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Response of wheat to zinc and its critical level in Old Alluvium soils

Published online by Cambridge University Press:  27 March 2009

A. P. Singh ,
R. Sakal ,
K. N. Thakur  and
H. Sinha
A. P. Singh
Affiliation:
Tirhut College of Agriculture, Dholi, Muzaffarpur, Rajendra Agricultural University, Pusa (Bihar), India
R. Sakal
Affiliation:
Tirhut College of Agriculture, Dholi, Muzaffarpur, Rajendra Agricultural University, Pusa (Bihar), India
K. N. Thakur
Affiliation:
Tirhut College of Agriculture, Dholi, Muzaffarpur, Rajendra Agricultural University, Pusa (Bihar), India
H. Sinha
Affiliation:
Tirhut College of Agriculture, Dholi, Muzaffarpur, Rajendra Agricultural University, Pusa (Bihar), India
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Summary

A pot culture experiment with 30 Old Alluvium soils was conducted to evaluate the critical Zn concentration in soils and wheat plants for predicting the response to Zn application. The DTPA-extractable Zn (available Zn) in these soils ranged from 0·37 to 4·50 mg/kg soil, and total Zn in the wheat plants of the control pots ranged from 17 to 65 mg/kg wheat shoots. The DTPA-extractable Zn was found to be positively correlated with organic carbon (r = 0·72, P < 0·01), negatively with pH (r = –0·48, P < 0·01) and positively with wheat tissue Zn concentration (r = 0·98, P < 0·01). The Bray's ‘per cent’ yield value was positively correlated with ‘available’ Zn (r = 0·82, P < 0·01) and plant tissue Zn (r = 0·85, P < 0·01). The critical concentration of Zn in soil and plant below which responses to applied Zn may be expected was 0·65 mg Zn/kg soil and 24·5 mg Zn/kg wheat shoots respectively. All the soils below 0·65 mg Zn/kg soil responded to Zn application where the ‘per cent’ response at 5mg added Zn/kg soil ranged from 22·65 to 100·00 with a mean value of 58·24 whereas at 10 mg added Zn/kg soil, it ranged from 13·08 to 97·14 with a mean value of 40·08. Soils above the critical limit negatively responded to Zn application.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 1 , August 1980 , pp. 175 - 179
Copyright
Copyright © Cambridge University Press 1980

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References

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