Influence Of Nutrient Concentration Research Articles

The influence of nutrient concentration and hydroponic growing media on the growth and yield of pagoda mustard greens (Brassica narinosa L.)

Production of pagoda mustard greens is currently still limited, while market demand is increasing. For this reason, it is necessary to increase the yield of pagoda mustard plants through hydroponic with optimization of nutrition and media. This study aimed to determine the plant responses to the application of AB Mix nutrient concentration and growing media types, as well as the effects of their interaction on the growth and yield of pagoda mustard greens. The research was conducted in June-July 2022 at a Screen House in Ciwidey, Bandung, at an altitude of 1,200 meters above sea level. The research used a factorial completely randomized design (CRD) with three replications. The first factor was the concentration of AB Mix nutrients 1,050; 1,150; and 1,250 ppm, and the second factor was the growing media rockwool, cocopeat, sponge, and rice husk charcoal. Data were analyzed using ANOVA and further tested using the Least Significant Difference (LSD) at the 5% level. The results showed that AB Mix nutrient with a concentration of 1,250 ppm or rockwool planting media was able to increase the growth and yield of pagoda mustard greens, but there was no interaction between the two treatment factors. Keywords: AB Mix nutrients; cocopeat; rice husk charcoal; rockwool; sponge

Influence of Nutrient Concentration on Growth, Yield And Quality of Spinach (Spinacia oleracea L.) in Hydroponic System

The present experiment entitled “Influence of nutrient concentration on Growth, Yield and Quality of Spinach (Spinacia oleracea L.) in Hydroponic system” was carried out in Shade net, Research Field, Department of Horticulture, SHUATS, Prayagraj during March- April,2020.. The experiment was laid out in complete randomized design (CRD), with eight treatments, replicated thrice with nutrient field technique hydroponics system and variety Mulayam of Spinach, the treatments were T1 (NPK 6.25 ml/plant), T2 (NPK 8.33 ml/plant), T3 (NPK 10.41 ml/plant), T4 (NPK 12.5 ml/plant), T5 (NPK 14.58 ml/plant), T6 (NPK 16.66 ml/plant), T7 (NPK 18.75 ml/plant) and T0 (NPK 0 ml/plant). From the present experimental findings, it is found that structure with treatment T4 was found best in terms of Growth and yield parameters of spinach in NFT hydroponic system followed by structure with T3 and T1 due to appropriate supply of plant nutrients and the water treated plants had the lowest values. Maximum gross return (1871.30Rs) and net return (746.30 Rs) and maximum benefit cost ratio (1.66) was also observed in treatment T4. As seen from the experiment, it was observed that the treatment T4 was ideal nutrient for Spinach good growth and yield. Therefore, an ideal nutrient concentration helps the plants in good growth and yield.

Seasonal variation of bacterioplankton community structure in Xuanwu Lake(Nanjing) and its relationship with environmental factors

应用16S rRNA基因末端限制性片段长度多态性技术和多元统计方法，探究了南京玄武湖浮游细菌群落结构的季节性变化，并找出了浮游细菌群落组成分布的主要影响因子.结果表明，玄武湖4个季节中夏季Invsimpson指数、Shannon-Wiener指数和Pielou指数最高，而春季最低.非度量多维尺度分析结果显示浮游细菌群落结构存在着明显的季节性变化.Mantel检验、典范对应分析、变量分割分析表明影响玄武湖细菌群落结构最显著的环境因子为温度，其次为pH.营养盐浓度对玄武湖细菌群落结构的影响不显著.总的来说，本研究将有助于更好地理解富营养化水体中的浮游细菌群落组成的季节变化规律.;To explore the seasonal variations of bacterioplankton community structure in Xuanwu Lake and identify the main factors affecting bacterioplankton community composition, the bacterial 16S rRNA terminal restriction fragment length polymorphism technology and multivariate statistical methods were applied. The results show that the Invsimpson, Shannon-Wiener and Pielou indexes were the highest in summer, and the lowest in spring. Nonmetric multidimensional scaling analysis showed that bacterioplankton community structure exhibited a seasonal pattern. Mantel test, canonical correlation analysis and variation partitioning analysis show that the most significant environmental factor on the bacterioplankton community structure was temperature, and followed factor was pH. The influence of nutrient concentration was not significant. Overall, this study will be helpful for better understanding of the bacterioplankton community composition in eutrophic lakes.

