Abstract:

In order to study the effects of different clipping periods and heights on Alfalfa quality, several investigations on the effects of different clipping periods and heights on Alfalfa quality were launched. Golden Queen Alfalfa and Sandeli Alfalfa cropped with the proportion of 1:1 were Chosen as experiment materials. The production and the nutritional content of hay forage at different clipping heights and phenophases were determined. The results showed that compared with harvested Alfalfa in early florescence, the production of fresh forage and hay forage clipped when Alfalfa grew to 80 cm height, were 2510.4 kg·hm^-2 and 807.3 kg·hm^-2 greater, respectively. CP content and RFV value were 2.45% and 1.35 higher, respectively. Taken growth height as the standard, clipping at 80 cm height could get the best quality and production of Alfalfa forage in Chifeng region.

Key words: Alfalfa, Clipping period, Clipping height, Quality

摘要：

为研究不同刈割时期与刈割高度对苜蓿品质的影响，开展不同刈割时期和刈割高度对紫花苜蓿干草质量影响的研究，以1：1比例种植的金皇后（Golden Empress）与三得利（Sanditi）紫花苜蓿为试验材料，于不同生育时期与刈割高度进行干草产量和营养成分测定。结果表明：与初花期收获的苜蓿相比，苜蓿生长高度80 cm（现蕾期）左右时刈割，鲜草产量和干草产量比初花期分别高2510.4 kg·hm^-2和807.3 kg·hm^-2，粗蛋白（Crude Protein，CP）量和相对饲用价值（Relative Feed Value，RFV）值分别高2.45%、1.35，差异极显著（P<0.01）。综合得出，在赤峰地区，以生长高度为刈割标准，株高在80 cm左右时刈割可以得到质量兼优的苜蓿草。

关键词: 紫花苜蓿, 刈割时期, 刈割高度, 品质