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Response of soya bean (Glycine max (L.) Merr.) to phosphorus, potassium and molybdenum applications

Published online by Cambridge University Press:  27 March 2009

U. R. Pal ,
O. O. Olufajo ,
L. A. Nnadi  and
L. Singh
U. R. Pal
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, P.M.B. 1044, Zaria, Nigeria
O. O. Olufajo
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, P.M.B. 1044, Zaria, Nigeria
L. A. Nnadi
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, P.M.B. 1044, Zaria, Nigeria
L. Singh
Affiliation:
Institute for Agricultural Research, Ahmadu Bello University, P.M.B. 1044, Zaria, Nigeria
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Summary

Field experiments during the wet seasons of 1981–1985 determined the response of soya bean to the application of P, K and Mo at four locations in the Nigerian savanna. Soya bean was grown at factorial combinations of four rates of P (0, 13·2, 26·4 and 396 kg P/ha) and two rates of K. (0 or 41·5 kg K/ha) in 1981, but in subsequent years two or three rates of Mo (0, 0·5 or 1·0 kg ammonium molybdate/ha) were included in a randomized complete block design with three replications at all locations.

Significant yield increases due to the application of P were recorded in 10 out of 11 trials. Yield increases due to 13·2 or 26·4 kg P/ha were from 29 to 210% over the control. The effects of K and Mo application were not significant in 10 out of 11 trials and eight out of nine trials, respectively. Whereas P x Mo interaction effects were significant in three trials only, highest yields were recorded due to application of 26·4 or 39·6 kg P/ha in combination with 0·5 kg ammonium molybdate/ha.

Application of P increased the percentage of P in soya-bean leaves significantly and a range of 0·275–0·330% P appears to be the critical nutrient range of P in soya-bean leaves at full bloom stage. Application of K had no effect on K concentration in leaves.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 112 , Issue 1 , February 1989 , pp. 131 - 136
Copyright
Copyright © Cambridge University Press 1989

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