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Effects of methods of cereal straw disposal, seedbed preparation and sowing method on the establishment, yield and oil content of winter oilseed rape (Brassica napus)

Published online by Cambridge University Press:  27 March 2009

R. J. Darby
Affiliation:
AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UK
D. P. Yeoman
Affiliation:
AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, UK

Summary

In the first of two series of experiments the effects of barley straw disposal by burning, chopping and spreading or baling and removing on winter oilseed rape were tested after seedbed preparation either by ploughing in the residue or incorporation in the soil by tine cultivation. These treatments were compared in four field experiments on silty clay loam soils at Rothamsted, UK from 1986 to 1989. The winter rape was either sown in late August or mid-September in seedbeds where either none or 50 kg N/ha had been applied.

In the first season, August-sown rape was successfully established after tine cultivation but very dry conditions prevented seedbed preparation after ploughing, consequently all ploughed treatments were sown in September. Continuing dry conditions delayed emergence of the September-sown crop, the resultant small rape seedlings suffered substantial winter kill in some treatments during a period of abnormally low temperatures. Yield from the August-sown treatments was large (c. 40 t/ha) and showed no effect of straw disposal treatment or additional seedbed N. The yield of the September-sown crop was influenced by the amount of winter kill sustained; the smallest yields resulted from tine incorporation, and the largest after ploughing, where they approached those of the early sown crop.

In the following three seasons more plants emerged from September than from August sowings. The application of seedbed N increased the plant population of the August-sown crop where the straw had been burnt. Plant losses over winter ranged from 15 to 20% and were unaffected by straw disposal treatment. There were significant differences in yield resulting from season and sowing date. Incorporating chopped straw by tine cultivation significantly decreased yield which, coupled with a lower oil content in the September-sown crop, gave a significantly smaller oil yield.

In a second series of field experiments from 1987 to 1989, the effects of improving the timeliness of rape establishment after winter wheat by broadcasting rape seed into standing wheat was compared with conventional sowing after preparing a post-harvest seedbed. After cereal harvest, straw was disposed of either by baling and removing or chopping and spreading over the rape seed. The application of 50 kg N/ha to the stubble or seedbed was also tested, as was the effect of increasing the seed rate from 8 to 16 kg/ha in two seasons.

There were always fewer plants established from broadcasting than from drilling. Generally there were fewer winter losses from broadcast seed than from drilled. Applying N to seedbed or stubble had no effect on plant population or survival except where 16 kg/ha seed was sown in 1989 and increased yield in two of the three seasons.

In spite of a smaller plant population from broadcast seed, yields were often larger from broadcast than drilled treatments. On average broadcasting the seed and baling the straw gave the largest yield although this was significant only in 1989.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 1994

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References

Baran, D. (Ed.) (1991). Monthly Digest of Statistics, Central Statistical Office. 11 1991, p. 35. London: HMSO.Google Scholar
Bowerman, P. (1991). Establishment of winter oilseed rape in the presence of the straw of the previous wheat crop. In Rapeseed in a Changing World: Proceedings of the 8th Rapeseed Congress, Saskatoon, Canada, Volume 4 (Ed. McGregor, D. I.), pp. 12241228. Saskatoon: Groupe Consultatif International de Recherche sur la Colza and the Canola Council of Canada.Google Scholar
Draper, S. R., Kingston, I. B. & Holden, M. (1979). Procedures for the comparative assessment of quality in crop varieties. I. Methods of analysis and assessment. Journal of the National Institute of Agricultural Botany 15, 114.Google Scholar
Graham, J. P., Ellis, F. B., Christian, D. G. & Cannell, R. Q. (1986). Effects of straw residues on the establishment, growth and yield of autumn-sown cereals. Journal of Agricultural Engineering Research 33, 3949.CrossRefGoogle Scholar
Lutman, P. J. W. & Dixon, F. L. (1987). The effect of drilling date on the growth and yield of oil-seed rape ( Brassica napus L.). Journal of Agricultural Science Cambridge 108, 195200.Google Scholar
Ministry of Agriculture, Fisheries and Food (1983). Oilseed Rape. MAFF Booklet 2278.Google Scholar
Ogilvy, S. E. (1984). The influence of seed rate on population, structure and yield of winter oilseed rape. Aspects of Applied Biology 6, 5966.Google Scholar
Rothamsted Experimental Station (1987, 1988, 1989, 1990). Straw treatments before sowing. Yields of the Field Experiments 86–88/R/RA/6, 89/R/RA/4.Google Scholar
Rothamsted Experimental Station (1988, 1989, 1990). Oversowing in wheat. Yields of the Field Experiments 87/R/RA/ll, 88/R/RA/8, 89/R/RA/5.Google Scholar
Russell, E. W. (1973). Soil Conditions and Plant Growth, 10th Edn, pp. 262271. London: Longman.Google Scholar
Scott, R. K., Ogunremi, E. A., Ivins, J. D. & Mendham, N. J. (1973). The effect of sowing date and season on growth and yield of oilseed rape (Brassica napus). Journal of Agricultural Science, Cambridge 81, 277285.CrossRefGoogle Scholar
Stapleton, P. G. (1987). Establishing oilseed rape by noplough no-burn techniques. Arable Farming, July 1987, 4243.Google Scholar