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Effects of eight factors on the growth and nutrient uptake of winter wheat and on the incidence of pests and diseases

Published online by Cambridge University Press:  27 March 2009

R. D. Prew ,
B. M. Church ,
A. M. Dewar ,
J. Lacey ,
A. Penny ,
R. T. Plumb ,
Gillian N. Thorne ,
A. D. Todd  and
T. D. Williams
R. D. Prew
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
B. M. Church
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
A. M. Dewar
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
J. Lacey
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
A. Penny
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
R. T. Plumb
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
Gillian N. Thorne
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
A. D. Todd
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
T. D. Williams
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
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Summary

A multifactorial experiment sown to winter wheat cv. Hustler in autumn 1978 tested the effects of combinations of the following eight factors, each at two levels: drill type, sowing date, amount of nitrogen, division of nitrogen, irrigation, autumn pesticide (aldicarb), summer aphicide (pirimicarb), and fungicide (carbendazim, maneb and tridemorph).

The mean grain yield of all plots was 9·7 t/ha and the best eight-plot treatment mean was 11·3 t/ha. The factors that had the greatest effect on yield were aphicide and fungicide, mainly from the control of Metopolophium dirhodum and Septoria spp. respectively. Both factors increased grain size and their effects were more than additive and greater with 250 than with 160 kg N/ha. Aphicide and fungicide also temporarily decreased the numbers of microbes on the developing ears. Autumn pesticide gave good control of aphids in the winter and some control in the summer: it also decreased nematode populations and slightly increased yields.

Precision sowing compared with random distribution of seeds along the row had little effect on growth or yield. Sowing on 21 September compared with 13 October greatly increased growth early in the season but had less effect after anthesis; it was the only factor that increased yield when aphicide and fungicide were applied. There was negligible infection by barley yellow dwarf virus in crops sown on either date. The amount and division of N fertilizer affected N uptake early in the season and had small effects on the production and survival of tillers. Three N applications instead of one slightly increased grain yields but did not affect total N uptake by grains plus straw, which averaged 190 kg N/ha. The larger amount of N always increased N uptake but decreased yield in the absence of aphicide and fungicide. Irrigation slightly decreased yield despite prolonging the duration of green leaf area.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 2 , April 1983 , pp. 363 - 382
Copyright
Copyright © Cambridge University Press 1983

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