R.S. Meena1*, A.K. Mathur2 and S.K. Sharma2
1 National Bureau of Soil Survey & Land Use Planning (ICAR), Regional Centre, Udaipur
2 Department of Agricultural Chemistry & Soil Science, Rajasthan College of Agriculture, MPUAT-Udaipur-313001
1* corresponding author E mail: mramswaroop@gmail.com
Absract : A pot culture experiment was conducted during the year 2006-07 to assess the critical limit of zinc in soils as well as in wheat plant with eighteen alkaline soils collected from different sites of Zone (IV-b) of Rajasthan. The DTPA-extractable Zn in these soils was found positively correlated with organic carbon, clay and per cent dry matter yield of wheat. A significant negative correlation was observed between pH, sand, calcium carbonate (CaCO3) and electrical conductivity (EC). The critical limits of available Zn for soil and plant were worked out to 0.63 mg kg-1 and 38.98 mg kg-1, respectively. Application of 10 mg Zn kg-1 soil recorded maximum mean dry matter yield of wheat i.e. 17.59 g pot-1. Bray’s per cent yield (Wheat) versus DTPA-zinc in soil was found to be 0.58 mg kg-1 by graphical method and 0.63 mg kg-1 by statistical method.
Keywords : Critical limit, Zinc, Bray’s per cent yield, Alkaline soil
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