不同时期刈割对黑麦草生产性能、蛋白质含量及光合效率的影响

Effect of Different Timing Cutting on Production, Crude Protein Content and Photosynthetic Rate of Rye Grass

对不同生育期连续刈割的多花黑麦草的株高、分蘖数、茎叶比、产草量、根量、粗蛋白质含量、净光合速率进行了研究:开花期刈割处理的蛋白质产量极显著高于另两个处理的蛋白质产量;开花期刈割处理的干草产量略高于孕穗期刈割处理的干草产量,而孕穗期刈割处理的鲜草产量高于开花期刈割处理的鲜草产量,但差异都不显著;欲获得持续、稳定、高产,黑麦草最佳刈割时期应为孕穗期。

Height, tiller number, ratio of stem to leaf, grass yield, root weight, crude protein content and net photosynthetic rate of rye grass at different cutting timing were measured. Protein yield of cutting treatment on blooming stage was significantly higher than the others′. Between cutting treatment on blooming stage and boot stage, as far as hay yield, the former was higher than the latter, but fresh grass yield, the latter was higher than the former, and their difference were not significant. The optimal cutting timing was at boot stage in order to gain sustainable, steady, high yield of rye grass. 