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1975—1979年,在延安地区吴旗县进行的飞播、人工撒播造林种草试验表明,不同树、草种飞播后,出苗、成苗效果显然不同(见表1)。产生不同效果的主要原因,
From 1975 to 1979, the aerial seeding and artificial seeding of grass planting grass in Wuqi County, Yan’an Prefecture showed that the effect of emergence and seedling apparently differed after the planting of different trees and grasses (Table 1). The main reason for different effects,