Residual effect of applied Zinc, Boron and phosphorus on post-harvest nutrient availability status of soil

A screen house experiment was conducted on green gram to determine the effect of zinc (Zn), boron (B) and phosphorus (P) on post-harvest analysis of the soil. The plants were raised in pots having 4 kg of light textured soil (sand). In each pot four level of boron (0, 0.25, 0.5 and 1.0 mg kg-1) along with four level of zinc (0, 5, 10 and 15 mg kg-1) and in second set same four level of boron with five level of phosphorus (0, 25, 50, 75 and 100 mg P2O5 kg-1 soil) were applied with three replication. The results showed that with each graded level of boron application soil boron and phosphorus concentration increased and zinc concentration decreased. Similarly, application of phosphorus increased the availability of soil boron and phosphorus concentration and decreased zinc concentration whereas, zinc showed negative relation with these two nutrients and decreased their availability in soil.