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Contribution of crop residues to yield and nutrient uptake of irrigated rice (Oryza sativa) in rice-rice cropping system



Contribution of crop residues to yield and nutrient uptake of irrigated rice (Oryza sativa) in rice-rice cropping system



Indian Journal of Agricultural Sciences 75(7): 392-395



A field experiment was conducted in Hyderabad, Andhra Pradesh, India, during 1998-2000 on a sandy clay loam soil (deep Aquic Ustorthent) for 5 consecutive seasons (3 wet of 1998, 1999 and 2000 and 2 dry of 1999 and 2000) under 5 treatments, i.e. 100% straw incorporation (T1); 50% straw incorporation (T2); 100% straw+green manure incorporation (T3); 100% straw burning (T4), and straw removal (T5), to evaluate the effect of different crop residue management practices on grain and straw yields and major nutrient (N, P, and K) uptake by rice in a rice-rice cropping sequence. Grain yields of rice were significantly influenced by the different crop residue management practices from the third season of residue incorporation, while the nutrient uptake was influenced from the second season onwards. During the wet season of 2000, 11-26% increase in grain yield owing to crop residue management was observed, with the maximum value in T3. During the dry season of 2000, the increase was 15-19%, the maximum being under T4. The wet season added T3 showed significant residual effect on the yield (17% more) and nutrient uptake (35, 55 and 37% for N, P and K, respectively) of the dry season rice. The increased nutrient uptake resulted in significant increase (0.34-0.82 and 0.98-1.18 t/ha in the wet and dry seasons, respectively) in rice productivity, which was clear from the correlation between grain yield and nutrient uptake (r=0.65**-0.91** and r=0.55*-0.96** during the wet and dry seasons, respectively). Incorporation of rice straw either alone or in combination with green manure and straw burning increased the yields (0.56-1.08 t/ha) through improved nutrient uptake.

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