Relationships between spring oilseed rape density, assimilating leaf area, lighting and yield
2005
Velicka, R., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania) | Marcinkeviciene, A., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania) | Rimkeviciene, M., Lithuanian Univ. of Agriculture, Noreikiskes (Lithuania). Experimental Station | Treciokas, K., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania) | Venskutoniene, E., Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania)
In the period of 2002-2003, at the Experimental Station of the Lithuanian University of Agriculture, the influence of spring oilseed rape (Brassica napus L. ssp. oleifera annua Metzg.) "Sponsor" density on plant assimilating leaf area, lighting of crop layers, plant yield at the flowering stage, and seed yield was investigated, as well as relationships between these indicators were determined. The data show that at increasing crop density (from 50.1 to 350 plants mE-2), the leaf area index increased (r = 0.99, P is less than or = 0.01), while assimilating leaf area per plant decreased (r = -0.89, P is less than or = 0.01) and depended on the light flux reaching soil surface (r = 0.98, P is less than or = 0.01) and also 1/4 and 1/2 crop layers (r=0.93 and P is less than or = 0.01; r = 0.83, P is less than or = 0.05). At increasing crop density, the seed yield per plant significantly decreased from 33.1 to 78.5% and depended on assimilating leaf area per plant (r=0.99, P is less than or = 0.01) and yield of one plant at the flowering stage (r = 0.95, P is less than or = 0.01). At an increasing number of plants per m-2 (up to 259), rapeseed yield significantly increased from 28.6 to 58.8%, as compared with thinnest crop, and when the crop reached average density of 347 plants m-2, the seed yield significantly decreased due to reduction of plant size and productivity. Significant parabolic relationship (r = 0.92, P is less than or = 0.05) was established between rapeseed yield and crop productivity at the flowering stage.
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