种植密度对春大豆茎杆饲用营养价值的影响

目的]为提高北疆高产春大豆的综合利用价值提供理论依据。方法]对3种种植密度下春大豆的茎杆饲用营养价值进行了分析。结果]种植密度从30.0万株/hm2增加到60.0万株/hm2时,茎杆产量增加26.57%,粗蛋白质、酸性洗涤纤维、中性洗涤纤维、酸性洗涤木质素、酸不溶性灰分、纤维素和半纤维素含量分别降低71.28%、3.19%、3.26%、7.54%、9.21%、1.91%和3.43%,粗蛋白质单位面积产量降低63.65%,酸性洗涤纤维、中性洗涤纤维、纤维素、半纤维素、酸性洗涤木质素和酸不溶性灰分产量分别增加22.53%、22.44%、24.15%、22.24%、17.03%和14.89%。结论]综合考虑北疆高产春大豆的籽粒产量、饲用营养成分含量和产量,最能利用其优势的种植密度为45.0万株/hm2。

Study on the Influence of Planting Density on the Forage Nutritive Value of Spring Soybean Stalk

Objective]The purpose was to supply theoretical foundation for enhancing the synthetic utilization value of high-yield spring soybean in northern Xinjiang.Method]The forage nutritive values of spring soybean stalk under 3 planting densities were analyzed.Result]When the planting density increased from 3.00×105 plants/hm2 to 6.00×105 plants/hm2,the stalk yield increased 26.57%,the contents of crude protein(CP),acid detergent fiber (ADF),neutral detergent fiber(NDF),acid detergent lignin(ADL),acid indiscerptible ashes(AIA),cellulose and hemicellulose reduced 71.28%,3.19%,3.26%,7.54%,9.21%,1.91% and 3.43% resp.,the yield per unit area of CP reduced 63.65%,the yields of ADF,NDF,cellulose,hemicellulose,ADL and AIA increased 22.53%,22.44%,24.15%,22.24%,17.03% and 14.89% resp.Conclusion]Considering the grain yield and the content and yield of forage nutritive components of high-yield spring soybean in northern Xinjiang comprehensively,the planting density making most use of its potential was 4.50×105 plants/hm2.