Split Application Of Potassium Research Articles

Growth and yield variability of wheat as effected by split application of potassium and nitrogen

Growth and yield variability of wheat as effected by split application of potassium and nitrogen

Agronomic Performances of a Rice Somaclone (RSC2018-1) with Potassium Split Applications

RSC2018-1 is a rice somaclonal line derived from the local aromatic rice cultivar 'Benapole' with a substantially smaller grain size than the mother cultivar. During final field preparation, potassium fertilizer is typically applied in a single dose; however, several scientists have found that split doses of potassium are beneficial for increasing rice grain yield. Thus, the current study aims to assess the impact of potassium split treatments on yield and yield attributes of the rice somaclone RSC2018-1. The experiment was conducted at the experimental Field of Agrotechnology Discipline Khulna University (Southwestern Bangladesh) using a Randomized Complete Block Design (RCBD) with seven treatments and three replications. The treatments were T1 ( K: 41 kg ha-1 basal, RDK) (control), T2 (K: 50% RDK, basal), T3 (K: 75% RDK basal and 25% RDK 45 DAT), T4 (K: 50% RDK basal and 50% RDK 45 DAT), T5 (K: 25% RDK basal and 75% RDK 45 DAT), T6 (K: 25% RDK basal, 25% RDK 15 DAT and 50% RDK 45 DAT), T7 (K: 50% RDK basal; 25% RDK 15 DAT and 25% RDK 45 DAT). Various data on growth and yield attributes were recorded and statistically analyzed for ANOVA and the means were compared by Tukey’s test with the software Statistix10. The experimental results revealed that the split application of potassium was not very helpful for most of the parameters studied including grain yield and half of the recommended dose of potassium (T2) showed similar results to the recommended dose (T1) and the other treatments except T5. Thus it is recommended to apply potassium @ 20.5 kg ha-1 (T2: 50% RDF, basal) at the final land preparation for the rice somaclone RSC2018-1.

Split application of varying potassium (K) rates influence wheat yield and K use efficiency

Potassium (K) application during land preparation doesn’t meet the crop requirement as huge amount of K is lost. Moreover, dose also should be optimized considering land, soil and variety. Therefore, a field experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, to explore the influence of different management levels of K on yield and potassium use efficiency of wheat. Two wheat varieties (BARI Gom-27 and BARI Gom-33) and nine potassium (K) management levels [K0 = 0 kg K ha-1, K1 = 40 kg K ha-1 (full as basal), K2 =40 kg K ha-1 (half as basal and half at active tillering stage), K3 = 60 kg K ha-1 (full as basal), K4 = 60 kg K ha-1 (half as basal and half at active tillering stage), K5 = 80 kg K ha-1 (full as basal), K6 = 80 kg K ha-1 (half as basal and half at active tillering stage), K7 =100 kg K ha-1 (full as basal), K8 = 100 kg K ha-1 (half as basal and half at active tillering stage)] were used as treatments. The results of potassium management levels revealed that yield and yield components of wheat except straw yield were increased with the split application of potassium (K) (half as basal + half at active tillering stage) at 80 kg ha-1 and decreased with no potassium (K) application. The highest grain yield (4.37 t ha-1) was obtained from 80 kg K ha-1 applied as split which was 69.37% higher than the control. The potassium agronomic efficiency (5.50%) and apparent potassium recovery efficiency (29.17 kg kg-1) were highest in the treatment application of potassium at 40 kg ha-1 (half as basal and half at active tillering stage) grown with BARI Gom-33. In split application and 80 kg K ha-1 condition BARI Gom-33 gave the highest grain yield (4.77 t ha-1). Therefore, it may be concluded that the application of 80 kg K ha-1 as split (half as basal and half at active tillering stage) may be followed to achieve higher yield in wheat cultivation.

Interactive effects of potassium and saline water on yield, nutrient accumulation and uptake by rice

A pot culture experiment was conducted to assess the interaction effects of salinity and potassium nutrition on rice during 2018.A pot experiment was conducted in CRD with three replications and twelve treatments consist of four levels of saline water (0, 2, 4 and 8 dS m-1) and three doses of potassium (60, 120 and 180 kg ha-1). The crop received a common dose of N @ 120 kg ha-1 (in splits) and P @ 60 kg ha-1. The crop received saline water irrigation up-to saturation point at 30, 45, 60 and 80 DAP (days after planting). The study indicated that the cumulative application of saline water @ 4 and 8 dS m-1 decreased the grain yield and straw yield, yield components, potassium content and uptake by rice whereas, sodium content and uptake increased significantly at higher level of salinity (4 and 8 dS m-1). The adverse effect of Na was reduced with application of potassium. The grain and straw yield, yield component, potassium content and uptake by rice was increased with increasing the dose of potassium. The sodium content and uptake by rice was reduced significantly with higher dose of potassium (180 kg ha-1) application. Based on the present study, split application of potassium @ 180 kg ha-1 is recommended for rice in saline soil. The K+/Na+ ratio in soil and plant can be considered as a best indicator in evaluating crop performance in saline soil.

