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我国核桃生产过去多采用实生繁殖,由于实生苗木遗传基因比较复杂,后代分离较大,不同单株间表现差异较大,结果期早晚可差1～3年甚至7～8年,且产量较低品质较差。为彻底改变这种落后状况,必须从培育优良品种苗木入手,改传统的实生
In the past, the production of walnut in China mainly used the real propagation. Because of the complex genetic material of the seedling and the separation of the offspring, the performance of the different plants varied greatly. The results could differ from one to three years or even seven to eight years, and the yield was low Poor quality. In order to completely change such backwardness, we must start with cultivating seedlings of fine varieties and change traditional ones