Vol. 7, Issue 3 (2019)
Targeted yield prescriptions and its assessment of various soil parameters in yield and nutrient uptake for hybrid rice (Oryza sativa L. cv – US-382) in inceptisols of Assam, India
Author(s): Namrata Kashyap, KN Das, Bipul Deka and Marami Dutta
Abstract: Soil Test Crop Response (STCR) study was conducted during 2016-17 for hybrid rice (cv US-282) under integrated plant nutrition system (IPNS) in Inceptisols (Aeric Endoaquepts) in Jorhat district of Assam. The basic parameters were computed from the STCR data, and the fertilizer prescription equations were developed for recommending fertilizer doses in hybrid rice and assessment of various soil parameters were done. After harvest of the exhaust crop (cv Ranjit) results revealed the average organic carbon content increased from 0.24 to 0.66 per cent which was found to increase by 1.75 per cent in gradient II as compared to gradient I. Available N increased from 210.70 to 358.20 kg ha-1 with gradient. Gradient III recorded the highest of available N that is 358.20 kg ha-1. Available phosphorus content in soil increased with increasing fertility gradients. That is from 18.80 to 56.20 kg ha-1 and highest value of 56.20 kg ha-1 was recorded in Gradient III. Available potassium content in soil increased with increasing fertility gradients. Available K2O increased from 117.90 to 289.00 kg ha-1. The highest mean soil test value of available nitrogen for test crop (cv US-382) was recorded in Strip L2 (356.62 kg ha-1) while the lowest value was observed in control that in Strip L0 (183.13 kg ha-1). The mean amount of available potassium ranged from 172.14 to 237.58 kg ha-1. Among the strips the highest average value of available potassium content was recorded in Strip L2 (237.58 kg ha-1). Maximum yield for hybrid rice was obtained in strip L2 (57.3 qha-1) order. Similarly, strip-wise average nutrient uptake was in the order of strip L2 > strip L1 > strip L0. The fertilizer prescription equations were developed and nomograms were formulated based on the equations for a range of soil test values and desired yield target for rice. Under NPK + VC @ 10.0 t ha -1, 30, 11, 28 kg ha-1 of fertilizer N, P2O5 and K2O, respectively could be saved for attaining yield target of 80 q ha-1 for hybrid rice as compared to NPK fertilizers alone. The grain yield of rice had a significant positive correlation with organic carbon (r = 0.664**), available N (r = 0.292*), available P2O5 (r = 0.346**) and available K2O (r = 0.456**). Similarly, the grain yield of rice was also found to be significantly and positively correlated with uptake of N, P2O5 and K2O at 1% level of significance.
Pages: 2189-2193 | 440 Views 98 Downloads
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How to cite this article:
Namrata Kashyap, KN Das, Bipul Deka, Marami Dutta. Targeted yield prescriptions and its assessment of various soil parameters in yield and nutrient uptake for hybrid rice (Oryza sativa L. cv – US-382) in inceptisols of Assam, India. Int J Chem Stud 2019;7(3):2189-2193.
