Abstract
A two year study was conducted to investigate soil nutrient dynamics influenced by various legumes (Sesbania,
Cluster bean, Rice bean) and different P levels (0, 30, 60, 90 kg P20S ha'). Effect of incorporating green manure
crops and P levels on NPK content of soil differed among various treatments. Sesbania caused an increase of
about 26, 18 and 37% N, P and K, respectively, followed by Cluster bean i.e., 21, 12 and 29% in soil, respectively,
over control. The percent increase in soil NPK by Rice bean over control was the lowest i.e., 16, 11 and 23%,
respectively. The influence of P levels on soil NPK was also considerable and was maximum with 90 kg P20S ha
1. On an average, the overall effect of P application on NPK status of soil was an increase of 5, 6 and 3%,
respectively, over control.
Key words: Legume crops, P application, NPK status of soil, rainfed conditions, Pakistan
