Effect of Zinc Fertilization on Zinc Transformations and Yield of Blakgram Grown in Inceptisols: A Case Study from India

A field experiment was conducted to study the effect of zinc fertilization on zinc transformation under blakgram crop grown on Inceptisols at Agricultural College Farm, Bapatla during Rabi, 2021. The experiment was laid out in a split plot design with three main treatments of zinc levels application (0, 25 and 50 kg Zn ha-1) and five sub treatments of blackgram varieties (LBG 752, LBG 787, TBG 104, GBG 1 and PU 31) replicated three times. The various Zn fractions viz., water soluble plus exchangeable Zn (WS+EX-Zn), organically complexed Zn(OCX-Zn), amorphous sesquioxide bound Zn(AMOX-Zn), crystalline sesquioxide bound Zn(CRYOX-Zn), residual Zn(Res-Zn) and total Zn were studied during different (pod development and harvest) stages of the crop. The results of experiment showed that the WS+EX-Zn, OCX-Zn, AMOX-Zn and CRYOX-Zncontent in soil significantly increased with increased levels of Zn application. Residual Zn was dominant fraction among all zinc fraction. Further, the concentration of WS+EX-Zn and OCX-Zn of soil significantly enhanced the yield of blackgram.