Impact of polyploidization on the crude protein yield of tetraploid red clover varieties
2001
Tamm, S. | Bender, A. (Jogeva Plant Breeding Inst. (Estonia)) | Rausberg, P.
In plot trials, seeded in a pure stand without a cover crop, tetraploid red clover varieties bred at Jogeva - 'Varte' (early) and 'Ilte' (late), outyielded the diploid standard varieties in crude protein yield at optimal harvest schedule by 30.8% as an average of two production years (the yields 2255 and 1724 kg ha*[-1), respectively) and 14.9% (the yields 2073 and 1804 kg ha*[-1), respectively), by 26.3% as an average of three production years (the yields 2254 and 1785 kg ha*[-1), respectively) and 28.4% (the yields 2173 and 1693 kg ha*[-1), respectively). Considering the crude protein content of dry matter and crude protein yield, a three-cut harvesting regime should be applied in early tetraploid red clover varieties to attain the best result. Then the first cut should be taken at the budding stage, the second at early bloom of regrowth and the third cut prior to the commencement of night frosts. The late tetraploid red clover varieties should be harvested twice-the first cut at the budding stage and the second cut prior to the first night frosts. The larger crude protein yield of tetraploid varieties was caused mainly by their higher dry matter yield; it was affected to a lesser extent by the crude protein content of dry matter. Yet, the tetraploid varieties exceeded in majority of harvest times the diploid varieties in dry matter's crude protein content but the excess was mainly insignificant.
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