The variation of the amount of hybrid sweet sorghum with harvest by stages

multiple crapping 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 tern der plant

showed the more favorable effect than usual one-step-harvest

and one of the stage harvest combnation 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 coukl reach 31.3 t/ hm2

provided 9.3% and 8.3% daily yield incxease of fresh grass more than usual planting and harvest by stages

respectively.Considering that the cultivated area of wheat in Heilongjiang Province was almost 200000 hectares

multiple crapping of wheat stubble would produce 6000000 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.