Integrated management of green leaf, compost, crop-residues and inorganic fertilizers in rice (Oryza sativa)-rice system
2000
Raju, R.A. | Reddy, M.N. (Acharya N.G. Ranga Agricultural University, Maruteru (India). Agricultural Research Station)
A field experiment was carried out in both rainy and winter seasons during 1992-98 at Maruteru, Andhra Pradesh, to find out the effect of integrated nutrient supply system in rice (Oryza sativa L.)-rice system of coastal ecosystem. The highest (121.1 q/ha) system productivity was obtained with the use of sesbania green leaf to substitute 50 NPK need. All organics in conjunction with inorganic fertilizers were superior to sole chemical fertilization in terms of agronomic efficiency. Green-Ieaf manuring with sesbania resulted in the maximum energy output (170, 079 MJ/ha) and with lesser energy (8,292 MJ/ha) involvement and resulted in the highest energy ratio (19 : 5). When half of the NPK was substituted through green leaf manure, there was maximum' uptake of NPK and a low negative N balance. Phosphorus balance was positive in all treatments and its accumulation was particularly high when large amounts of compost, green-manure, and rice straw were incorporated. The pH values of all treatments declined after 6 years of continuous rice cropping. Organic carbon status declined in the control and among the normal fertilized plots, more organic carbon was present in straw-incorporated plots. Potassium values were remarkably augmented in all organic fertilized plots but more conspicuous in straw-applied treatments.
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