Energy budgeting of aerobic rice (Oriza sativa)-wheat (Triticum aestivum) cropping system as influenced by potassium fertilization

A field experiment was conducted in 2015–16 and 2016–17 to estimate the energy budget of aerobic rice (Oriza sativa L.)-wheat (Triticum aestivum L.) cropping system (RWCS) as influenced by K fertilization. Results revealed that in aerobic RWCS the non-renewable energy and renewable energy shares 86% and 14% of the total input energy use respectively. Split application of recommended dose of K (RDK=60 kg K2O/ha) in both rice and wheat, at 50:50 or 75:25 ratio increased the system productivity by 8.2% over applying entire dose as basal (B). Among the treatments, T12 (150% RDK as basal) recorded the highest energy input (37481.5 MJ/ha), whereas T1 (control) recorded the lowest (35474.5 MJ/ha). Treatments T11 [75% RDK as basal + 25% at panicle initiation (PI) or ear initiation (EI)+ 2 foliar spray of 2.5% KNO3] recorded the highest output energy (340 ×103 MJ/ha) which remained at par with T4 [50% RDK as basal + 50% at panicle initiation (PI) or ear initiation (EI)], whereas the lowest was recorded in control (275.9 ×103 MJ/ha). Two split application of 60 kg K2O/ha at 50:50 ratio increased the system energy output by 5.5% and 13.5% over T2 (100% RDK as basal) and T3 (50% RDK as basal) respectively. Similarly, split application of potassium under T4 treatments increased the system energy use efficiency, energy productivity and energy profitability by 17.9%, 25% and 20.5% respectively over control. Thus in aerobic RWCS, 4R (right time, right dose, right method, right form) stewardship based K application ensure efficient utilization of input energy and maximize the production of biological energy.

Effect of split application of potassium on yield and yield attributes of Soybean [Glycine max (L.) Merrill

A field experiment was conducted at Punjab Agricultural University, Regional Research Station, Gurdaspur (Punjab) during kharif 2016-17, to study the effect of split application of potassium on yield and yield attributes of soybean. The experiment was conducted in randomized complete block design with seven treatments applied at sowing and as split application of potassiumT1: Recommended fertilizer dose (12.5 kg N, 32 kg P2O5and no potassium application) , T2: 15 kg K2O ha-1(at sowing), T3: 30 kg K2O ha-1(at sowing), T4:60 kg K2O ha-1(at sowing), T5: 7.5 kg K2O ha-1 (at sowing) + 7.5 kg K2O ha-1 (at flowering), T6: 15 kg K2O ha-1(at sowing) +15 kg K2O ha-1(at flowering), T7: 30 kg K2O ha-1(at sowing) +30 kg K2O ha-1(at flowering). Results revealed that significantly higher grain yield (25.2 q ha-1) was obtained in T7 (30 kg K2O ha-1 (at sowing) + 30 kg K2O ha-1 (at flowering) as compared to all other treatments but it was statistically at par with the split application of potassium @ 15 kg K2O ha-1 (at sowing) + 15 kg K2O ha-1 (at flowering) (T6) with grain yield of (22.6 q ha-1). Split application of potassium significantly increased soybean grain yield over the basal application with highest benefit cost ratio (7.1). Among the split application of potassium, grain yield of soybean was increased significantly by 15.6 % in T7 treatment over T5. Split application of potassium was more beneficial than applying full dose of potassium at the time of sowing due to higher number of pods and pod weight plant-1.

Response of transplanted aman rice varieties to split application of potassium

The research was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, to investigate the effect of time of split application of potassium on the yield of three transplanted (T) aman rice varieties. Rice varieties were BRRI dhan39, BRRI dhan40 and BRRI dhan41. Potassium was applied at the rate of 80 kg K ha-1. Experimental plot size was 5m2 (2.5m ×2.0m). Four split application of potassium [K1= Control (No K application), K2= 40 g K plot-1 at 15 DAT (days after transplanting), K3= 20 g K plot-1 at15 DAT+20 g K plot-1 at 30DAT, K4= 10 g K plot-1 at 15 DAT+ 10 g K plot-1 at 25DAT+ 10 g K plot-1 at 30 DAT+ 10 g K plot-1 at 45 DAT] were considered as treatments. From the experiment it was found that split application of potassium had no significant effect on plant height, length of panicle, thousand grains weight. It was evident that two splits application of potassium i.e., 20 g K plot-1 at 15 DAT+20 g K plot-1 at 30 DAT with BRRI dhan41 gave maximum no. of tiller hill-1, effective tiller hill-1, grains panicle-1, grain yield and straw yield, biological yield and harvest index. But varieties differed among themselves in terms of yield contributing characters and yield, and BRRI dhan41 performed the best. Therefore, based on the findings of the present study, it may be concluded that for obtaining higher yield BRRI dhan 41 can be grown following application of potassium at the rate of 80 kg ha-1 in two equal split at 15 and 30 days after transplanting
 Res. Agric., Livest. Fish.5(3): 313-320, December 2018

