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Effects of subsurface drip irrigation rates and furrow irrigation for cotton grown on a vertisol on off-site movement of sediments, nutrients and pesticides

Improvement of soil properties by application of olive oil waste

Diagnosis of limiting factors of organic oilseed rape yield. A survey of farmers’ fields

Seed quality of high protein corn lines in low input and conventional farming systems

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Agronomy for Sustainable Development : Volume 28, Issue 3, September 2008

Agronomy for Sustainable Development : Volume 28, Issue 2, June 2008

Agronomy for Sustainable Development : Volume 28, Issue 1, March 2008

Agronomy for Sustainable Development : Volume 27

Diagnosis of limiting factors of organic oilseed rape yield. A survey of farmers’ fields

Content Provider	Springer Nature Link
Author	Valantin Morison, Muriel Meynard, J. M.
Copyright Year	2008
Abstract	The yield of organic winter oilseed rape (WOSR) crop is low and variable in organic farming, but the reasons responsible for this problem are not clear. Aiming to identify the factors affecting organic oilseed rape yields, we carried out a diagnostic study on a network of 19 farmers’ fields in four contrasting regions of France over a two-year period. Weed density and biomass, nitrogen absorption by the crop and by weeds, and nutrient availability in the soil, as well as the occurrence of pests and diseases, were assessed at four developmental stages. A range of possible limiting factors throughout the crop cycle led us to use a regression procedure for different periods, using the yield components during spring and biomass during autumn as dependent variables. We identified factors limiting yield and the critical time points at which they acted, which has never been done. Yield variation was strongly correlated with number of grains.m$^{−2}$. Dry biomass of weeds, nitrogen uptake by weeds and density of weeds appeared to explain 39% of variation in crop biomass in early winter, while pollen beetle and rape stem weevil damage explained 4.5% and 12% of variation in the number of flowers.m$^{−2}$ and the number of branches.m$^{−2}$, respectively. Crop nitrogen deficiencies occurring before branching were strongly correlated with weed biomass in flowering. Analysis of covariance showed that sowing date, soil management and the quantity of organic manure application may have significantly affected the nitrogen nutrition index, nitrogen uptake by plants and ratio of weed biomass: a late sowing date and shallow soil tillage were related to a low crop nitrogen nutrition index and high ratio of weed biomass. From a practical point of view, this study demonstrated that it should be possible to reduce weed competition by ensuring that the amount of nitrogen in soil before sowing is around 100 kg/ha.
Starting Page	527
Ending Page	539
Page Count	13
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	28
Issue Number	4
e-ISSN	17730155
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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