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Tests of amounts and times of application of nitrogen and of sequential sprays of aphicide and fungicides on winter wheat, following either beans or wheat, and the effects of take-all (Gaeumannomyces graminis var. tritici), on two varieties at Saxmundham, Suffolk 1980–3

Published online by Cambridge University Press:  27 March 2009

F. V. Widdowson
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
A. Penny
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
R. J. Gutteridge
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
R. J. Darby
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ
M. V. Hewitt
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts., AL5 2JQ

Summary

From 1980 to 1983 factorial experiments at Saxmundham were made on winter wheat following beans, so as to minimize losses from foot and root rots and increase potential yields. All tested seed-bed N, and amounts and times of application of N in spring, both with and without sprays intended to limit losses from aphids and from diseases. The tests were made on one semi-dwarf variety in 1980 and on two contrasting varieties from 1981 to 1983. In 1982 and 1983 a comparison was made between wheat following beans and wheat following wheat; all treatments were applied cumulatively to the two successive wheat crops.

In 1980 and in 1981 N given in March greatly increased the number of shoots in April but had little effect on the final number of ears. Yields of grain were greatly increased by N given during April and by sequential sprays with fungicides and aphicide; these two factors interacted so that responses to N were larger with the sprays than without. Yield responses to seed-bed N, although small, were greater than the benefits from applying divided instead of single N dressings in spring. The number of ears was greatly increased by increasing the amount of N given in April, but only slightly by any of the other treatments. The weight of 1000 grains was greatly increased by the sprays of aphicide and fungicides and was decreased by N in 1981, but not in 1980. Largest yields of grain were 10·14 t/ha in 1980 and 10·91 t/ha in 1981 when N was given in spring at 160 and 200 kg/ha respectively, and the crops were sprayed with pesticides.

In 1982 and 1983 N applied in March again greatly increased the number of shoots in April, but not the final number of ears. Yields of grain were larger after beans than after wheat, mainly because the number of ears and the weight of 1000 grains were greater. This may have been because take-all (Gaeumannomyces graminisvar. tritici) was more severe where wheat followed wheat. Previous cropping also interacted with variety; Avalon yielded slightly less than Norman where take-all was slight but much less where take-all was severe. Where N was given the mean loss in yield from growing Avalon rather than Norman in the 2 years was 2·47 t/ha after wheat and 0·37 t/ha after beans. The take-all disease ratings of Norman and Avalon after wheat were 132 and 197 respectively. Yields of grain were greatly increased by N given during April, especially of wheat following wheat and where it was protected with sprays; then the mean yield was only 2·79 t/ha without N but 8·78 with 235 kg N/ha. Where wheat followed beans, yields were 6·89 t/ha without N and 11·07 with 175 kg N/ha. Applying N to the seed bed increased yields slightly, and again by more than by dividing the dressing of N in spring. The number of ears was greatly increased by N in spring and a little by all the other factors that increased grain yield. The weight of 1000 grains was increased greatly by the sprays of aphicide and fungicides, was decreased by N, and was larger for Norman than for Avalon.

In 1980–1, after beans, the mean amounts of N removed by the grain (where aphicide and fungicides were given) ranged from 81 kg/ha without N fertilizer to 167 where most N was given. In 1982–3 comparable values ranged from 86 kg N/ha to 191 where wheat followed beans and from 35 kg N/ha to 168 where wheat followed wheat.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1985

