| 摘要: |
| 【目的】探究宁夏雨养区不同播量拉巴豆（Lablab purpureus（L.） Sweet）与甜高粱（Sorghum dochna (Forssk.) Snowden）混播对草地产量和牧草品质的影响，为宁夏雨养区甜高粱种植提供参考。【方法】采用单因素随机区组设计，以“海牛”甜高粱和“海沃”拉巴豆为研究材料，将甜高粱（22.5 kg/hm2）分别与不同播量（22.5(T1)，45.0(T2)，67.5(T3)和90.0(T4) kg/hm2）的拉巴豆进行混播，并设置单播对照，测定适宜收获期甜高粱农艺性状、混播后豆禾之间地上部分竞争率、混播草地产量和牧草营养成分。【结果】混播会限制甜高粱株高和茎粗的生长，对单株叶片数无显著影响，T3和T4处理1～4节、5～7节茎节强度显著降低，但是混播后饲草干鲜比要高于单播甜高粱。随着拉巴豆混播量的增加,甜高粱对光照和养分的竞争在T2处理下种间竞争力最大，T3处理下种间竞争力最弱，从而导致饲草产量低于甜高粱单播。混播后饲草粗蛋白、粗脂肪、粗灰分含量升高，中性洗涤纤维和酸性洗涤纤维含量降低，经灰色关联度法分析认为，T3处理的牧草粗蛋白和粗脂肪含量高，中性洗涤纤维含量较低，其牧草营养品质最佳。【结论】在宁夏雨养区，甜高粱种植以产量为目的时，单播效果最佳；以牧草品质为目的时，22.5 kg/hm2甜高粱+67.5 kg/hm2拉巴豆混播效果最佳。 |
| 关键词: 拉巴豆 甜高粱 混播 草地产量 牧草品质 宁夏雨养区 |
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| 基金项目:宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)；宁夏固原市科技计划重点研发项目“六盘山地区草产业科技创新技术集成与应用”（2018GYYQ0001） |
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| Effects of mixed planting of Lablab purpureus（L.） sweet and Sorghum dochna (Forssk.) Snowden on grassland yield and quality of forage grass in Ningxia rain fed region |
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YANG Fan,,LIU Zhuo,HAN Xubiao,et al
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| Abstract: |
| 【Objective】This study explored the effects of mixed sowing of Lablab purpureus（L.） Sweet at different seeding rates and Sorghum dochna (Forssk.) Snowden on grassland yield and quality of forage grass in Ningxia rain fed region to provide basis for S. dochna (Forssk.) Snowden cultivation.【Method】Taking a single factor random block design,the mixed planting was conducted with S.dochna (Forssk.) Snowden(Hainiu) (22.5 kg/hm2) and L.purpureus（L.）Sweet(Highworth) (22.5(T1),45.0(T2),67.5(T3) and 90.0(T4) kg/hm2).Unicast was also set for comparison.Then,agronomic traits,yield of mixed sowing grassland and nutrients composition of forage grass of S.dochna (Forssk.) Snowden were measured during suitable harvest time.Competition rates of above ground part of beans and grass after mixing were also determined.【Result】Mixed sowing limited plant height and stem diameter growth of S. dochna (Forssk.) Snowden,while had no significant effect on number of leaves per plant.Lodging resistance of stems 1-4 and 5-7 in T3 and T4 treatments were significantly weakened.However,dry-fresh ratio of mixed forge was higher than that of S. dochna (Forssk.) Snowden.With the increase of mixed sowing density of L. purpureus（L.）Sweet,the competition of S. dochna (Forssk.) Snowden for sunlight and nutrients was the largest with the greatest inter species competitiveness in T2 treatment,T3 treatment had the weakest inter species competitiveness,which led to lower forage production than that of S. dochna (Forssk.) Snowden.After mixed sowing,crude protein,ether extract and ash of forage increased,while NDF and ADF decreased.The grey correlation analysis method showed that the T3 treatment had the highest crude protein and ether extract content,low NDF,and best forage nutritional quality.【Conclusion】In the rain fed region of Ningxia,sole planning of S.dochna (Forssk.) Snowden was the best for high yield,while mixing with L.purpureus（L.） Sweet of 67.5 kg/hm2 was the best for quality of forage grass. |
| Key words: Lablab purpureus（L.） Sweet Sorghum dochna (Forssk.) Snowden mixed sowing yield of grass land quality of forage grass Ningxia rain fed region |
