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Effects of nitrogen fertilizer and tridemorph on mildew, growth and yield of spring barley 1975–7

Published online by Cambridge University Press:  27 March 2009

J. F. Jenkyn ,
M. E. Finney  and
G. V. Dyke
J. F. Jenkyn
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
M. E. Finney
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
G. V. Dyke
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
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Summary

Experiments with spring barley in 1975–7 tested fungicides applied to control powdery mildew (tridemorph) or brown rust (benodanil) in factorial combination with six amounts of fertilizer N, applied either to the seed bed soon after sowing, as a later top dressing or half at each time.

Powdery mildew was the principal leaf disease in all three years. It tended to be increased by increments of N and by applying the N late but much less consistently in the first two years, when soils were very dry for much of the growing period, than in 1977 when amounts of rain were much closer to the long-term mean. Tridemorph significantly increased the number of ears in 1975, mean number of grains per ear in 1976 and 1000-grain weight in all three years; it gave net increases in grain yield of 0·55, 0·68 and 0·41 t/ha, respectively, in 1975–7. Yield response to increasing amounts of applied N was greatly increased where mildew had been controlled by the use of tridemorph, and was better where the N had been divided into two dressings than where it had been applied as a single dose. In 1975 and 1977 the biggest responses to tridemorph were obtained with late N but in 1976 yield was increased most by tridemorph where the N had been applied to the seed bed.

Analyses of samples taken in 1977 showed no significant effect of tridemorph sprays on concentrations of either N, P or K in the green crop. By contrast, analyses of grain samples in 1976 and 1977 showed that amounts of N in grain (mg N/grain) were affected by amounts of applied N and by tridemorph, and that there were interactions between these two factors. Concentrations of N in the grain (% D.M.) were also determined by the effects which these factors had on grain size. At small N rates tridemorph mostly increased grain size so that N concentrations were decreased by the fungicide. At large N rates increases in grain size where tridemorph had been applied were accompanied by increases in the N content of the grain (mg N/grain) so that N concentrations were either unaffected (1976) or were increased (1977) by the fungicide. With 90 kg/ha of applied N the fungicide increased the amount of N/ha removed in grain by over 21 % in each year. The apparent recoveries of N in these plots were increased from 66 to 81 % and from 87 to 105%, respectively, in the two years. Tridemorph had no significant effect on concentrations of P or K in the harvested grain but increased average amounts of these nutrients removed in the grain by 17 and 14%, respectively, in 1976 and by 14 and 7% respectively, in 1977.

Examination of black and white, infra-red aerial photographs of the experiments showed that, in each year, the brightness of individual plot images was significantly correlated with grain yield.

Complex designs without division into blocks are especially vulnerable to positional variation. Alternative methods of adjusting for such positional variation were compared in analyses of grain yields. The potential improvements in precision which might be achieved by the appropriate use of such analyses, and the difficulties of ensuring that unacceptable subjectivity and bias are not thereby introduced into the analyses, are discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 101 , Issue 3 , December 1983 , pp. 517 - 546
Copyright
Copyright © Cambridge University Press 1983

