Effect of potassium fertilization and salicylic acid on growth, yield and quality of soybean crop (Glycine max L.)

Abstract

A field experiment was carried out during the 2018 summer season in Amiriyat Al-Fallujah - Anbar Governorate that located on longitude of 43° E and latitude of 33° N to study the effect of Salicylic acid and Potassium fertilizers in the growth , yield and quality of soybean crop. Four concentrations of Salicylic acid (0, 75, 150 and 225 mg.L-1). Potassium fertilizer was used at three levels (0, 100 and 200 kg. ha-1) (41% K2SO4). The experiment was applied according to the Split Plot design according to the design )RCBD( with three replications. Salicylic acid concentrations were applied in the main plots. Potassium fertilization treatments were applied in secondary plots. Soybean seeds were grown in senaiah 2 variety. The results showed a significant effect of salicylic acid concentrations, where the concentration 225 mg.L-1 of salicylic acid exceeded by giving it the highest average for plant height, number of branches, plant dry weight, number of pods and total yield, while concentration 150 mg.L-1 exceeded in leaf area (3299 cm2.plant-1) and 100-seeds weight (12.04 g). Potassium fertilization at high level 200 kg ha-1 also resulted to improved the vegetative growth traits (plant height, number of branches, leaf area and dry weight of plant). And the yield and components (number of pods per plant, number of seeds per pod and total yield). The interaction between the factors of the study took the behavior of individual factors in their effect on most of the studied traits. The positive effect was in the treatment of the interaction between the high concentration of salicylic 225 mg L1- and the high level of potassium 200 kg.ha-1, gave the highest average of the number of pods in plant 162.27 pod.plant-1).