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根据密度与鲜归产量形成的散点图趋势，用一元二次式ｙ＝ｂ０＋ｂ１ｘ＋ｂ２ｘ２作为密度效应模型，获得的最高产量密度为１０．９万株／ｈｍ２；密度为１０．５万株／ｈｍ２的效益最高，纯收益达３１８６４．５元／ｈｍ
According to the trend of scatter plot formed by density and fresh return production, the highest yield density of 109000 plants / hm2 was obtained by using the quadratic formula y = b0 + b1x + b2x2 as the density effect model; the density was 105000 plants / hm2 The highest efficiency, net income of 31864.5 yuan / hm