Influence of Nutrient Concentrations on MPN Quantification and Enrichment of Nitrate-Reducing Fe(II)-Oxidizing and Fe(III)-Reducing Bacteria from Littoral Freshwater Lake Sediments

The application of culture-dependent studies to quantify Fe-metabolizing microorganisms from the environment is a necessity, as there are so far no universal functional marker genes for application in culture-independent studies. Media composition can vary between studies, therefore, we determined the effects of three different growth media on the quantification (MPNs) and identity (via cloning and sequencing of dominant DGGE bands) of nitrate-reducing Fe(II)-oxidizers and lactate- or acetate-oxidizing Fe(III)-reducers from a lacustrine sediment: low sulphate freshwater medium (FWM), sterile filtered bicarbonate-buffered lake water (BLW) and a mixture of both (MIX). We consistently found fewer cells in the BLW than in the FWM and the MIX. The DGGE banding patterns of the microbial communities enriched in different media types clustered together according to the e− donor and acceptor couples and not according to the medium used. Thus, although the medium composition significantly influenced the quantification and thereby conclusions on the abundance and potential significance of the targeted group within the ecosystem, biodiversity assessments through enrichment cultures were less influenced by the medium, but instead were affected by the type and concentration of the e− donor/acceptor.

Population dynamics of Moina minuta Hansen (1899), Ceriodaphnia cornuta Sars (1886), and Diaphanosoma spinulosum Herbst (1967) (Crustacea: Branchiopoda) in different nutrients (N and P) concentration ranges

AIM: Aquatic environments of semi-arid regions are subject to changes in water quality and volume due to short and irregular rain seasons. Consequently, zooplankton composition changes in association to fluctuations in the trophic degree. To comprehend these processes, this study analyzed the influence of nutrient concentrations (N and P) on the population dynamics of three species of Cladocera - Moina minuta, Ceriodaphnia cornuta, and Diapahnosoma spinulosum - from the Taperoa II Dam, Paraiba, Brazil; METHODS: Animals were experimentally submitted to different nutrient concentrations as a means to reproduce specific trophic conditions from natural environments. Zooplankton densities were evaluated once every three days, with food (i.e. algal cultures) being supplied in alternate days. To compare population growth, an ANOVA was performed, followed by Tukey's HSD post-hoc test; RESULTS: The population growth of the three species differed significantly both among species and among treatments. Moina minuta populations showed higher growth rates under higher nutrient concentrations, whereas Ceriodaphnia cornuta growed more efficiently in intermediate concentrations, and Diaphanosoma spinulosum showed a better development in low nutrient concentrations; CONCLUSIONS: The results from the experimental approach, presented here, are similar to what is observed in the field, based on previous studies carried out in the Taperoa II Dam. Therefore, these results suggest that the hydrological cycle seems to be the major determinant of zooplankton population dynamics in aquatic semi-arid environments

水耕レタスの無機成分吸収に及ぼす培養液濃度の影響

1. 非結球性のレタス(サラダナ)を材料にし, NFTシステムを用いて, 無機成分吸収に及ぼす培養液濃度の影響を調査した.2. 本試験で採用した無機成分吸収量の測定方法は, イオン交換水を自動補給して, システム内の培養液を一定容量に保持しながら, 培養液濃度の低下速度から求める方法である.本システムによりレタスの無機成分吸収速度に及ぼす培養液の無機成分濃度の短期的な影響が明らかになった.3. レタスのN, P, Kは, いずれの成分の養分吸収速度も, 高濃度から1 me・liter-1程度の低濃度まで広い培養液濃度範囲で, あまり変化しなかった.つまり, レタスのN, P, K吸収速度は培養液濃度に直接的に影響されなかった.4. NH4-N濃度の低下速度は極めて速かったが, これはNH4-Nの吸収濃度比(培養液中の濃度に対するみかけの吸収濃度の比)が他の無機成分に比べて高いことが原因であると考えた.5. N, P, Kの吸収速度が培養液濃度にあまり影響されなかったことから, 養液栽培における培養液管理濃度は現状よりかなり低く設定できると考えられる.

