2024, Vol. 7, Issue 12, Part I

author(s)
Kanade GN, Surwase SS, Kale SD, Potdar DS and Nale VN

abstract
A study was conducted on the effect of graded levels of phosphorus application on different phosphorus fractions and their effect on soil enzyme activity. In the current study different grades pf phosphorus application (T₁- 0% RDP, T₂- 50% RDP, T₃- 75% RDP, T₄- 100%, T₅-125% RDP, T₆- 150% RDP, and T₇- 175% RDP) along with recommended dose of nitrogen and potassium were applied to soybean crop grown in phosphorus deficient vertisol. From above investigation it was found that order of phosphorus fraction was Ca-P > Org-P > Red-P > Sal-P > Fe-P > Al-P > Occl-P. Correlation study resulted that with increasing in levels of phosphorus application there was significant and positive correlation between all the P fractions except organic-P fraction. Dehydrogenase enzyme activity increases with application of graded levels of phosphorus but, acid and alkaline phosphatase enzyme activity decreases with graded levels of phosphorus. Dehydrogenase enzyme activity shows significant and positive correlation with all the phosphorus fractions except organic-P fraction. Acid and alkaline phosphatase enzyme shows significant but negative correlation with all the phosphorus fractions except Organic-p fraction. Phosphorus availability, yield and yield contributing characters (i.e root nodules and chlorophyll content) increases with increasing levels P application.