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Effect of nitrogen, phosphorus and potassium application on yield of potato tubers (Solatium tuberosum L.)

Published online by Cambridge University Press:  27 March 2009

U. C. Sharma  and
B. R. Arora
U. C. Sharma
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, Punjab, India
B. R. Arora
Affiliation:
Department of Soils, Punjab Agricultural University, Ludhiana, Punjab, India
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Summary

Six field experiments, three each during 1982–3 and 1983–4, were conducted on a sandy loam soil to study the effect of varying levels of nitrogen, phosphorus and potassium, in the absence and presence of farmyard manure (FYM) (30 t/ha), on the number of tubers and yield of potato in three grades. Increase in nitrogen, phosphorus and potassium application, in the absence or presence of FYM, did not significantly affect the total number of tubers/m2 but did affect the number of tubers in different grades. An increase in nitrogen and potassium significantly decreased the number of tubers/m2 in small (< 25 g) and increased in medium (25–75 g) and large (> 75 g) grades at 45, 60, 75 and 90 days after planting. Increase in the application of phosphorus increased the number of tubers/m2 in the small grade and decreased it in the large grade but did not affect the number in the medium grade. Increase in nitrogen and potassium application decreased the tuber yield in the small grade and increased it in the medium and large grades. Applied phosphorus increased the yield in the small and medium grades and decreased it in the large grade. The increase in the yield of tubers with increase in nitrogen and potassium application was found to be caused by an increase in the number of tubers in the medium and large grades at the expense of the small grade; however, with applied phosphorus the increase in yield was due to increase in the weight of individual tubers within the small and medium grades. FYM application decreased the number of tubers in the small grade and increased it in the medium and large grades. The response of potato to nitrogen increased and to phosphorus and potassium decreased with the application of FYM.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 108 , Issue 2 , April 1987 , pp. 321 - 329
Copyright
Copyright © Cambridge University Press 1987

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