Winner of SADHNA Best Paper Award 2021 Soil test crop response-based fertilizer prescriptions under integrated plant nutrient supply for maize-wheat cropping system in Inceptisols Singh SP*, Patel Chanchala Rani ICAR-Krishi Vigyan Kendra (IGKV), Bilaspur-495001, Chhattisgarh, India *Email for correspondence: spsinghsahab@gmail.com
Online published on 6 December, 2021. Abstract Field experiments were carried out to investigate the soil test crop response-based fertilizer prescriptions under integrated plant nutrient supply by following Ramamoorthy's inductive approach of fertility gradients in Inceptisols at the instructional farm of Krishi Vigyan Kendra, Raigarh, Chhattisgarh on maize (Zea mays L) and wheat (Triticum aestivum L) during kharif and rabi 2016–17 with well developed fertility gradients. The nutrient requirement, contribution of nutrients from soil, fertilizer and farmyard manure were computed using the data on soil test values, fertilizer nutrient doses, nutrient uptake and maize and wheat yields. The amount of nutrients required to produce one quintal of maize grain was found to be 1.59 kg N, 0.32 kg P and 1.84 kg K. Similarly 2.02 kg N, 0.56 kg P and 2.12 kg K were required for producing one quintal of wheat grain. The contribution from fertilizer for N, P and K was estimated 41.84, 28.28 and 140.33 per cent and 29.03, 18.79 and 74.74 per cent for maize and wheat crops respectively. The per cent contribution from soil was recorded as 22.53 for N, 52.67 for P and 26.40 for K in case of maize and 10.00 for N, 48.29 for P and 8.28 for K in case of wheat crop. The contribution of organic source for N, P and K was recorded 21.76, 4.70 and 12.81 per cent and 3.47, 5.45 and 2.13 per cent for maize and wheat crops respectively. Based on the above basic parameters, soil test-based fertilizers adjustment equations were evolved for maize and wheat to achieve a definite yield target. Ready reckoner charts for fertilizer N, P2O5 and K2O application based on the soil test values for specific yield targets of maize and wheat were also prepared which would be useful for the soil testing laboratories. Top Keywords Maize, Wheat, STCR, FYM, Fertilizer prescriptions, Ready reckoner. Top |