Effect of Organic Manures and Phosphorus on Soil Nutrient Status in Kharif Rice
I. Jagga Rao *
KBR College of Agriculture, C.S Puram, Prakasam (Dt) - 523112, India.
Ch. Sujani Rao
Department of Soil Science, Technical Team of Subject Expert, Integrated Call Centre, Gannavaram, Vijayawada-521101, India.
P. R. K. Prasad
Department of Soil Science, ANGRAU, Lam, Guntur, Andhra Pradesh-522034, India.
Ch. Pulla Rao
Department of Agronomy, Agricultural College, Bapatla-522101, India.
K. Jayalalitha
Department of Crop Physiology, ANGRAU, Lam, Guntur, Andhra Pradesh-522034, India.
*Author to whom correspondence should be addressed.
Abstract
Field experiments were conducted at Agricultural College Farm, Bapatla during Kharif and Rabi seasons of 2017-2018 and 2018-2019 to study the Phosphorus dynamics in relation to nutrient management in rice- blackgram cropping sequence with respect to changes in soil nutrient status. Results of two years (2017-2019) experimentation revealed that at all growth stages of rice, significantly highest available nitrogen, phosphorus and potassium in soil were recorded with application of RDNK+Dhaincha @ 10t ha-1 (M3) and this was on par with RDNK+ Sunhemp @ 10t ha-1(M2), whereas lowest was recorded in RDNK (M0) alone in both seasons of study. Among the P levels the available nutrient status (N, P and K) were increased with the increasing level of P from 0 (P1) to 120 kg P2O5 (P5) ha-1, irrespective of the nutrients imposed to rice crop. Significantly highest was recorded in P5 (120 kg P2O5 ha-1) and this was on par with P4 (90 kg P2O5 ha-1), whereas the lowest was recorded in treatment P1 that received 0 kg P2O5 ha-1.
Keywords: Organic manures, phosphorus fertilizer, soil nutrient status, kharif rice