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一、京郊菜园土壤的肥力特征京郊种菜历史悠久,菜田面积较大。随着城建的扩展,有很多老菜地被占(指种菜30年以上菜地)。目前全市近郊23万亩菜地大部分是近二、三十年才改种蔬菜的。由于种菜时间较短和熟化程度不同,各种菜地土壤肥力性状差异很大。其中分布在近城区的老菜地产量最高,是本市主要蔬菜生产基地,其肥力特征是:
First, suburban garden soil fertility characteristics Beijing suburbs of vegetables has a long history, larger vegetable fields. With the expansion of urban construction, there are many old vegetables are occupied (referring to vegetables more than 30 years). At present, most of the 230,000 mu of vegetable fields in the suburbs of the city are almost two or three decades old only with vegetables. Due to the short planting time and the degree of maturation, the soil fertility traits vary widely in various vegetable fields. The distribution of vegetables in the vicinity of the city the highest yield, is the city’s main vegetable production base, the fertility characteristics are: