Chemical composition of crown bud and rape wintering in crop of different density
Velicka, R.(Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania))E-mail:[email protected] | Rimkeviciene, M.(Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania))E-mail:[email protected] | Marcinkeviciene, A.(Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania))E-mail:[email protected] | Raudonius, S.(Lithuanian Univ. of Agriculture, Akademija, Kauno reg. (Lithuania))E-mail:[email protected]
The aim of the investigation was to determine the influence of crop density on chemical composition of winter rape crown bud in autumn period and its impact on plant wintering. The experiments were carried out at the Experimental Station of the Lithuanian University of Agriculture in the period of 1999-2002. It was established that average duration of winter rape vegetation in autumn was 96 days. In this period, rape accumulated the sum of active temperatures 857 deg C, and 24.7% of dry matter in the crown bud. At the increasing rape crop density the content of dry matter, raw protein and sulphur in rape increased, while the amount of total sugar, raw fat, potassium and phosphorus - decreased. A very high significant relationship was established between crop density and the content of total sugar (r=-0.98) and the nitrogen and potassium ratio (r=0.97) in the crown bud. The wintering of rape significantly depended on the amount of total sugar in the crown bud (r=0.91) as well as on the amount of raw fat in the crown bud (r=0.91). A negative significant correlation (r=-0.97) was established between rape wintering and the content of raw protein in the crown bud. Rape wintering significantly depended on crop density (r=-0.97). The higher rape crop density took place the worse plants wintering was determined.
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