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采用L16(45)正交试验设计,研究了喀斯特地区桂牧1号杂交象草光合生理特性、产量和品质对不同施氮水平、刈割次数、刈割强度的响应。结果表明,施用氮肥显著增加了桂牧1号杂交象草的叶绿素a、b和叶绿素总含量、净光合速率、产量及营养成分含量,肥效最佳水平是1000kg·hm-2·a-1。刈割次数显著影响桂牧1号杂交象草的净光合速率、叶绿素含量和牧草营养成分含量,刈割过2～3次,桂牧1号光合作用能力显著提高,而每年刈割3～4次,牧草的营养品质最优。刈割强度对粗蛋白含量影响显著,对其他营养成分含量和产量均无显著影响,以5或20cm刈割强度为最优。综合各指标结果,提出了喀斯特地区栽培桂牧1号杂交象草获得高产优质的最优方案,即施氮1000kg·hm-2·a-1,刈割牧草3次,刈割强度为5或20cm。
Using L16 (45) orthogonal experimental design, the photosynthetic physiological characteristics, yield and quality of hybrid grass of Guimai 1 in karst area were studied in response to different N application rates, mowing times and mowing intensities. The results showed that the application of nitrogen fertilizer significantly increased the content of chlorophyll a, b and total chlorophyll, net photosynthetic rate, yield and nutrient content of Guiyu 1 hybrid grass. The best fertilizer efficiency was 1000 kg · hm-2 · a-1. The number of mowing significantly affected the net photosynthetic rate, chlorophyll content and forage nutrient content of the hybrid grass of Gui Mu 1, mowing 2 or 3 times, and the photosynthesis ability of Gui Mu 1 significantly increased, but the mowing rate of 3 ~ 4 Times, the best nutritional quality of forage. The mowing strength had a significant effect on the crude protein content, but had no significant effect on other nutrient contents and yield, and the optimum cutting strength was 5 or 20 cm. According to the results of each indicator, the optimal plan for high yield and good quality of hybrid grass of Gui Mu No. 1 in karst area was put forward, that is, nitrogen application was 1000 kg · hm-2 · a-1, mowing grass was 3 times, cutting strength was 5 or 20cm.