种植密度对不同生育时期罗布白麻生长与叶片饲用品质的影响

Effect of Planting Density on Growth and Leaf Feeding Quality of Apocynum Hendersonii at Different Growth Stages

为探究种植密度对新疆维吾尔自治区巴音郭楞蒙古自治州尉犁县不同生育时期罗布白麻(Apocynum hendersonii)植株生长与叶片饲用营养品质的影响,研究设置了3060、4335、6375株/hm^(2)三个种植密度,测定分析了生长期、盛花期、结荚期罗布白麻的株高、叶长等农艺性状及其中部叶片粗蛋白、中性洗涤纤维和酸性洗涤纤维等饲用价值指标;结果表明:随着种植密度的增加,罗布白麻的株高、叶长、叶宽、冠幅和叶产量均呈增加趋势,而茎粗、叶片粗蛋白、酸性洗涤纤维、中性洗涤纤维含量呈降低趋势;随着生育期的推进,叶片粗蛋白、酸性洗涤纤维、中性洗涤纤维含量呈降低趋势;综合考虑产量和叶片饲喂品质,研究认为,新疆维吾尔自治区巴音郭楞蒙古自治州尉犁县罗布白麻用于饲草料生产的最佳采收期为盛花期,宜采用6000~6500株/hm^(2)的种植密度。

In order to investigate the effect of planting density on the plant growth and leaf forage nu-trient quality of Apocynum hendersonii at different growth stages in Yuli County,Bayin′guol Mongolia Au-tonomous Prefecture,Xinjiang Uygur Autonomous Region,the study was set up with three planting densi-ties of 3060,4335 and 6375 plants/hm^(2).Agronomic traits such as plant height and leaf length of Apocynum hendersonii at growing,flowering and podding stages and its feeding value indexes such as crude protein,neutral detergent fiber and acid detergent fiber of central leaves were determined and analyzed.The results showed that plant height,leaf length,leaf width,crown width and leaf yield of Apocynum hendersonii tended to increase with increasing planting density,while stem thickness,leaf crude protein,acid detergent fiber,and neutral detergent fiber content tended to decrease with increasing planting den-sity.Leaf crude protein,acid detergent fiber,and neutral detergent fiber contents tended to decrease as fertility progressed.Taking yield and leaf feeding quality into consideration,this study concluded that the optimal harvesting period for Apocynum hendersonii for forage production in Yuli County,Bayin′guol Mongolia Autonomous Prefecture,Xinjiang Uygur Autonomous Region,is the blooming period,and planting densities of 6000-6500 plants/hm^(2) are appropriate.