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References

REFERENCES

Benzian, B. & Lane, P. (1979). Some relationships between grain yield and grain protein of wheat experiments in south-east England and comparisons with such relationships elsewhere. Journal of the Science of Food and Agriculture 30, 5970.Google Scholar
Church, B. M. & Leech, P. K. (1983). Fertiliser use on farm crops in England and Wales, 1982, p. 8. London: Ministry of Agriculture, Fisheries and Food (SS/CH/11).Google Scholar
Cooke, G. W. (1975). The achievements of ten years work at Saxmundham Experimental Station. Rothamsted Experimental Station, Report for 1974, Part 2, pp. 187194.Google Scholar
Darby, R. J., Widdowson, F. V. & Hewitt, M. V. (1984). Comparisons between the establishment, growth and yield of winter wheat on three clay soils, in experiments testing nitrogen fertilizer in combination with aphicide and fungicides, from 1980 to 1982. Journal of Agricultural Science, Cambridge 103, 595611.CrossRefGoogle Scholar
Hodge, C. A. H. (1972). The soils at Saxmundham Experimental Station. Rothamsted Experimental Station, Report for 1971, Part 2, pp. 143148.Google Scholar
Lester, E. (1982). Introduction to Plant Pathology Department report. Rothamsted Experimental Station, Report for 1981, Part 1, pp. 185187.Google Scholar
National Institute of Agricultural Botany (1981 and 1982). Recommended varieties of cereals. Farmers Leaflet No. 8.Google Scholar
Penny, A., Widdowson, F. V. & Jenkyn, J. F. (1978). Spring top-dressings of ‘Nitro-Chalk’ and late sprays of a liquid N-fertilizer and a broad spectrum fungicide for consecutive crops of winter wheat at Saxmundham, Suffolk. Journal of Agricultural Science, Cambridge 90, 505516.CrossRefGoogle Scholar
Penny, A., Widdowson, F. V. & Jenkyn, J. F. (1983). Experiments with solid and liquid N-fertilizers and fungicides on winter wheat at Saxmundham, Suffolk, 1976–9. Journal of Agricultural Science, Cambridge 100, 163173.CrossRefGoogle Scholar
Prew, R. D. (1983). Factors limiting yield of winter wheat; fungal diseases. Rothamsted Experimental Station, Report for 1982, Part 1, pp. 2223.Google Scholar
Prew, R. D., Church, B. M., Dewar, A. M., Lacey, J., Penny, A., Plumb, R. T., Thorne, G. N., Todd, A. D. & Williams, T. D. (1983). Effects of eight factors on the growth and nutrient uptake of winter wheat and on the incidence of pests and diseases. Journal of Agricultural Science, Cambridge 100, 363382.Google Scholar
Slope, D. B., Etheridge, J. & Williams, R. J. B. (1973). Grain yield and the incidence of take-all and eyespot in winter wheat grown in different crop sequences at Saxmundham. Rothamsted Experimental Station, Report for 1972, pp. 160167.Google Scholar
Slope, D. B., Prew, R. D., Gutteridge, R. J. & Etheridge, J. (1979). Take-all, Gaeumannomyces graminis var. tritici, and yield of wheat grown after ley and arable rotations in relation to the occurrence of Phialophora radicicola var. graminicola. Journal of Agricultural Science, Cambridge 93, 377389.Google Scholar
Thorne, G. N., Dewar, A. M., Prew, R. D., Williams, T. D., Lacey, J., Plumb, R. T., Penny, A., Church, B. M. & Todd, A. D. (1983). Factors limiting yield of winter wheat; yield at maturity. Rothamsted Experimental Station, Report for 1982, Part 1, pp. 1920.Google Scholar
Widdowson, F. V., Darby, R. J. & Bird, E. (1983). Mineral nitrogen in soils under winter wheat during winter and spring. Rothamsted Experimental Station, Report for 1982, Part 1, p. 261.Google Scholar
Widdowson, F. V., Jenkyn, J. F. & Penny, A. (1980 and 1981). Fungicides, N and Growth Regulator. Rothamsted Experimental Station, Yields of the Field Experiments 1979, pp. 241–243; 1980, pp. 197201.Google Scholar
Widdowson, F. V., Jenkyn, J. F. & Penny, A. (1982). Results from factorial experiments testing amounts and times of granular N-fertilizer, late sprays of liquid N-fertilizer and fungicides to control mildew and brown rust on two varieties of spring barley at Saxmundham, Suffolk 1975–8. Journal of Agricultural Science, Cambridge 99, 377390.CrossRefGoogle Scholar
Widdowson, F. V., Johnston, A. E. & Penny, A. (1980). Multifactorial experimentation on continuous winter wheat grown in sandy clay soil at Saxmundham, Suffolk. Journal of Agricultural Science, Cambridge 94, 155170.CrossRefGoogle Scholar
Zadoks, J. C., Chang, T. T. & Konzak, C. F. (1974). A decimal code for the growth stages of cereals. Weed Research 14, 415421.Google Scholar