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Response of dryland wheat to phosphorus fertilizer as influenced by profile water storage and rainfall

Published online by Cambridge University Press:  27 March 2009

Ranjodh Singh ,
R. K. Chadha ,
H. N. Verma  and
Yadvinder Singh
Ranjodh Singh
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
R. K. Chadha
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
H. N. Verma
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
Yadvinder Singh
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
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Summary

Effects of phosphorus fertilizer, initial profile water storage and seasonal rainfall on yield and water use by dryland wheat on loamy-sand and sandy-loam soils were studied for a 2-year period (1973–5). Plant available water at seeding varied from 62 to 205 mm, seasonal rainfall varied from 62 to 154 mm and available P status ranged from 9·5 to 18·5 kg P/ha. Four rates of phosphorus 0, 15, 30 and 45 kg P2O5/ha were tested. Available water at seeding, seasonal precipitation and the available P status of soil determined the yield response to phosphorus fertilizer. Response to P application was observed up to 15 kg and 30 kg P2O5/ha in loamy-sand and sandy-loam soils respectively. Growth and yield of wheat were highly correlated with the available water at planting plus seasonal rainfall. Total water use did not change in loamy-sand soil, but it increased by 16 mm in sandy-loam soil with the application of phosphorus. The profile water depletion pattern, further, indicates that the fertilized crop used more water from layers below 135 cm in loamy-sand and 22·5 cm in sandy-loam soil.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 3 , June 1977 , pp. 591 - 595
Copyright
Copyright © Cambridge University Press 1977

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