Hostname: page-component-7c8c6479df-xxrs7 Total loading time: 0 Render date: 2024-03-27T08:36:20.989Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  27 March 2009

A. Penny
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
F. V. Widdowson
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
J. F. Jenkyn
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts

Summary

An experiment at Saxmundham, Suffolk, during 1974–6, tested late sprays of a liquid N-fertilizer (ammonium nitrate/urea) supplying 50 kg N/ha, and a broad spectrum fungicide (benomyl and maneb with mancozeb) on winter wheat given, 0, 50, 100 or 150 kg N/ha as ‘Nitro-Chalk’ (ammonium nitrate/calcium carbonate) in spring

Mildew (Erysiphe graminisf. sp. tritici) was most severe in 1974. It was increased by N and decreased by the fungicide in both 1974 and 1975, but was negligible in 1976. Septoria (S. nodorum) was very slight in 1974 and none was observed in 1976. It was much more severe in 1975, but was unaffected by the fungicide perhaps because this was applied too late.

Yield and N content, number of ears and leaf area index were determined during summer on samples taken from all plots given 100 or 150 kg N/ha in spring; each was larger with 150 than with 100 kg N/ha. The effects of the liquid N-fertilizer on yield and N content varied, but leaf area index was consistently increased. None was affected consistently by the fungicide.

Yields, percentages of N in, and amounts of N removed by grain and straw were greatly and consistently increased by each increment of ‘Nitro-Chalk’. Yields of grain were increased (average, 9%) by the liquid fertilizer in 1974 and 1975, and most where most ‘Nitro-Chalk’ had been given, but not in 1976 when the wheat ripened in July; however, both the percentage of N in and the amount of N removed by the grain were increased by the liquid fertilizer each year. The fungicide increased the response to the liquid N-fertilizer in 1974, but not in 1975 when Septoria was not controlled, nor in 1976 when leaf diseases were virtually absent.

The weight of 1000 grains was increased by each increment of ‘Nitro-Chalk’ in 1975 but only by the first one (50 kg N/ha) in 1974 and 1976; it was very slightly increased by the liquid fertilizer and by fungicide each year.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1978

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dickinson, C. H. & Walpole, P. R. (1975). The effect of late applications of fungicides on the yield of winter wheat. Experimental Husbandry 29, 23–8.Google Scholar
Edgington, L. V., Khew, K. L. & Barron, G. L. (1971). Fungitoxic spectrum of benzimidazole compounds. Phyptopathology 61, 42–4.CrossRefGoogle Scholar
Fryer, J. D. & Elliott, J. G. (1954). Spraying equipment for the experimental application of herbicides. Proceedings of the Second British Weed Control Conference 1954, pp. 375–88.Google Scholar
Jenkyn, J. F. (1977). Nitrogen and leaf diseases of spring barley. Proceedings of the 12th Colloquium of the International Potash Institute, pp. 119–28.Google Scholar
Large, E. C. (1954). Growth stages in cereals. Illustration of the Feekes scale. Plant Pathology 3, 128–9.CrossRefGoogle Scholar
Mundy, E. J. & Stevens, D. B. (1974). When to use a fungicide. Arable Farming 1, no. 12, p. 13.Google Scholar
Nanne, H. W. & Radcliffe, E. B. (1971). Green peach aphid populations on potatoes enhanced by fungicides. Journal of Economic Entomology 64, 1569–70.CrossRefGoogle Scholar
Pushman, Fiona M. & Bingham, J. (1976). The effects of a granular nitrogen fertilizer and a foliar spray of urea on the yield and bread making quality of ten winter wheats. Journal of Agricultural Science, Cambridge 87, 281–92.CrossRefGoogle Scholar
Rule, J..S. (1975). Ways to boost quality in wheat. Arable Farming 2, no. 8, p. 32–3 and 40.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, Beport for 1972, Part II, 160–7.Google Scholar
Widdowson, F. V., Johnston, A. E. & Penny, A. (1977). The yield of continuous wheat at Saxmundham, 1974–76. Rothamsted Experimental Station, Beport for 1976, Part I, 91–3.Google Scholar
Widdowson, F. V., Penny, A. & Williams, R. J. B. (1967). Experiments comparing the effects on yields of potatoes of three methods of applying three amounts of NPK fertilizer and the residual effects on following winter wheat. Journal of Agricultural Science, Cambridge 69, 247–53.CrossRefGoogle Scholar
Williams, R. J. B. & Cooke, G. W. (1972). Yields of cereals grown after herbage crops at Saxmundham. Bothamsted Experimental Station, Beport for 1971, Part II, 116–17.Google Scholar