论文部分内容阅读
美国黑核桃属果材兼用树种,并具有绿化、美化、防护效能。其材质细腻优良,果仁风味隽美。在美国每立方米木材售价400美元,每公斤坚果6美元,经济价值很高。近年来经各地引进栽培试验表明,生长良好,适宜发展。1 地块的选择美国黑核桃喜肥沃深厚、排水良好的沙质壤土,不耐水湿。要选择土层厚度2m以
American black walnut fruit tree species, and has greening, landscaping, protective effectiveness. The material is fine and exquisite, nut flavor Jun Mei. In the United States, it costs $ 400 per cubic meter of lumber and $ 6 per kilogram of nut, which is of high economic value. In recent years, the introduction of cultivation tests all over the country have shown that the growth is good and suitable for development. 1 plots of choice American black walnut hi fertile deep, well-drained sandy loam, water wet. To choose the thickness of 2m soil