黄土塬区主要粮食作物增产潜力分析

研究一个地区的作物生产潜力可以发现提高产量的主要障碍因子 ,为合理进行农业生产规划提供依据。本文以长武试区冬小麦和春玉米为例 ,计算了黄土塬区光温潜力、气候潜力 ,并与实际产量进行比较。结果表明 ,该区光温潜力多年平均值冬小麦为 691 0 .5kg/ hm2 ,春玉米为 1 0 663 .4kg/ hm2 ,年际变化不大 ;气候生产潜力多年平均值冬小麦为 590 4.6kg/ hm2 ,春玉米为 81 48.4kg/ hm2 ,年际波动较大。冬小麦 WCR为 0 .84;春玉米 WCR为 0 .76。试区大田产量冬小麦为旱作产量潜势的 57.7% ,光温潜力的 46.3 % ,春玉米为旱作产量潜势的 82 .8% ,光温潜力的 61 .6% ,还有较大的增产潜力

Simulation of Main Crop Potential Productivity on Loess Plateau

To research the crop potential productivity can find the obstacles of improveing yield and can offer grounds for programming agricultural production.The paper computed the temperature and climate potential productivity of Changwu district of ten years;compared with practical yield,winter wheat and spring maize being put as example.The result show that:the wheat's average heat potential productivity was 6910.5kg/hm+2 in studied ten years of the district ,that of maize was 10663.4kg/hm+2,variance between years was not obvious.The wheat's average climate potential productivity was 5904.6kg/hm+2,that of maize was 8148.4kg/hm+2;variance between years was very large.To winter wheat,TCR was 0.43,WCR 0.84;to spring maize,TCR was 0.54,WCR 0.76.The field yield of winter wheat in the district was only 57.7 percent of rainfed yield potential,46.3 percent of heat potential;that of spring maize was 82.8 percent of frainfed yield potential,61.6 percent of heat potential,so there is a great potential to improve yield.