CALIBRATION OF SOIL TEST, FERTILIZER DOSE AND CROP YIELD WITH AND WITHOUT FYM FOR HYBRID RICE UNDER SRI IN VERTISOL OF CHHATTISGARH PLAIN

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Date
2019
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
An experiment was conducted at instructional farm of I.G.K.V., Raipur (C.G.) during kharif season of 2018 to study “Calibration of soil test, fertilizer dose and crop yield with and without FYM for hybrid rice under SRI in Vertisol of Chhattisgarh plain”.) with the objectives- 1. Evaluating response of the hybrid rice to added fertilizers (NPK) and FYM. 2. Estimation of requirement of NPK by hybrid rice 3. Evaluation of efficiencies (soil test, fertilizer and FYM efficiencies) for hybrid rice in Vertisol, and 4. Derivation of “soil test based fertilizer prescription equation” for hybrid rice. A special field method – “Inductive cum targeted yield model”- for soil test crop response study evolved by Ramamoorthy et al. (1967) was utilized in this experiment. “Re-enforced resolvable block design” was used for experiment. First of all, three equal sized vertical fertility strips (Replication) of low fertility (L0), medium fertility (L1) and high fertility (L2) level were created in the experimental field. All the strips were further divided into three equal parts (blocks) for 3 doses of FYM “0, 5 and 10 t ha-1”, hence total 9 blocks had been there in the experimental field. Each block was further divided into 08 equal plots. Total 24 treatment combinations comprise of four different doses of N with “0, 60, 120 and 180 kg ha-1”, P2O5 with “0, 40, 80 and 120 kg ha-1” and K2O with “0, 40, 80 and 120 kg ha-1” were selected and given as fertilizer treatments. These 24 treatment combinations were again divided in to three groups of eight treatments (A, B and C) and applied in each strip. The hybrid rice (var. IRH-103) was taken as test crop. Soil samples taken before sowing were tested and uptakes of nutrients were estimated for the calculation of basic parameters. The hybrid rice yield in L0 fertility strip varied from 32 to 91.55 q ha-1 with an mean value of 68.31. Yield of rice in L1 strip was between 37 to 94 q ha-1 with average of 72.27 q ha-1, whereas the yield in L2 strip was between 41.20 to 93 q ha-1 with average of 75.18 q ha-1. For production of one quintal of hybrid rice the nutrient requirements were calculated as 1.57 kg, 0.32 kg and 1.71 kg of “N, P and K“ respectively. The contribution from “N, P and K fertilizers” (as percent efficiencies) were determined as 39.87, 30.53 and 94.53 percent respectively. In same way the contribution from soil were recorded as 32.66, 73.38 and 16.39 percent for “N, P and K” respectively. The contribution from FYM was calculated as 13.01, 5.43 and 10.10 percent for “N, P and K” respectively. For SRI hybrid rice (IRH-103), equations for fertilizers adjustment were generated based on all above basic parameters for achieving a definite targeted yield. Based on the results of the study and developed fertilizer prescription equations a ready reckoners chart were also prepared for the farmers point of view. Based on all above basic parameters following fertilizer prescription equations were derived for hybrid rice (var. IRH-103) in vertisol of Chhattisgarh plain. S.No Fertilizer prescription equations 1. FN=3.93Y-0.82SN-0.33FYM 2. FP2O5=1.03Y-1.03SP-0.18FYM 3. FK2O=1.81Y-0.17SK-0.11FYM Here “FN, FP and FK” represents the fertilizer N, P2O5 and K2O (kg ha-1). “Y” represents crop yield. (q ha-1) “SN, SP and SK” represents the NPK values of soil test. (kg ha-1) FYM represents “Farm Yard Manure “(t ha-1). The fertilizer adjustment equations derived and ready reckoners chart prepared are useful for the extension workers at field level and also soil testing laboratories can utilize it for the recommendation of fertilizers on the basis of “soil test results” and amount of FYM need to be incorporated in the field.
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