水肥耦合对番茄产量和硝酸盐含量的影响

采用二因素(水、肥二因素)二次通用旋转组合设计,研究了水肥耦合技术对番茄产量和硝酸盐含量的影响。结果表明:F回>F0.01(5,7),说明灌水定额、施肥定额二因素与分析项目之间存在极显著的回归关系。2个因素重要性顺序为施肥量>灌水量。根据边际效益分析可知,边际产量随水肥的增加而增加,边际硝酸盐含量随水分增大呈减少趋势,而随着施肥量的增加呈增加趋势。通过计算机模拟,提出了高产、低硝酸盐含量的最优水肥组合方案:灌水指标为2710.95~2735.25m3/hm2,施肥指标:尿素或磷酸一铵的用量为264.6~280.5 kg/hm2。

Coupling Effect of Water and Fertilizer on Tomato Yield and Nitrate Content

The quadratic general rotation combination design with two factors(water and fertil-izer) was used to study the effects of water-fertilizer interaction technology on the yield and nitrate content of tomato in Greenhouse.The result indicated:F>F0.01(5,7),regression is reliable,presenting the regression relation between the two factors(water quota and fertilizer quota) and analysis items.The significance of fertilizer was bigger than that of water.By analyzing the limit benefit,the limit yield increased with the addition of water and fertilizer,but the limit nitrate content decreased with the addition of water and increased with the addition of fertilizer.By means of computer analysis,the optimal combination scheme for high yield and low nitrate content was obtained: the index of water and fertilizer was 2710.95-2735.25m3/ha and 264.6-280.5kg/ha,respectively.