National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Field experiments were conducted during Kharif season 2015-16 at twenty farmer’s field to refine the critical limit of Zinc in soils for rice crop grown in Mandla district of Madhya Pradesh. The soils of study sites varied in available Zn from 0.12 to 2.17 mg kg-1 and classified in three groups i.e., deficient (<0.60 mg Zn kg-1), marginal (>0.60 to <1.2 mg Zn kg-1) and adequate (>1.2 mg Zn kg-1). The soils were clayey, neutral to slight alkaline in reaction and low in organic carbon. The Zn treatments (0, 2, 4, 6 and 8 kg Zn ha-1 through ZnSO47H2O and 60 kg N, 60 kg P2O5 and 40 kg K2O through urea, single super phosphate (SSP) and muriate of potash, respectively were applied at the time of sowing in a factorial RBD and 60 kg N ha-1 was applied at tillering stage. The rice MTU-1010 variety was sown @ 80 kg seed ha-1 at 22.5 cm row to row spacing and harvested at maturity (120 DAS). The findings suggested that the increasing levels of Zn addition significantly increased the grain yield over control and optimum was at 6.0 kg Zn ha-1. The grain yield was identical at 6.0 and 8.0 kg Zn ha-1. In field situation, the critical limit of Zn was calculated to be 0.62 mg kg-1 using Cate and Nelson statistical method and gave a predictability value of 53 per cent. Critical limits of Zn in soil for rice calculated to be 1.12 mg kg-1 by NH4HCO3 DTPA, 0.57 mg kg-1 by NH4OAC, 0.88 mg kg-1 by EDTA (NH4)2 CO3 and 0.31 mg kg-1 by 0.05 N HCl + 0.025 N H2SO4. Critical levels of Zn were found to be 12.7 mg kg-1 for paddy grain. In study area, paddy crop responded to Zn application. Hence, the application of 6 kg Zn ha-1 in soil through ZnSO47H2O will enhance the productivity of rice.
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