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The phosphorus requirement of lettuce

1. Use of P intensity estimates to predict the response curve

Published online by Cambridge University Press:  27 March 2009

R. Smith  and
M. A. Scaife
R. Smith
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick
M. A. Scaife
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick
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Summary

The optimal intensity of P supply for lettuce was investigated in a pot experiment with five soils, six levels of P application (0, 15, 30, 60, 120, 240 ppm) and three times of harvest (2, 3 and 4 weeks after emergence). The P adsorption isotherm for each soil was measured in 0.01 M CaCl2.

All soils responded strongly to P application, the amounts required for maximum growth varying from 120 ppm on a sandy soil to 300 ppm on a moss peat. The differences in requirement were related to the P adsorption by the soil, and on all soils a solution P concentration of about 1 ppm resulted in maximum growth.

The Optimal leaf P concentration in young lettuce was about 0·6%.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 80 , Issue 1 , February 1973 , pp. 111 - 117
Copyright
Copyright © Cambridge University Press 1973

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