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References

Anon. (1976). Manual of Plant Growth Stage and Disease Assessment Keys. Ministry of Agriculture, Fisheries and Food. Agricultural Development and Advisory Service.Google Scholar
Austin, R. B., Bingham, J., Blackwell, R. D., Evans, L. T., Ford, M. A., Morgan, C. L. & Taylor, M. (1980). Genetic improvements in winter wheat yields since 1900 and associated physiological changes. Journal of Agricultural Science, Cambridge 94, 675–689.CrossRefGoogle Scholar
Bainbridge, A. (1974). Effect of nitrogen nutrition of the host on barley powdery mildew. Plant Pathology 23, 160–161.CrossRefGoogle Scholar
Bainbridge, A. & Jenkyn, J. F. (1976). Mildew reinfection in adjacent and separated plots of sprayed barley. Annals of Applied Biology 82, 477–484.CrossRefGoogle Scholar
Bartlett, M. S. (1978). Nearest neighbour models in the analysis of field experiments. Journal of the Royal Statistical Society Series B 40, 147–174.Google Scholar
Basson, W. D. (1976). Nitrogen and phosphorus determinations in animal feeds on a continuous flow system. Laboratory Practice 25, 763–765.Google Scholar
Blackman, J. A., Bingham, J. & Davidson, J. L. (1978). Response of semi-dwarf and conventional winter wheat varieties to the application of nitrogen fertilizer. Journal of Agricultural Science, Cambridge 90, 543–550.CrossRefGoogle Scholar
Boyd, D. A., Yuen, L. T. K. & Needham, P. (1976). Nitrogen requirement of cereals. 1. Response curves. Journal of Agricultural Science, Cambridge 87, 149–162.CrossRefGoogle Scholar
Chiang, H. C. & Wallen, V. R. (1977). Detection and assessment of crop diseases and insect infestations by serial photography. In Crop Loss Assessment Methods. F.A.O. Manual on the Evaluation and Prevention of Losses by Pests, Diseases and Weeds. Supplement 2 3.1.7/1–3.1.7/12. Slough, England: The Commonwealth Agricultural Bureaux.Google Scholar
Church, B. M. (1981). Use of fertilisers in England and Wales, 1980. Report of the Rothamsted Experimental Station for 1980, Part 2, pp. 115–122.Google Scholar
Church, B. M. & Lewis, D. A. (1977). Information from the survey of fertilizer practice, 1942–1976. Outlook on Agriculture 9, 186–193.CrossRefGoogle Scholar
Darwinkel, A. (1980). Grain production of winter wheat in relation to nitrogen and diseases. II, Relationship between nitrogen dressing and mildew infection. Zeitschrift fur Acker- und Pflanzenbau 149, 309–317.Google Scholar
Dilz, K. & Schepers, J. H. (1972). Stikstofberaesting van granen. 24. Effekt van ziektebestrijding op de stikstofreaktie van winter- en zomertarwe met en zonder toepassing van chloormequat. Stikstof 71, 452–458.Google Scholar
Ellen, J. & Spiertz, J. H. J. (1975). The influence of nitrogen and benlate on leaf-area duration, grain growth and pattern of N-, P- and K-uptake of winter wheat (Triticum aestivum). Zeitschrift für Acker- und Pflanzenbau 141, 231–239.Google Scholar
Gregory, P. H. (1951). Deposition of air-borne Lycopodium spores on cylinders. Annals of Applied Biology 38, 357–376.CrossRefGoogle Scholar
Grundy, P.M. & Healy, M. J. R. (1950). Restricted randomization and Quasi-Latin squares. Journal of the Royal Statistical Society Series B 12, 286–291.Google Scholar
Hanf, M., Kradel, J. & Menck, B. (1970). Einfluss der Mehltaubekämpfung auf Ertrag und Qualität der Sommergerste. Zeitschrift für Acker- und Pflanzenbau 131, 19–27.Google Scholar
Hebert, T. T., Rankin, W. H. & Middleton, G. K. (1948). Interaction of nitrogen fertilization and powdery mildew on yield of wheat. Phytopathology 38, 569–570.Google Scholar
Hooper, A. J. (1978). Aerial photography. Journal of the Royal Agricultural Society of England 139, 115–123.Google Scholar
Jaworski, E. G. (1971). Nitrate reductase activity in intact plant tissues. Biochemical and Biophysical Research Communications 43, 1274–1279.CrossRefGoogle Scholar
Jenkyn, J. F. (1974). A comparison of seasonal changes in deposition of spores of Erysiphe graminis on different trapping surfaces. Annals of Applied Biology 76, 257–267.CrossRefGoogle Scholar
Jenkyn, J. F. (1977). Nitrogen and leaf diseasesof spring barley. Fertilizer Use and Plant Health, Proceedings of the 12th Colloquium of the International Potash Institute, Izmir, Turkey, pp. 119–128.Google Scholar
Jenkyn, J. F. & Bainbridge, A. (1978). Biology and pathology of cereal powdery mildews. In The Powdery Mildews (ed. Spencer, D. M.), pp. 283–321. London: Academic Press.Google Scholar
