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生长调节剂主要影响红三叶头茬草的产量及成分,其中丁酰胼二烯酸增加头茬草年干物质和可消化干物质产量,乙酰胺只对早熟品种有影响(减少)。改变生长调节剂的浓度或时间并不会影响红三叶干物质产量和可消化干物质。处理过的红三叶比未处理的其头茬草中含有较少的可溶性碳水化合物。早期施用高浓度的丁酰胼二稀酸时,与其它处理浓度和时间的组合相比较,降低了头茬草中的中性洗涤纤维,增加了可消化干物质的含量。在加拿大生长季短的性况下,年刈割2次时,晚熟品种的年干物质产量和早熟品种一样多,但其可消化干物质含量较早熟品种高。
Growth regulators mainly affected the yield and composition of the head of Clover, butadiene conjugated trduadienolate increased dry matter and digestible dry matter yield of the first crop, whereas acetamide affected (decreased) only the precocious varieties. Changing the concentration or timing of growth regulators did not affect dry clover leaf yield and digestible dry matter. Treated red clover contains less soluble carbohydrates than untreated hay. Early application of high concentration of butyryl hydrochlore dilute acid reduced the neutral detergent fiber in the first crop of grass and increased the content of digestible dry matter compared to other combinations of treatment concentrations and times. Under Canada’s short growing season, the annual dry matter yield of late-maturing varieties was as high as that of precocious varieties when mowed twice a year, but its digestible dry matter content was higher than that of the precocious varieties.