STUDIES ON SULPHUR AND NITROGEN USING INM APPROACH UNDER RICE CROP IN A VERTISOL

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Date
2020
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The field experiment was carried out in rice crop on a Vertisol at Research and Instructional farm, Department of SSAC, COA, IGKV,“Raipur, during kharif”2019. In the on-going“long term fertilizer experiment initiated” in kharif 1999“on rice-wheat cropping system,”in Chhattisgarh plain in order to studies on sulphur and nitrogen using INM approach under rice crop in a Vertisol. The ten treatments for this experiment“comprised of no fertilizer control,”“50% NPK,”“100% NPK,”“150% NPK,”“100% NPK”+“ZnSO4@ 10kg”ha-1,”100% NP, “100% N,”“100% NPK + FYM” @“5t ha-1”, “50% NPK+BGA”@ “10kg ha-1” and “50% NPK + GM” @“40kg h-1”,“laid“out at randomized complete block design with four replications.” The continues application of fertilizers and manures significantly influenced the physico-chemical properties viz. highest OC, available N, P and K in 100% NPK + FYM.” However,{the highest available S}content was recorded in 150% NPK as compared to other treatments in surface (0-15 cm) soil. The increase in major as well as secondary nutrient availability in soil before transplanting of rice“was at par in 100% NPK + FYM and 150% NPK.”However,“available N”and S were decreased with the increase in depth (0-15 to 15-30 cm) in 150% NPK as well as other nutrient combination. Forms of nitrogen in soil revealed that the significantly highest ammonical and nitrate N were recorded in 150% NPK followed by 100% NPK + FYM over the control. Various forms of sulphur (i.e. sulphate sulphur, organic sulphur, heat soluble sulphur and water soluble sulphur) revealed that the significantly highest forms of sulphur were recorded in super optimal dose of NPK i.e. “150% NPK followed by 100% NPK”+ Zn @ 10 kg ha-1 and significantly superior over the sole application of nitrogenous fertilizer{and control.} The different forms of sulphur were significantly and highly correlated with grain yield of rice amongst continues“application of inorganic fertilizers and manures.”The highest positive correlation was observed in heat soluble sulphur with yield of rice. The relationship between nitrogen and sulphur fractions and their combined effects on yield of rice under INM approach revealed that the interaction between nitrogen and sulphur fractions with rice yield was significantly influenced by inorganic fertilizers and organic manures over control. Various forms of nitrogen viz. ammonical and nitrate nitrogen were also positively and significantly correlated with yield of rice and revealed that the ammonical nitrogen was highly correlated with yield of rice as compared to nitrate nitrogen amongst continues application of inorganic fertilizers and manures. The study additionally recommended that“use of a FYM and GM enhanced the rice”crop yield when applied with balanced fertilizers either in optimal (100% NPK) or sub optimal (50% NPK) level.
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STUDIES ON SULPHUR AND NITROGEN USING INM APPROACH UNDER RICE CROP IN A VERTISOL
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