Author(s):

M Venkata Lakshmi, Ch Pulla Rao, PVN Prasad, P Prasuna Rani and Y Ashoka Rani

Abstract: A field experiment was conducted during Kharif 2016-17 and 2017-18 respectively on sandy loam soils of the Agricultural College Farm, Bapatla to study the yield, nutrient content and nutrient uptake of groundnut as influenced by phosphorus management practices in rice-groundnut sequence. The experiment was laid out in a Split-split plot design in rabi groundnut and the treatments were replicated thrice. The treatments consisted of four main plots residual effect of Kharif sources and levels of phosphorus S₁ : Inorganic fertilizer phosphorus through SSP, S₂ : Green manuring in-situ with dhaincha @ 25 kg seed ha^-1, S₃ : Biofertilizer (PSB) @ 750 ml ha^-1, S₄ : Green manuring in-situ with dhaincha @ 25 kg seed ha^-1 + Biofertilizer (PSB) @ 750 ml ha^-1 and three subplots levels of phosphorus L₁ : 50% Recommended dose of P_, L₂ : 100% Recommended dose of P and L₃ : 150% Recommended dose of P. Each of the Kharif sub plot was divided into three sub-sub plots during rabi season with groundnut crop and total thirty six treatments were laid out in a Split-split design. Results of the experiment showed that residual sources and levels of phosphorus to preceeding rice crop i.e., in-situ green manuring + PSB showed superior performance in terms of yield, nutrient content and nutrient uptake such as nitrogen, phosphorus and potassium uptake of groundnut but was on a par with that of application of in-situ green manuring and significantly superior over inorganic fertilizer through SSP and biofertilizer (PSB) alone during both the years and pooled data of study. During rabi treatments among the doses of phosphorus 100 % RDP showed significantly higher yield, nutrient content and nutrient uptake of groundnut and it was on a par with 50 % RDP over control during both the years and pooled data.

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