Influence of nutrient concentration in new operating criteria for biological removal of phosphorus from wastewaters

The actual practicability of biological treatment of effluents heavily polluted by phosphoric compounds is evaluated in this paper. Preliminary batch tests have shown that high COD levels inhibit phosphorus release during anaerobic conditions but allow, at the same time, a more efficacious removal during the subsequent aerobic stage. Removal yields exceeding 60% have been calculated for an influent COD level of about 840 mg/l. The A/O process, suitably modified so as to alternate aerobic and anaerobic phases in the same reactor, has been tested for the biological removal of phosphorus in synthetic wastewaters with high phosphate concentrations. The start-up phase, carried out with a synthetic solution having a starting phosphorus concentration of 10 mg/l, showed average phosphate and COD removals of 78 and 90%, respectively. The results obtained after reaching steady-state conditions, by feeding P concentrations up to 100 mg/l, seem to indicate this process as an excellent means of reducing phosphorus emissions into the environment and therefore may contribute to the solution of eutrophication-related problems. Removals higher than 90% have been assured for wastewaters containing phosphate levels up to 70 mg/l; at higher concentrations, the system proved capable of tolerating phosphate overloading for no more than 10 days; yield then rapidly fell to zero.

The Influence of Nutrient Concentration and Zine Concentration on Cucumber Growth and Yields by Rockwool Culture

The Influence of Nutrient Concentration and Zine Concentration on Cucumber Growth and Yields by Rockwool Culture

Nutrients and phytoplankton primary production in the marine tidal Oosterschelde estuary (The Netherlands)

In a shallow marine tidal area, the eastern part of Oosterschelde estuary in the S.W. Netherlands, phytoplankton primary production amounted to 176–338 g C.m−2.y−1 during the period 1981–1985. The influence of nutrient concentrations on the phytoplankton primary production is discussed. Phosphate and inorganic nitrogen generally were amply available. Import of inorganic nitrogen into the basin was shown and an intense delivery of ammonia by zoobenthos was suggested. Nitrate was considered to be slightly influenced by phytoplankton consumption and mainly by nitrate reduction at the bottom. Silicate may have played a limiting role in phytoplankton primary production. The first phytoplankton bloom in spring (diatom bloom) always terminated when silicate concentration decreased below Ks values. Further on in 1983 and 1984 both primary production and chlorophyll curves showed a dip when silicate was not available. The influence of available light on the primary production was demonstrated during situations with a low extinction coefficient when primary production reached maximum values. Further on during 1985 the spring bloom occurred already in March when winter extinction coefficients were lower than during preceding winters. Long term production studies are necessary to understand the extreme fluctuations of annual production patterns in relation to the prevailing environmental conditions.

Influence of nutrient concentrations on the seasonal abundance and distribution of Cyanophyceae in the coastal region of Mount Cameroon

Water management in the coastal region of Mount Cameroon is threatened by extensive and persistent noxious blooms of Cyanophyceae (blue-green algae) in the surface and near-surface mesotrophic and eutrophic zones. Nutrient concentrations and species composition of Cyanophyceae were investigated from surface waters at 15 stations from three sites along the Mount Cameroon region (Mudeka Creek, Tito Creek and Idenau Beach) during the rainy season, from July to August 1999, and during the dry season, from February to March 2000. Nitrate concentrations were extremely high during the rainy season, ranging from 240.07mg l−1 to 927.07mg l−1, and comparatively low, ranging from 1.79mg l−1 to 10.39mg l−1, during the dry season The Cyanophyceae community consisted of six genera: Microcystis, Lyngbya, Gloeocapsa, Trichodesmium, Chamaesiphon and Aphanocapsa. Three species (T. dispersa, T. lacustre and L. birgei) were present during the rainy season whereas five species, with two dominant (M. aeruginosa, G. dispersa), were present during the dry season. There was a positive correlation (r = 0.73) between nutrient concentration and Cyanophyceae concentration. Water transparency depth (Secchi disc depth) was much shallower during the rainy season than during the dry season, most likely as a result of the increased leaching of insoluble material from the land and decay of Cyanophyceae blooms during the rainy season. Management strategies to limit the formation of algal blooms in the region are discussed.