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分别测定了泾惠灌区 0～ 2 0 cm、2 0～ 50 cm土层 36个作物种植点的土壤有机质、全氮、全磷含量 ,1 8个作物种植点的速效养分含量。结果表明 ,泾惠灌区 0～ 2 0 cm、2 0～50 cm土层中有机质、全氮、全磷含量分别为 1 0 .62± 0 .36,6.0 3± 0 .0 6;0 .90± 0 .0 2 ,0 .60±0 .0 3和 1 .74± 0 .1 0 ,1 .58± 1 .45g/kg。全磷含量较高 ,有机质、全氮含量较低。速效养分的供应状况为 K>P>N,约 80 %的土壤出现潜在性缺钾 ,83%的土壤速效磷含量较低或缺乏 ,88%的土壤速效氮较低或缺乏。对应该研究 ,应用聚类分析得出了高、中、低土壤肥力类型 ,有机质、全氮、全磷、速效钾含量范围分别为 :≥ 1 2 ,≥ 1 .0 ,≥ 2 .0 g/kg和≥ 1 50 μg/g;1 0～ 1 2 ,0 .8～ 1 .0 ,1 .5～ 2 .0 g/kg和 1 2 0～ 1 50μg/g;≤ 1 0 ,≤ 0 .8,≤ 1 .5g/kg和≤ 1 2 0μg/g。
The contents of soil organic matter, total nitrogen and total phosphorus, and available nutrients of 18 crops at 36 planting sites in 0 ~ 20 cm and 20 ~ 50 cm soil layers in Jinghui irrigation area were measured respectively. The results showed that the contents of organic matter, total nitrogen and total phosphorus in 0 ~ 20 cm and 20 ~ 50 cm layers in Jinghui irrigation area were respectively 10.62 ± 0.36, 6.03 ± 0.06 and 0.90 ± 0 .0 2, 0 .60 ± 0 .0 3 and 1 .74 ± 0 .1 0, 1 .58 ± 1 .45 g / kg. Total phosphorus content is higher, organic matter, total nitrogen content is lower. About 80% of the soil had potential potassium deficiency, 83% of soil available phosphorus was low or deficient, and 88% of the soil available nitrogen was low or absent. According to the study, the soil types of high, medium and low soil fertility were obtained by cluster analysis. The ranges of organic matter, total nitrogen, total phosphorus and available potassium were as follows: ≥12, ≥1.0, ≥2.0 g / kg and ≥150 μg / g; 100-120, 0.8-1.0, 1.5-2.0 g / kg, and 120-250 μg / g; 8, ≤ 1.5 g / kg, and ≤ 120 μg / g.