented for further extended applications.

Fabrication of (Zn,Mg)O Thin Films Dispersed with ZnO Nanocrystals by Mist CVD for Phosphor Applications

Fabrication of (Zn,Mg)O Thin Films Dispersed with ZnO Nanocrystals by Mist CVD for Phosphor Applications

Optimum Nitrogen, Phosphorous, and Potassium Fertilizer Application Increased Chrysanthemum Growth and Quality by Reinforcing the Soil Microbial Community and Nutrient Cycling Function

Nitrogen (N), phosphorus (P), and potassium (K) are three macronutrients that are crucial in plant growth and development. Deficiency or excess of any or all directly decreases crop yield and quality. There is increasing awareness of the importance of rhizosphere microorganisms in plant growth, nutrient transportation, and nutrient uptake. Little is known about the influence of N, P, and K as nutrients for the optimal production of Chrysanthemum morifolium. In this study, a field experiment was performed to investigate the effects of N, P, and K on the growth, nutrient use efficiency, microbial diversity, and composition of C. morifolium. Significant relationships were evident between N application rates, C. morifolium nutrient use, and plant growth. The N distribution in plant locations decreased in the order of leaf > stem > root; the distributions were closely related to rates of N application. Total P fluctuated slightly during growth. No significant differences were found between total P in the roots, stems, and leaves of C. morifolium vegetative organs. Principle component analysis revealed that combinations of N, P, and K influenced soil nutrient properties through their indirect impact on operational taxonomic units, Shannon index, and abundance of predominant bacterial taxa. Treatment with N, P, and K (600, 120, and 80 mg·plant−1, respectively) significantly improved plant growth and quality and contributed to the bacterial richness and diversity more than other concentrations of N, P, and K. At the flowering time, the plant height, leaf fresh weight, root dry weight, stem and leaf dry weight were increased 10.6%, 19.0%, 40.4%, 27% and 34.0%, respectively, when compared to the CK. The optimal concentrations of N, P, and K had a positive indirect influence on the available soil nutrient content and efficiency of nutrient use by plants by increasing the abundance of Proteobacteria, decreasing the abundance of Actinobacteria, and enhancing the potential functions of nitrogen metabolism pathways. N, P, and K fertilization concentrations of 600, 120, and 80 mg·plant−1 were optimal for C. morifolium cultivation, which could change environmental niches and drive the evolution of the soil microbial community and diversity. Shifts in the composition of soil microbes and functional metabolism pathways, such as ABC transporters, nitrogen metabolism, porphyrin, and the metabolism of chlorophyll II, glyoxylate, and dicarboxylate, greatly affected soil nutrient cycling, with potential feedback on C. morifolium nutrient use efficiency and growth. These results provide new insights into the efficient cultivation and management of C. morifolium.

Does an Alteration in Nociceptive Response to Mineral Components of Dental Composites Involve Changes in Oxidative Status? A Brief Report

Abstract Since that use of bioactive mineral components of dental composites have been accompanied with various toxicities, including neurotoxicity, the aim of the study was to examine the effect of chronic application of hydroxyapatite, tricalcium phosphate and amorphous calcium phosphate in nanoparticles (nHA, nTCP, nACP) to parameters of sensitivity to thermal pain stimuli. Although the systemic toxicity of those compounds is frequently attributed to an oxidative damage, we also decided to examine the potential effects of Filipendula ulmaria extract on nociception alterations induced by the nano-sized mineral components of dental composites. Forty-two Wistar albino rats were divided into control and six experimental (equal) groups that orally received either nHA, nTCP, nACP alone, or simultaneously with FU extract for 30 days. Nociceptive alterations were quantified in the hot plate and tail flick test. The chronic administration of nHA and nACP resulted in significant increase in reactivity to thermal stimulus, with no significant change observed in nTCP group when compared to the control in the hot plate test, while simultaneous application of FU extract prevented any significant alteration of time to respond. The reaction time in the tail flick test for all three groups that received only nano calcium phosphates was reduced, with no changes in the groups treated with FU extract. The results of this study confirmed that calcium phosphates of mineral components of dental composites produced hyperalgesic effects, and this side effect were significantly attenuated by antioxidant supplementation.

Microstructure, mechanical properties and biomedical application of medical implantable extruded Mg-Zn-Zr-Ca alloy

This study added Zn, Zr and Ca as alloying elements of magnesium alloy (ZKX500) and produced fine grain structure by extrusion process. After 2 h of homogenization, abnormal grain growth was avoided, stress relief, improvement of stability and reduction of element segregation are achieved. In addition, application of phosphate coating on homogenized ZKX500, the mechanism of coating degradation and mechanical properties after degradation were accomplished and determined that the corrosion resistance of ZKX500 can be enhanced by homogenization and phosphate coating. To further enclose clinical-applying condition, ZKX500 screw undergoes 2 h of homogenization and phosphate coating, then immersed in simulated body fluid (SBF). The degradation rate of ZKX500 screw meets application requirement, which demonstrated homogenization and phosphate coating improved degradation behavior and mechanical properties of ZKX500 screws and exhibited its potential of clinical application.

Growth and Yield of Grain Cowpea (Vigna unguiculata sub sp. cylindrica) in Response to Foliar Nutrition and Graded Levels of Phosphorus and Potassium

Aim: To assess the growth and yield of grain cowpea in response to varied doses of phosphorus (P) and potassium (K) supplemented with foliar application of nano diammonium phosphate (DAP) and potassium salt of active phosphorus (PSAP).
 Study Design: The field experiment was a factorial experiment, laid out in randomised block design with two levels of P, three levels of K and two sources of foliar nutrition, compared against a control, with three replications.
 Place and Duration of Study: The study was conducted at the Integrated Farming System Research Station, Karamana, Nedumcaud, Thiruvananthapuram, Kerala, India, during the period from December 2022 to February 2023.
 Methods: The study utilized PGCP-6 cowpea variety and adopted fertilizer recommendations as per KAU POP (Package of Practices Recommendations of the Kerala Agricultural University). The entire dose of FYM, P and K and half dose of nitrogen (N) were applied as basal dose. The remaining half dose of N was applied at 15 days after sowing (DAS). Additionally, foliar application of nano DAP and PSAP (each @ 0.4 %) was done at 20 DAS and 40 DAS.
 Results: The results of the study revealed that the treatment combination, p2k1f2 and p2k1f1 had comparable leaf area per plant and leaf area index (LAI) (at 60 DAS). The highest seed yield (1642 kg ha-1) was recorded with p2k1f2. Higher dose of P and K along with foliar application of nano DAP (0.4 % at 20 DAS and 40 DAS) had significant effect on the total DMP and haulm yield.
 Conclusion: Combined application full dose of N, half dose of P, full dose of K and foliar application of PSAP (0.4 %) at 20 DAS and 40 DAS could be recommended as the best treatment combination for yield enhancement in grain cowpea.

Effects of application of phosphate and phosphate-solubilizing bacteria on bacterial diversity and phosphorus fractions in a Phaeozems

The aim of this study is to improve the utilization of phosphorus (P) in soil, and to study the effects of phosphate-solubilizing bacteria (PSB) on P fractions and bacterial communities. In this experiment, we reduced the amount of P fertilizer by 30 % and 40 % respectively to studied the effects of combined application of bacterial fertilizers on soil microbial community and phosphate transformation process under different fertilization rates. The results showed that the application of PSB affected the transformation process of different P fractions. PSB had the most significant impact on organic phosphorus (p < 0.05). Correlation analysis showed that the abundance of bacteria was significantly correlated to the P fractions, indicating that the application of PSB had affected the bacterial community structure. In addition, Structural Equation Model (SEM) analysis showed that there was a causal relationship between the various visual variables. SEM confirmed the response relationship between bacterial communities and P components. Based on these results, we concluded that the application of PSB increased the sensitivity of P components, especially Olsen-P and MBP, to soil microorganisms. The application of PSB is an effective method to improve P utilization.

Multi-site occupancy high-efficient Mg2LaTaO6:Cr3+ phosphor for application in broadband NIR pc-LEDs

As a new generation of near-infrared (NIR) light source, phosphor-converted NIR light emitting diodes (NIR pc-LEDs) have broad application prospects in biological tissue imaging, night vision and chemical composition analysis. However, most NIR emitting phosphors are still limited to short-wavelength, narrow-band emission and low efficiency. Here, based on the multi-site occupation strategy, the NIR phosphor Mg2LaTaO6:Cr3+ (MLT:Cr3+) achieves an efficient broadband NIR emission with the full width at half maximum (FWHM) of 203 nm in the range of 600–1300 nm under the excitation of 468 nm blue light. The phosphor MLT:0.01Cr3+ not only exhibits an excellent internal quantum efficiency (IQE) of 85.6 %, but also has good thermal stability and remains about 64.2 % photoluminescence (PL) intensity of room temperature at 423 K. Furthermore, the MLT:0.01Cr3+ phosphor was combined with a blue LED chip to fabricate the NIR pc-LED device, and its potential applications were successfully realized in information encryption, bioimaging and the qualitative or quantitative analysis of mixture of ethanol and water.

Blue Ca4MgAl2Si3O14:Ce3+, Li+ phosphor with excellent performance for human-centered green plant growth lighting

Light-emitting diodes (LEDs) can regulate the light environment for plant growth to increase productivity. Deep blue light, which plays a pivotal role in plant photosynthesis, has received limited attention in research due to the challenges associated with synthesizing a blue phosphor exhibiting high thermal stability, high quantum efficiency and spectral similarity to plant response spectra. This study presents the synthesis and characterization of a blue phosphor Ca4MgAl2Si3O14:xCe3+,yLi+, which is characterized by remarkable thermal stability and quantum efficiency reached through charge compensation. The introduction of Li+ ions eliminates cation vacancy defects, mitigates charge imbalance due to heterovalent substitution, and acts as a flux, thereby effectively suppressing energy transfer between Ce3+ ions and significantly improving several key properties of the phosphor. Notably, the emission intensity is significantly enhanced, the internal quantum efficiency was increased from 74.2 to 91.6 %, and the external quantum efficiency was improved from 54.9 to 67.7 %. Moreover, the thermal stability at 423 K was augmented from 71 to 82 %. Of particular importance is the exceptional alignment of the phosphor's spectrum with the absorption spectrum of chlorophyll-a (with a spectral resemblance of SRchlorophyll-a = 94.39 %). These findings underscore the great potential of Ca4MgAl2Si3O14:xCe3+,yLi+ phosphors in applications related to plant growth lighting.