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The growth and activity of winter wheat roots in the field: nutrient uptakes of high-yielding crops

Published online by Cambridge University Press:  27 March 2009

P. B. Barraclough
P. B. Barraclough
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
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Summary

Root and shoot growth and nutrient uptake have been monitored for several winter wheat crops which gave a mean grain yield of 9·5 t/ha (85% D.M.) when grown on three soil types in 1980 and 1981. Averaged over all crops, maximum growth rates were 170 kg/ha/day for shoots and 14 kg/ha/day for roots; maximum nutrient uptake rates for N, P, K, Ca and Mg were 2·75, 0·47, 341, 0·60 and 0·18 kg/ha/day respectively. Maximum uptake of K and Ca occurred at anthesis with values of 239 and 38 kg/ha respectively, whilst for the other nutrients maximum uptake was at final harvest with values of 200, 39 and 14 kg/ha for N, P and Mg respectively. The grain contained 141 kg N, 27 kg P, 41 kg K, 3·2 kg Ca and 7·1 kg Mg/ha.

The quantity of nutrients arriving at root surfaces by mass flow was calculated for one of the crops from measurements of soil solution concentration and potential evapotranspiration data. The potential supply of nutrients by mass flow, as a percentage of that actually taken up between 19 March and 29 June, was 25% for N, 4% for K, 800% for Ca and 32% for Mg.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 106 , Issue 1 , February 1986 , pp. 45 - 52
Copyright
Copyright © Cambridge University Press 1986

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