Effect of phosphocompost on rice-wheat system in a non-calcareous typic haplustept

• Published in: Journal of the Indian Society of Soil Science
• Main Authors: Singh, J, Rani, N, Sidhu, B.S, Beri, V
• Format: Journal Article
• Language: English
• Published: 01.09.2009
• Subjects: ARROZ; BLE; CIENCIA DEL SUELO; COMPOSE ORGANIQUE; COMPUESTOS ORGANICOS; CROPPING SYSTEMS; FOSFORO; http://www.fao.org/aos/agrovoc#c_1971; http://www.fao.org/aos/agrovoc#c_5384; http://www.fao.org/aos/agrovoc#c_5804; http://www.fao.org/aos/agrovoc#c_6599; http://www.fao.org/aos/agrovoc#c_7188; http://www.fao.org/aos/agrovoc#c_8373; ORGANIC COMPOUNDS; PHOSPHORE; PHOSPHORUS; RICE; RIZ; SCIENCES DU SOL; SISTEMAS DE CULTIVO; SOIL SCIENCES; SYSTEME DE CULTURE; TRIGO; WHEATS
• ISSN: 0019-638X

Utilization of rock phosphate through phosphocompost in rice-wheat system was investigated in a field experiment. Application of phosphorus (P) in the form of phosphocompost and inorganic fertilizers at various doses was repeated for five rice-wheat cycles on a coarse loam noncalcarous Typic Haplustept. Higher grain yield (7.41 t ha-I) of rice was obtained in the treatment receiving half of the recommended level of inorganic P in combination with 2 tonnes (t) of phospho compost ha-1 (N120P13V2), Maximum wheat grain yield of 5.41 t ha-I was obtained in treatment receiving recommended dose of fertilizers along with 2 t phosphocompost ha-1 (N12oP26 V 2)' The relative yield of rice and wheat was 110 and 104;, respectively in the treatment receiving 2 t ha-I of phosphocompost to each rice and wheat along with inorganic fertilizers (N 120P26 V 2)' The addition of 2 tonnes of phosphocompost each to rice and wheat saved 13 kg P20s ha-1 in wheat and 60 kg N ha-1 in rice. Each cycle of rice-wheat removed 20.2 kg and 42 kg P ha-I (average of five crop cycles) in control and N120P26 V2 treatments, respectively. Each tonne of rice and wheat grain removed 3.19 to 3.25 and 3.36 to 3.50 kg P, respectively. Phosphorus uptake, recovery efficiency, physiological efficiency, agronomic efficiency and recovery of P from compost were higher in rice than in wheat. The Olsen-P and other fractions of P in the soil increased over control in treatments where phosphocompost was added. Olsen-P determined after five cycles correlated positively with total P addition (r = 0.867***) and different fractions i.e. saloid-P (r= 0.970***), Fe-B(r = 0.937***), AI-P (r = 0.964***) and Ca-P (r = 0.702*). Activity of the alkaline phosphatase enzyme increased with phosphocompost incorporation.