Screening of maize varieties to zinc stress in calcareouus soil.
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Date
2014
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Rajendra Agricultural University, Pusa (Samastipur)
Abstract
A field experiment was conducted during the rabi season of 2012-13 in highly calcareous sandy loam soil, deficient in available Zn (0.56 mg kg-1) at Research Farm, Rajendra Agricultural University, Pusa to study the screening of maize varieties to zinc stress in calcareous soil. The experiment was laid out in split plot design assigning Zn levels ( 0, 5 and 10 Kg Zn ha-1 ) in main and twelve maize varieties ( Shaktiman 1, Shaktiman 2, Shaktiman 3, Shaktiman 5, Laxmi, Swan, Devki, Hemant , NK 6607, Raja 909, Rasitopless and Rasi 3022) in sub plot and replicated thrice. The varieties responded differently to Zn application with respect to grain and straw as well as concentration and their uptake of zinc nutrition. The average grain yield at 5.0 and 10.0 kg Zn ha-1 were statistically at par in composite varieties, but in case of hybrid and quality protein maize 10 kg Zn ha-1 has optimum. Hence, 10.0 kg Zn ha-1 was rated as optimum level for most of the varieties, only for the composite varieties may be rated 5.0 kg Zn ha-1 level for maize production.
On the basis of percent response (figure in Parenthesis) to grain yield the relative susceptibility of maize varieties to Zn stress were as follow.
Shaktiman 5 >
(32.9) Rasi 3022 >
(27.5) Raja 909>
(26.5) Rasitopless >
(26.3)
NK 6607 >
(24.5) Shaktimn 1 >
(19.9) Shaktiman 3>
(17.7) Shaktiman 2>
(16.9)
Devki >
(16.5) Laxmi >
(12.3) Swan >
(10.8) Hemant
(10.0)
The varieties giving highest magnitude of response were rated to be most inefficient and those giving least response were classified as most efficient.
On the basis of Zinc efficiency index and Zinc efficiency, out of twelve maize varieties screened under zinc stress and sufficient condition the Laxmi, Swan, Devki and Hemant were found to be efficient and Raja 909, Shaktiman 5, NK 6607, Rasi 3022 and Rasitopless varieties were found to be inefficient.