Vol. 8, Issue 4 (2020)
Evaluation of zinc fractions as influenced by long term fertilization under rice-wheat cropping system
Author(s): Chhaviraj Baghel, Alok Tiwari, Parmanand Verma and Vinay Bachkaiya
Abstract: An investigation was carried out on permanent plots at IGKV, Raipur research farm during kharif 2019 in order to conduct experiment entitled” “Evaluation of zinc fractions as influenced by long term fertilization under rice-wheat cropping system”. ”Ten treatments for this study comprised no fertilizer “control,50% NPK, 100% NPK, 150% NPK and (NPK) combined with ZnSO4 (100% NPK + ZnSO4 @ 10kg ha-1), 100% NP, 100% N, 100% NPK + FYM @ 5t ha-1, 50% NPK + BGA @ 10 kg ha-1 and green manure (50% NPK + GM @ 40kg h-1), laid out at randomized complete block design with four replications.” The different form of zinc fractions were analyzed at surface (0-15 cm) and subsurface (15-30 cm) soil, respectively. Among “various forms of zinc fractions namely, water soluble plus exchangeable Zn (WSEX-Zn), organically bound Zn (Org-Zn), amorphous sesquioxide bound Zn (AMOX-Zn), crystalline sesquioxide bound Zn (CRYOX-Zn), residual Zn and total Zn.” The data on zinc fractions revealed that the continuous application of inorganic fertilizers and organic manures improved available zinc and its fractions in surface (0-15 cm) soil. The highest “available Zn content was recorded in 100% NPK+Zn followed by 100% NPK+FYM in surface (0-15 cm) and subsurface (15-30 cm) soil, respectively.” The water soluble plus exchangeable zinc (WSEX-Zn) fraction “was found to be the least among the zinc fractions under various treatments in surface and sub soil, respectively. The residual zinc fraction contain highest amount of Zn and it was recorded in 100% NPK+Zn followed by 100% NPK+FYM in surface (0-15 cm) and subsurface (15-30 cm) soil, respectively.” While, the lowest residual Zn content was recorded in control plot in both the surface (0-15cm) and subsurface (15-30cm) soil, respectively. The similar trend was also obtained under all the Zn fractions where the highest Zn content was recorded in 100% NPK+Zn followed by 100% NPK+FYM in surface (0-15 cm) and subsurface (15-30 cm) soils and lowest Zn content was obtained under control plot. The Zn fractions differs accordingly as WSEX-Zn < Org-Zn < AMOX-Zn < CRYOX-Zn < res-Zn.” Similarly, “organic manure addition also increased the Zn content in the surface soil. The highly positive correlation was obtained between different fractions of zinc and soil organic carbon and their combined effects on yield of rice under long term fertilizer experiment. Existing investigations show that generally the various Zn fractions increases on the surface (0-15 cm) soil, while, they decreases with the soil depth even when using Zn fertilizer.
Pages: 1695-1699 | 444 Views 62 Downloads
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How to cite this article:
Chhaviraj Baghel, Alok Tiwari, Parmanand Verma, Vinay Bachkaiya. Evaluation of zinc fractions as influenced by long term fertilization under rice-wheat cropping system. Int J Chem Stud 2020;8(4):1695-1699.
