Investigating of N and K Fertilizers on Yield and Components of Soybean (Glycine max (L.) Merr.)

Abstract

Nitrogen and potassium fertilization have given variable results in increasing soybean yield. More information is needed about optimum potassium (K) and nitrogen (N) fertilizers placement for soybean. This study investigated the effect of different amounts of nitrogen and potassium on yield and its components on soybean cultivar DPX. Treatments include nitrogen (from urea) -Potash (potassium sulfate) in seven levels (N0-K0, N50-K0, N0-K20, N50-K20, N100-K50, N200-K100 and N250-K150 kg/ha) and factor inoculated and non-inoculated at two levels. Some growth parameters such as seed number, 100 seed weight, pod number, yield and harvest index were analyzed. There was significant difference between seed number and 100 seed weight. When the seeds were inoculated with bacteria, treatments N0-K0 and N250-K150 have a minimum and maximum number of seeds in these conditions, respectively. Also, the results showed that 100 seed weight in treatments inoculated with bacteria, N250-K150 most (24 g per plant) and N0-K0 minimal (14 g per plant), respectively. In the absence of inoculation with bacteria treated N0-K0 also had the lowest 100 seed weight. There was a positive correlation between number of pod per plant, yield and harvest index and N rate. Consequently the results demonstrated that increases in yields were necessarily related to increase in plant N and K content and inoculated with bacteria had a marginal effect.

Effects of blended polyvinyl alcohol/urea on the growth, yield and chemical content of tomato (Lycopersicon esculentum L. Mill)

“…Nitrogen is the most important nutrient for the synthesis of proteins and the enhancement nutrient content in the leaves of plant including nitrogen and potassium content [18]. The obtained data was in accordance with those previously reported by authors [51,52] who reported that N-fertilizer increased the leaf nitrogen concentration.…”

Agronomic Responses of Soybean Genotypes to Starter Nitrogen Fertilizer Rate

“…This suggests that yield components (NN, NP, SWP and TSW) are significant factors that contribute to the expression of SY potential. Several researchers, Boroomandan et al [10], Showkat and Tyagi [34] and Shahkoohmahally and Shahkoohmahally [35] found a positive and significant correlation between SY and NP and SY and TSW. What is the more negative but non-significant relationship between PC and OC indicates the opposite trend of the protein and oil accumulation in response to the increased N rate.…”

Analysing the water and greenhouse gas effects of soya bean‐based biodiesel in five different regions

“…The reason for the high fertilizer application rates is unclear, but it can be caused by lack of knowledge among farmers or improper methods in applying fertilizers (Sheikh Davoodi & Houshyar, 2009). In Iran, research suggests that soya bean yields keep increasing at rates of nitrogen application even higher than the ones used here (Shahkoohmahally & Shahkoohmahally, 2017). This combined with the fact that fertilizers are subsidized in Iran (FAO, 2005) may suggest that a high fertilizer rate is a local economic optimum.…”