The split application of potassium influence the production, nutrients extraction, and quality of sweet potatoes

The current study aimed to evaluate the effect of split application of potassium (K) fertilizer on the production and quality of sweet potatoes. Ten treatments were evaluated in factorial design (3 × 3 + 1): three doses of potassium (60, 90, and 120 kg K2O ha−1); three application types (100% applied at planting; 50% applied at planting and 50% was given as topdressing; 25% applied at planting and 75% was given as topdressing) and one control (without the application of K2O either at planting or topdressing). The experiment used a randomized complete block design and four repetitions. The following parameters were studied: root number; root fresh matter per plant; total dry matter; yield; total macronutrient extraction; sugar content of starch; and commercial starch. The production characteristics of the roots presented a significant interaction between the factors doses of potassium and application types (parcelaments). Finally, better results were obtained when potassium was applied 50% at planting and 50% as topdressing.

Response of Rice (Oryza sativa L) to Split Application of Potassium in Old Brahmaputra Flood Plain Soil

Not available DOI: http://dx.doi.org/10.3329/bjar.v37i1.11192 Bangladesh J. Agril. Res. 37(1): 179-184, March 2012

Effect of nitrogen and split doses of potassium on quality aspects of Brassica species

Field experiments were conducted on three different Brassica spp. (Brassica juncea, Brassica carinata and Brassica nupus) with three levels of nitrogen (40, 80 and 120 kg of N ha-1) and 2 methods of time of potassium application at 80 kg ha-1 ((i) 100% basal and (ii) 50% basal + 50% at the time of 1st irrigation), during Rabi season of 2003 - 2004 and 2004 - 2005 showed that Brassica spp. responded significantly to the application of N and K. Maximum oil yield was observed in case of B. carinata (PBC-9221) and minimum under B. napus. Higher dose of nitrogen 120 kg N ha-1 produced maximum oil yield. Split application of potassium also produced higher oil yield than basal dose of potassium. Key words: Brassica, nitrogen, potassium.

Split application of muriate of potash and sulphate of potash on growth, yield attributes, uptake and availability of nutrients in lowland rice CV. PY-5

Field experiments were conducted in Typic Chromusterts of the experimental farm of the Annamalai University, Tamil Nadu, India to study the split application vis-a-vis customary full dose/basal application of different Potassic fertilizers viz: muriate of potash (MOP) and sulphate of potash (SOP) on rice. The soil was low in available N, medium in available P, high in available K and low in available S. Results showed that split application of potassium was found to be better than entire basal application. Application of 50 per cent K2O each at tillering and panicle initiation stages increased the growth and yield attributes of rice and N, P, K and S uptake. Similarly it has a positive impact on available potassium and sulphur. However, available nitrogen and phosphorus was higher in treatment where the entire application of K was done as basal. Among the sources tried, MOP was superior to SOP.

Split application of potassium on rice (Oryza saliva) in coastal zone of West Bengal

A field experiment was conducted to study the responseof 2 h i i d i n g rice . (OgmsafiwaL) of different varieties, IET 1444 (Rasi) and IET 4094 (Khii) duration, to split application of potassium vis-a-vis customary full dose of 60 kg &Oha as basal duringtherainy season of 1997 and 1998 on silty day soils. Split application of potassium was significantly superior, giving up to 14.47% higher yield to its application only as basal dose. An additional return up to Rs 501.08/ha was obtained from the diierent treatments consistingof diierent time of potassium application, the most economic treatment being the one, where half of the potassium was applied at transplanting and remaining half either at panicle-initiation stage (var. IET 1444) or in2 equal splits at tillering and panicle- initiation stage (var. IET 4094) synchronizing with 1 split dose of nitrogen. Key words : Rice, Split application, K, Economics

Effect of split application of potassium on growth, yield and potassium accumulation by soybean

Field experiments were conducted during 1989 to 1991 on a loamy sand (Typic ustochrept) soil to study the K nutrition of soybean. Soybean responded significantly up to 50 kg K ha−1 when applied 1/2 of K at planting and 1/2 at flower initiation (two split) or applying 1/3 K at planting, 1/3 at flower initiation and 1/3 at pod development (three splits). Split application was more beneficial than applying full K at time of planting due to higher leaf area index, crop growth rate, chlorophyll content of fresh leaves, K accumulation in soybean and better agronomic and physiological efficiency of applied K. Agronomic efficiency, physiological efficiency and apparent recovery of K reduced as rate of applied K was increased from 50 to 75 kg ha−1. Highest K+ concentration (3.4 % of dry matter) was recorded in 30-day-old plants at 75 kg K ha−1 which depressed progressively with the age of the crop. At maturity, the K concentration of soybean seed varied from 1.5% (unfertilised K plants) to 2.1 % (when 75 kg K ha−1 was applied in three splits).