Crude protein yield of tetraploid red clover varieties
2001
Bender, A. (Estonian Agricultural Univ., Tartu (Estonia))
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 per cent as an average of two production years (the yields 2255 and 1724 kg/ha, respectively) and 14.9 per cent (the yields 2073 and 1804 kg/ha, respectively), by 26.3 per cent as an average of three production years (the yields 2254 and 1785 kg/ha, respectively) and 28.4 per cent (the yields 2173 and 1693 kg/ha, 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 mainly caused 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 overcoming was mainly insignificant
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