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对4个苜蓿品种进行不同频次的刈割处理,结果表明,在我国北方地区,黄花苜蓿和杂花苜蓿每年适合刈割2次,此时,地上生物量和粗蛋白质产量均达到最大值;而紫花苜蓿刈割2或3次均可,地上生物量和粗蛋白质产量在刈割2和3次之间差别不大,但明显高于刈割1和4次处理;不同苜蓿品种的粗蛋白质含量与形态发育阶段之间均呈极显著的二次相关,均表现为先下降后上升的趋势。此外,通常认为的黄花苜蓿比紫花苜蓿粗蛋白质含量高,并非是由物种的差异引起的,而主要是由收获时生育阶段的差异引起的。
The four alfalfa varieties with different frequency of cutting, the results showed that in northern China, Medicago sativa and Medicago sativa suitable for mowing two times a year, at this time, the aboveground biomass and crude protein production reached the maximum; and Alfalfa cutting 2 or 3 times can be, aboveground biomass and crude protein yield between two and three mowing little difference, but significantly higher than mowing 1 and 4 treatments; different alfalfa varieties of crude protein content And the morphological development stage showed a very significant quadratic correlation between the performance of the first decline and then upward trend. In addition, the high protein content of alfalfa, which is generally considered to be higher than alfalfa, is not due to differences in species but mainly due to differences in the stage of growth at harvest.