灌溉条件下紫花苜蓿留茬高度的再生效应

Regrowth effects of stubble height on alfalfa in irrigated fields

为确立灌溉农田下紫花苜蓿的刈割制度,2003-2006年在地处西辽河平原的内蒙古民族大学试验农场进行留茬高度效应的研究。结果表明,株高、节间距、根干重、越冬率留茬5 cm刈割均低于留茬10 cm刈割,但1级分枝数、节间数均高于留茬10 cm刈割;营养品质留茬10 cm的好于留茬5 cm的;草产量前2年留茬5 cm较高,而后2年较低,4年总产量留茬10 cm略高;连续4年刈割后田间密度留茬10 cm的较留茬5 cm的高3.8株/m2。

In order to establish the clipping system of alfalfa in irrigated fields, the effects of stubble height were studied from 2003 to 2006 at Inner Mongolia University for Nationalities in Xiliaohe Plain. The results showed that, the plant height, the internode length, the root weight and over-wintering rate of 5 cm stubble height are all lower than those of 10 cm stubble height, but the branch number and the internode number are all higher than those of 10 cm stubble height. The nutritive quality of alfalfa was better under 10 cm stubble height. Compared with those of 10 cm stubble height, the hay yield of 5 cm stubble height was higher in the first two years, but was lower in the last two years, and the 4 years total yield was slightly lower. After 4 years of clipping, the population of 10 cm stubble height was 3.8 plant/m^2 more than that of 5 cm stubble height.