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一、前言 我国核桃生产多少年来沿用实生繁殖,结果晚,产量低,收益慢,严重影响核桃的迅速发展。法国核桃园5—6年开始结果,10—15年平均亩产340斤,小面积高产记录可达533斤;美国全国栽培核桃105万亩,平均亩产286斤核桃。但早期丰产尚未见到报导.国内绝大部分地区核桃零星栽植、
I. Preface The production of walnut in our country has been used for reproduction for many years. The result is late, the yield is low and the income is slow, which seriously affects the rapid development of walnut. Walnut France 5-6 years results, 10-15 years average yield of 340 pounds, small-scale high-yielding record up to 533 pounds; the United States cultivated walnut 105 acres, an average yield of 286 kg walnut. However, the early harvest has not yet been reported in the country most parts of walnut scattered planting,