Southern root鄄knot nematode, Meloidogyne incognita, is an important pathogen of vegetables, and was first observed in South China. With the development of indoor agricultural facilities, it was found for the first time in Shaanxi in 2000, and now is widely distributed through different ecological vegetable growing zones in Northern and Southern Shaanxi, and the Guanzhong area. M. incognita has become a devastating soilborne disease, causing great economic losses in vegetable production. It survives at soil depths of 5 to 15 cm, and overwinters in the soil as eggs or second instar larvae. Soil temperature is an important factor affecting its overwintering, and this is dependent on climate and plant conditions. Air and soil temperature data for open fields can be obtained from meteorological stations, but soil temperature data for indoor agricultural facilities is not available, and thus mathematical models need to be established to simulate soil temperatures under different cultivation conditions. Each winter ( November to the following March) from 2009 to 2012, air and soil temperatures in four agricultural systems in four ecological regions ( Yanan, Shangluo, Yangling, and Dali) in Shaanxi
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