刈割对元谋干热河谷区海狮苏丹草生长及生产性能的影响

以牧草鲜草产量、再生速度、分蘖数等为观测指标，研究不同刈割处理和刈割茬数对元谋干热河谷区海狮苏丹草Sorghum sudanense(Hay king)Stapf.]生长及生产性能的影响。研究结果表明：海狮苏丹草在干热河谷区具有较好的适应性，在其生长季内可刈割5次；留茬高度和茬数对其再生性能和分蘖能力均有显著影响，其中刈割茬数对其再生速度和分蘖数影响最大，随着刈割茬数增加再生速度显著减慢而分蘖数则明显增加；海狮苏丹草不同留茬高度、刈割茬数对生物量均存在显著差异；就生物量和再生能力来看，海狮苏丹草留茬高度

Effect of Mowing on Growth and Production Performance of Sorghum sudanense(Hay king)Stapf. in Dry-hot Valley of Yuanmou County

The present paper was intended to use the fresh forage yield, regeneration rate and number of tillers as the major observation indexes for studying the effect of different cutting stubble handlings and mowing times on growth and production performance of Sorghum sudanense (hay king) stapf. in dry-hot valley of Yuanmou County. The results showed that the grass has a good adaptability in the dry valley area and can be gotten 5 times in its growing season; different cutting stubble handlings and mowing times are significant affect the ability of regeneration and tiller and the second one is the greatest impact. The increasing number of mowing stubble times significantly slow down the regeneration rate and significantly enhance the number of tillers by contraries; the grass has a difference significantly in up-ground biomass between any two groups from different stubble heights and mowing stubble times; for the measurements of total yield and regeneration rate, the mowing handling treatment of 10cm stubble height is the best choice, which can make the average recycling rate up to 2.50cm/d and fresh yield 125 760.6 kg/hm2, also this stubble height showed a more stable biomass in different mowed periods and remain a more sustainable growth ability in its reason.