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Evaluation of some sources of fertilizer phosphorus in two cycles of a paddy-wheat cropping sequence

Published online by Cambridge University Press:  27 March 2009

H. S. Hundal ,
P. S. Deol  and
G. S. Sekhon
H. S. Hundal
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
P. S. Deol
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
G. S. Sekhon
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, India
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Summary

A field experiment was made on Gurdaspur clay loam to assess the relative efficiency of various sources of fertilizer phosphorus for a paddy-wheat cropping sequence. Urea ammonium phosphate, superphosphate, a nitrophosphate fertilizer containing 30% water-soluble P and fertilizers containing 50 and 70% water-soluble P prepared from the nitrophosphate and superphosphate, dicalcium phosphate and rock phosphate were applied to the paddy crop at the rate of 0, 15, 30, 45 and 60 kg p2O6/ha and to wheat at double these rates.

The cumulative yield data for paddy and wheat show a slight reduction in efficiency of phosphatio fertilizers, with the exception of dicalcium phosphate, as their watersoluble content decreased below 70%. In general, the relative efficiency of the less water-soluble sources and of rock phosphate was considerably higher for paddy than for wheat.

The results show that the relative efficiency of low water-soluble phosphate fertilizers increased with time. The efficiency of phosphorus fertilizers declined with the rate of their application, more so in the case of higher water-soluble materials.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 3 , June 1977 , pp. 625 - 630
Copyright
Copyright © Cambridge University Press 1977

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