Response of Seed Yield, Its Components, Chlorophyll Content and Proline Concentration of Mung bean (Vigna radiate L.) To Apply Sulphate Potassium Fertilizer under Salinity Stress Situation

BACKGROUND: Among the environmental stresses soil salinity is a widespread environmental problem that has been found to affect more than 77 million hectares or 5% of the cultivable land of the universe. Potassium has a positive role in plant growth under saline conditions, because this element plays an essential role in photosynthesis, osmo regulatory adaptations of plant to water stress. OBJECTIVES: Current research was carried out to evaluate effect of different level of potassium and salinity stress on quantitative and qualitative traits of Mung bean. METHODS: This study was conducted according factorial experiment based on completely randomized design with three replications along 2015 year. The treatments included potassium fertilizer (0, 100 and 200 kg.ha-1) from sulphate potassium source and four level of salinity (0, 2, 4 and 6 ds.m-1). RESULT: Result of analysis of variance showed effect of different level of salinity stress and potassium fertilizer on all studied traits were significant. Evaluation mean comparison result of interaction effect of treatments indicated maximum amount of seed and biologic yield (15.20 and 39.40 gr.plant-1) was noted for control and 200 kg.ha-1 potassium fertilizer and lowest ones (6.86 and 24.60 gr.plant-1) belonged to 6 ds.m-1 salinity stress and control treatment. Increasing salinity level led to decrease measured traits (instead proline concentration) but increasing potassium fertilizer level led to improve seed yield and its components. CONCLUSION: Application the treatment of 4 ds.m-1 and 100 kg.ha-1 potassium fertilizer was able to prevent the reduction of Mung bean crop production, which was not significantly different from the treatment of 200 kg.ha-1.