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历史上人们习惯于将乌桕种植在田边、地角,但乌桕耐湿能力有一定限度,单季稻改种双季稻以后,由于积水时间过长,严重影响乌桕生长结实,甚至引起枯死。同时,对水稻生产也有不同程度的影响。因此,黄土丘陵就成了今后发展乌桕的主要场所。但是,黄土丘陵地区肥力不足,营造乌桕如不设法改良土壤,就不能达到速生与丰产。为此,我们于1965年在浙江兰溪工交局乌桕林场,选3年生的乌桕
Historically, people are accustomed to the cultivation of 乌 在 in the fields, land angle, but there is a certain limit Moisture tolerance, single-season rice after double cropping rice, due to prolonged stagnant water, severely affected the growth of 乌 结 or even cause death. At the same time, it also affects rice production in varying degrees. Therefore, the Loess Plateau has become the main site for the future development of black beans. However, due to insufficient fertility in the loess hilly areas, it is impossible to achieve fast-growing and high-yielding crops if it does not seek to improve the soil. To this end, we in 1965 in Zhejiang Lanxi Industrial Park Wuzhuang Forest Farm, the election of three-year-old 桕 桕