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The interactions of water and fertilizer nitrogen in effects on growth pattern and yield of potatoes

Published online by Cambridge University Press:  27 March 2009

B. J. Clutterbuck  and
K. Simpson
B. J. Clutterbuck
Affiliation:
The Edinburgh School of Agriculture, Edinburgh
K. Simpson
Affiliation:
The Edinburgh School of Agriculture, Edinburgh
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Summary

Three field experiments in 2 years were made in S.E. Scotland to investigate the effect of water (normal rainfall or irrigation to maintain soil moisture tension between pF 2·0 and 2·5) on the response of the potato crop to nitrogen fertilizer (0, 100, 200 or 300 kg N/ha).

Final tuber yield was closely related to leaf area duration. Addition of water reduced the delay in early haulm growth resulting from fertilizer nitrogen application. The beneficial effect of reducing moisture tension could not be related to water per se, nitrate, ammonium or conductivity levels in the fertilizer band or nitrogen uptake. Accumulation of nitrate in the roots and stems + petioles early in the season indicated that the rate of protein synthesis was reduced at high soil moisture tension in the presence of fertilizer nitrogen.

In a long growing season (1971, 153 days) there was a significant response of tuber yield to nitrogen, with an increase in yield even at the highest rate tested (300 kg N/ha) and irrigation enhanced this response.

In a normal season (1970, ca.130 days) there was a significant irrigation x nitrogen interaction on tuber yield. Irrigation increased the optimum rate of nitrogen from 100 to 200 kg N/ha in one experiment and from nil to 200 kg N/ha in another.

Addition of water increased the number of tubers at harvest but the effect of nitrogen was less consistent. Yield increases resulting from application of nitrogen or reduction in soil moisture tension were mainly due to increases in the proportion of large tubers.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 91 , Issue 1 , August 1978 , pp. 161 - 172
Copyright
Copyright © Cambridge University Press 1978

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