Jenkyn, J. F., Bainbridge, A., Dyke, G. V. & Todd, A. D. (1979). An investigation into inter-plot interactions, in experiments with mildew on barley, using balanced designs. Annals of Applied Biology 92, 11–28.CrossRefGoogle Scholar
Jenkyn, J. F. & Finney, M. E. (1981). Fungicides, fertilizers and sowing date. In Strategies for the Control of Cereal Disease (ed. Jenkyn, J. F. and type="editors" Plumb, R. T.), pp. 179–188. Oxford: Blackwell Scientific Publications.Google Scholar
Jenkyn, J. F. & Moffatt, J. R. (1970). Report of the Rothamsted Experimental Station for 1969, Part 1, p. 152.Google Scholar
Jenkyn, J. F. & Moffatt, J. R. (1975). The effect of ethirimol seed dressings on yield of spring barley grown with different amounts of nitrogen fertilizer 1969–71. Plant Pathology 24, 16–21.CrossRefGoogle Scholar
Last, F. T. (1953). Some effects of temperature and nitrogen supply on wheat powdery mildew. Annals of Applied Biology 40, 312–322.CrossRefGoogle Scholar
Last, F. T. (1954). The effect of time of application of nitrogenous fertilizer on powdery mildew of winter wheat. Annals of Applied Biology 41, 381–392.CrossRefGoogle Scholar
Last, F. T. (1962a). Effects of nutrition on the incidence of barley powdery mildew. Plant Pathology 11, 133–135.CrossRefGoogle Scholar
Last, F. T. (1962b). Analysis of the effects of Erysiphe graminis DC. on the growth of barley. Annala of Botany, N.S. 26, 279–289.CrossRefGoogle Scholar
Mundy, E. J. & Page, R. A. (1973). Use of fungicides to control powdery mildew on spring barley. Experimental Husbandry 24, 94–104.Google Scholar
Mygind, H. (1970). Nogle faktorers inflydelse på angrebsgraden af meldug (Erysiphe graminis) på kornplanter. Tidsskrift for Planteavl 74, 177–195.Google Scholar
O'Neill, J. V. & Webb, R. A. (1970). Simultaneous determination of nitrogen, phosphorus and potassium in plant material by automatic methods. Journal of the Science of Food and Agriculture 21, 217–219.CrossRefGoogle Scholar
Paulech, C. (1969). Einfluss des Getreidemehltaupilzes Erysiphe graminis DC. auf die Trockensubstanzmenge und auf das Wachstum der vegetativen Pflanzenoigane. Biológia, Bratislava 24, 709–719.Google Scholar
Riggs, T. J., Hanson, P. R., Start, N. D., Miles, D. M., Morgan, C. L. & Ford, M. A. (1981). Comparison of spring barley varieties grown in England and Wales between 1880 and 1980. Journal of Agricultural Science, Cambridge 97, 599–610.CrossRefGoogle Scholar
Silvey, V. (1981). The contribution of new wheat, barley and oat varieties to increasing yield in England and Wales 1947–78. Journal of the National Institute of Agricultural Botany 15, 399–412.Google Scholar
Smedegaard-Petersen, V. & Stolen, O. (1980). Resistance against barley powdery mildew associated with energy-consuming defence reactions which reduce yield and grain quality. Royal Veterinary and Agricultural University, Copenhagen, Denmark, Yearbook 1980, pp. 96–108.Google Scholar
Sparrow, P. E. (1979). Nitrogen response curves of spring barley. Journal of Agricultural Science, Cambridge 92, 307–317.CrossRefGoogle Scholar
Walters, D. R. & Ayres, P. G. (1980). Effects of powdery mildew disease on uptake and metabolism of nitrogen by roots of infected barley. Physiological Plant Pathology 17, 369–379.CrossRefGoogle Scholar
Widdowson, F. V., Jenkyn, J. F. & Penny, A. (1976). Results from two barley experiments at Saxmundham, Suffolk, measuring effects of the fungicide benodanil on three varieties, given three amounts of nitrogen at two times 1973–4. Journal of Agricultural Science, Cambridge 86, 271–280.CrossRefGoogle 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, 377–390.CrossRefGoogle Scholar
Wilkinson, G. N., Eckert, S. R., Hancock, T. W. & Mayo, O. (1983). Nearest neighbour (NN) analysis of field experiments. Journal of the Royal Statistical Society Series B 45 (in the Press).Google Scholar
Williams, R. J. B. (1969). The rapid determination of nitrate in crops, soils, drainage and rainwater by a simple field method using diphenylamine or diphenylbenzidine with glass fibre paper. Chemistry and Industry 1969, pp. 1735–1736.Google Scholar
Wilson, J. C. (1972). A spraying machine for small plot’ experiments. Experimental Husbandry 21, 25–26.Google Scholar
Zadoks, J. C., Chang, T. T. & Konzak, C. F. (1974). A decimal code for the growth stages of cereals. Weed Research 14, 415–421.CrossRefGoogle Scholar