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建立了菜园系统中施氮量pA（N）、土壤水分w（H2O）［以占田间最大持水量的百分数表示］、土壤肥力w（RAHN）［以土壤还原碱解N（PAHN）水平表示］3因素影响菠菜植株NO3－N含量［w（NO3－N）］的三元二次数学模型．模型分析和盆栽、微区及大田验证试验结果表明：3因素对菠菜植株w（NO3－N）影响的顺序是：pA（N）＞w（RAHN）＞w（H2O）．既能使菠菜高产，又能使植株w（NO3－N）达到国颁限制标准的最佳措施组合是：pA（N）＝130．95～241．35kg·hm－2，土壤w（H2O）＝84％～88％及中等肥力土壤［w（RAHN）＝130～150mg·kg－1］．初步试验表明：模型还可用于对菠菜w（NO3－N）进行预测．
Soil nitrogen content pA (N), soil water w (H2O) [expressed as a percentage of maximum field capacity in the field], soil fertility w (RAHN) [expressed as PAHN levels] Three factors affect spinach plant NO3-N content [w (NO3-N)] ternary quadratic mathematical model. The results of model analysis and pot, microzone and field validation showed that the order of influence of three factors on NO3-N was: pA (N)> w (RAHN)> w (H2O). The best combination of both high spinach yield and plant w (NO3-N) reached the national standard: pA (N) = 130.95 ~ 241.35kg · hm-2, = 84% ~ 88% and moderate soil fertility [w (RAHN) = 130 ~ 150mg · kg-1]. Preliminary experiments show that the model can also be used to predict spinach w (NO3-N).