Appraisal of Some Soil Tests for Zinc Availability to Late-Sown Wheat Grown in Mollisols

• Published in: Communications in soil science and plant analysis Vol. 39; no. 3-4; pp. 440 - 449
• Main Authors: Srivastava, Prakash C., Naresh, Megh, Srivastava, Prashant
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.02.2008; Taylor & Francis
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Indexing in process; Mollisols; Q1; Soil science; soil-test methods; wheat; zinc availability; Monocotyledones; Mollisols; soil-test methods; Zinc; Sowing; Soils; Triticum; zinc availability; Gramineae; Angiospermae; Test method; Spermatophyta; wheat
• ISSN: 0010-3624; 1532-2416
• DOI: 10.1080/00103620701826563

Five soil extractants, namely, 0.005 M diethylene triamine pentaacetic acid (DTPA) (pH 7.3), 0.005 M DTPA+1 M ammonium bicarbonate (pH 7.6), Mehlich 3, 0.01 M ethylene diamine tetraacetic acid (EDTA)+0.05 M ammonium carbonate (pH 8.6), and 1 M magnesium chloride (MgCl 2 ) (pH 6.0), were evaluated to predict the response of wheat to zinc (Zn) application in Mollisols. These extractants could be arranged in the following decreasing order of their Zn extracting power: Mehlich 3>0.005 M DTPA+1 M ammonium bicarbonate>0.01 M EDTA+0.05 M ammonium carbonate>0.005 M DTPA>1 M MgCl 2 . The critical limits of Zn in soil, below which the yield response to late sown wheat (var. UP-2338) to Zn application could be expected, were 0.57 mg 0.005 M DTPA (pH 7.3) extractable and 1.72 mg Mehlich 3-extractable Zn kg −1 soil. The critical limit of Zn in whole shoot at 60 days after emergence was found to be 26.1 mg Zn kg −1 plant tissue. The DTPA and Mehlich 3-extractable soil Zn also correlated significantly and positively with Zn concentration in whole shoot at 60 days after emergence and total Zn uptake by wheat at harvest.