【摘要】 探讨了不同肥密因素下分期青刈、麦茬复种与常规种植饲用杂交甜高粱的产量变化。结果表明,常规种植饲用杂交甜高粱,在25种肥密组合中4个组合效果较好者,产量可达59.6 t/hm2以上;相同肥密条件下分期青刈效果优于常规一次性收获,表现产量高,植株鲜嫩。麦茬复种饲用杂交甜高粱在地处寒地的黑龙江是可行的,其最佳肥密组合产量可以达到31.3样t/hm2,日产鲜草量高于常规种植及分期青刈的最高产量组合,达9.3%和8.3%。黑龙江省小麦种植面积近2.00×105hm2,若进行麦茬复种每年可生产优质鲜饲料达6.00×106t,这即能充分利用寒地有限的光温资源,又可减少水土流失,更利于促进畜牧业的发展。更多还原

【Abstract】 The variation of the amount of hybrid sweet sorghum with harvest by stages,multiple cropping of wheat stubble,and usual planting with different kinds of fertilization was studied.Results showed that for hybrid sorghum,for the more favorable combinations,the yield of correlative land was more than 59.6 t/hm2.Under the same condition,the harvest by stages,which provided higher yield and more fresh and tender plant,showed the more favorable effect than usual one-step-harvest,and one of the stage harvest combination provided the highest yield among the ten combinations of different kinds of fertilization and different plant populations.It is operable to plant sequential cropping hybrid sweet sorghum in wheat stubble in the chilly Heilongjiang Province.The best combination of fertilizer and plant population,of which yield could reach 31.3 t/hm2,provided 9.3% and 8.3% daily yield increase of fresh grass more than usual planting and harvest by stages,respectively.Considering that the cultivated area of wheat in Heilongjiang Province was almost 200 000 hectares,multiple cropping of wheat stubble would produce 6 000 000 ton fine quality fresh forage,which can not only take advantage of the limited resources of light and temperature and reduce soil and water loss,but also promote the development of animal husbandry.更多还原