INFLUENCE OF CONJUCTIVE USE OF ORGANIC AND INORGANIC SOURCE OF NUTRIENTS IN RICE (ORYZA SATIVA) ON CROP GROWTH, YIELD COMPONENTS, YIELD AND SOIL FERTILITY IN RICE-SUNFLOWER (HELIANTHUS ANNUUS) SEQUENCES. Krishnaprabu
A field experiment was carried out during 2017 at Experimental Farm, Annamalai University to study the effect of conjunctive use of nutrients in rice on rice (Oryza sativa L.) â sunflower (Helianthus annuus L.) cropping system. Rice fertilized with 75% recommended level of 120 kg N/ha and supplemented with 25% N through organic sources removed more N, P and K from the soil and gave significantly more seed yield (39.57 q/ha) than by the application of N through the fertilizer alone. The yield was increased to 43.67 and 42.91 q/ha by substituting 25% N through the bulky organic manure of FYM and vermicompost. The substitution of 25% N through green leaf manures, viz. Gliricidia and sunnhemp, increased the production to 41.83 and 43.90 q/ha. Plant height, capitulum diameter, filled seeds/capitulim and seed yield of sunflower were significantly reduced by reducing the level of fertilizers to 75 or 50% of the recommended level of 80, 50 and 30 kg/ha NPK. The crop gave mean seed yield of 8.18 q/ha with the recommended level of 120 kg N/ha to preceding rice through the fertilizer. But the residual fertility of nutrients by the application of 75% N through fertilizer and rest through FYM or vermicompost to rice significantly increased the seed yield of sunflower to 9.23 and 9.14 q/ha respectively. Substitution of 25% N through Gliricidia or sunnhemp to rice also significantly increased the seed yield of succeeding sunflower to 8.82 and 8.70 q/ha. The soil-available N, P and K were also more by the conjunctive source of fertilizer and organic manures applied to rice in rice-sunflower cropping system compared to the initial values.
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