Establishment of critical limit of zinc in soil and soybean crop
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Date
2011-05-27
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
A pot culture experiment was conducted for establishment critical
limit of zinc in soil and soybean crop at Department of Soil Science and
Agricultural Chemistry, Marathwada Agricultural University, Parbhani
during Kharif 2010 with objective to establish critical limit of zinc in
soil and for soybean crop as well as to study the effect of zi c
application on growth, yield and uptake of nutrients in soybean crop.
The experimental soil was alkaline in nature, electrical conductivity of
the soil was in safe limit for crop growth. The organic carbon status was
low to medium and soil was moderately calcareous in nature.
Soybean positively responded for application of Zn @ 7. 5
kg Zn ha- 1as well as 10 kg Zn ha- 1
, both treatments were equally
effective for improving growth and yield attributes. The concentration
of Zn as well as its uptake was increased with increasing levels of zinc
application. Soil available nitrogen, phosphorus and potassium ha\ e
shown positive balance at physiological maturity of the crop and
increased dose of zinc helped to restore the zinc status of soil. The
critical limit of zinc in soil and soybean crop was established as 0.95 mg
kg -I and 45.00 mg kg -1
, respectively. These critical limits may be
utilized for separating zinc responsive and non responsive soybean crop
in Vertisol.