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油松是辽西干旱地区荒山造林的主要树种,在造林时必须做到“三不离水”.即在起苗前6～7天要灌透底水,使苗木的含水率恢
Pinus tabulaeformis is the main afforestation of afforestation in the arid region of western Liaoning, must be “three not leave the water” when afforestation .In the 6 to 7 days before the seedling to infiltrate the bottom water, the seedling moisture content