为寻求通过改善土壤条件达到控制线虫数量的方法，从2022年5月5日开始在临洮县14个不同玉米种植区域每隔30 d分别测定玉米根际土壤养分含量及线虫数量，分析了土壤线虫随时间的变化规律以及与土壤养分之间的相关性。结果表明，各区域玉米根际土壤中线虫数量随玉米生育期进程而显著升高；各样地土壤养分差异显著，土壤中全氮、有效磷、有效钾和有机质含量与线虫数量表现出一定非线性相关性。综合考虑，可以通过调节土壤养分的含量控制线虫数量，即土壤中有效磷低于40 mg/kg，有效钾的含量低于200 mg/kg，并适量增施氮肥。

To develop a method of controlling the number of nematodes by improving soil conditions, from May 5th, 2022, the nutrient contents and nematode numbers of maize rhizosphere soil were measured every 30 days in 14 different maize planting areas in Lintao County. The changes of soil nematodes with time and the correlation between soil nematodes and soil nutrients were analyzed. Results indicated that the number of nematodes in maize rhizosphere soil increased with the growth period of maize. Significant variations in soil nutrient levels were observed across different soils. Contents of soil total nitrogen, available phosphorus, available potassium, and organic matter exhibited nonlinear correlations with nematode abundance. Overall, nematode populations can be managed by adjusting soil nutrient levels. Specifically, maintaining available phosphorus content below 40 mg/kg, available potassium content below 200 mg/kg, and applying an appropriate amount of nitrogen fertilizer can effectively control nematode numbers.

S513；S154.386

定西市市列科技项目(DX2023BY01)。