早期刈割对苜蓿再生性的影响

The effect of early cutting on regrowth of alfalfa

对苜蓿Medicago sativa进行早期刈割处理,以正常刈割时间(1/10开花期)为对照,设7个不同刈割时期进行刈割处理,测定与苜蓿生产性能和再生性相关的各项指标,研究早期刈割对苜蓿再生性和生产性能的影响,对不同时期刈割处理后的鲜草产量及其相关性状的动态变化进行测定。结果表明,不同刈割处理下苜蓿的再生性能存在明显差异,极早期刈割处理产草量最低;适宜刈割,也就是初花期刈割产草量最高。7个刈割处理生长性状动态变化为:株高在分枝期、孕蕾期、开花期有较大差异;除提前25 d刈割的处理外,其他各个处理的侧枝数、节间数差异较小;叶片数在不同生育期的动态变化为:分枝期不同处理间无差异,从孕蕾期到开花期处理间差异很明显;分枝数在整个生育期的不同处理间变化不是很显著;草产量与其相关性状株高和分枝数呈显著正相关。

Adopting early cutting in comparison to the usual cutting time, cutting every 5 d, there are 7 cutting treatments. The dynamics of biomass and other growth related characters of 7 alfalfa treatments were studied in this experiment by planting in the same environment. The results showed that： the effect of the earliest cutting on regrowth of alfalfa was obvious, there were obvious differences of yield, but the increasing rate of the leaf number, the branch numbers and internodes number was significant. The plant height showed obvious difference, plant height increased straightly, there were no differences of the leaf numbers in the reviving period among the 7 treatments, but the differences were obvious from the ramification period to flowering period. For the shoot number there were big differences in the whole growth period among the 7 treatments. There was significant correlation between biomass and plant height.