FERTILIZER PRESCRIPTIONS UNDER STCR -IPNS FOR HYBRID MAIZE IN INCEPTISOL (VERTIC USTROPEPT)
The field experiment was conducted to refine the fertiliser prescription equation for hybrid maize on an Inceptisol (Periyenackampalayam soil series- Vertic Ustropept), conducted at farmer’s holding of Allapalayam village, Annur block, Coimbatore District of Tamil Nadu in Western Zone of Tamil Nadu during Rabi 2015-16. Inceptisol. The soil of experimental field was sandy clay loam with alkaline pH and non-saline in nature. The soil was low in organic carbon and available N, medium in available P and high in available K. The available Zn, Cu, Fe, and Mn were in sufficient status. Basic parameters were calculated from the data generated from the field experiment. Using the basic parameters, crop nutrient requirement per quintal of grain production, contribution of soil available nutrients, contribution of fertilizer nutrients and contribution of farm yard manure were worked out. It was found that hybrid maize requires 1.76, 0.58 and 1.62 kg of N, P2O5 and K2O per quintal of grain produced. Using the basic parameters, fertiliser prescription equations were developed based on integrated plant nutrition system (IPNS). It was estimated that, application of FYM @ 12.5 t ha-1 with 28% moisture, 0.53%, 0.26% and 0.50% of N, P and K, respectively along with NPK fertilizers, the extent of saving inorganic fertiliser for hybrid maize was 40, 20 and 30 kg of fertiliser N, P2O5 and K2O, respectively. So, that integrated use of organic manure and chemical fertilizers is beneficial in improving crop yield and uptake by maize hybrid. Thus to maintain consistent soil fertility with high rate of productivity soil test based fertiliser recommendation along with integrated nutrient management will benefit the farmer in saving of fertilizer and sustaining soil health.
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