中文摘要：

以连作黄瓜土壤为研究对象,夏季休闲期设定接种与非接种根瘤菌还田处理,主栽作物时期设定传统施肥、75%施肥、50%施肥裂区试验,系统研究不同处理对土壤速效养分的影响。结果表明,夏季填闲大豆显著增加不同土层pH,降低土壤可溶性盐浓度和速效氮质量分数,且接种优于非接种处理;接种还田50%施肥处理增加秋冬茬土壤pH,降低电导率效果显著;接种还田50%施肥处理黄瓜拉秧期显著增加速效钾质量分数;黄瓜结瓜初期接种还田75%、50%施肥以及非接种还田50%施肥显著增加速效氮质量分数。0-20cm土壤速效磷质量分数显著高于其他土层,填闲非接种大豆增加显著,黄瓜初瓜期和拉秧期接种大豆还田下传统施肥显著增加0-20cm土壤速效磷质量分数。总之,填闲大豆可有效降低夏季休闲期土壤电导率和表层速效氮累积,增加土壤pH,接种根瘤菌大豆还田75%、50%施肥可提供秋冬茬作物较高的速效氮养分。

英文摘要：

The continuous cropping cucumber soil as the research object,the treatments were set straw returning to field in summer with catch cropping soybean inoculated and non-inoculated with nodule bacteria,and setting the traditional fertilization,75% and 50%fertilization treatments during cucumber cultivation,effects of soybean straw returning and fertilization on soil available nutrients were explored.The results showed that summer catch cropping soybean significantly increased soil pH,decreased conductivity and available N mass fraction in catch cropping season,and inoculation rhizobium was better than that of non inoculation rhizobium treatment.The treatment of nodule-inoculated soybean returning and 50% fertilization increased soil pH and decreased conductivity in autumn-winter season,and increased available potassium mass fraetion significantly in seedling stage;in the fruiting period,three treatments,including nodule-inoculated soybean straw returning and 75%and 50%fertilization respectively,and non-inoculated soybean straw returning and 50%fertilization,increased available nitrogen mass fraction significantly.Available phosphorus mass fraction of 0-20 cm soil layer was higher than other soil layers,and which was increased by catching non inoculation rhizobium soybean,and available phosphorus mass fraction of 0-20 cm soil layer was increased in soy-bean returning to field inoculated with rhizobium with traditional fertilization.In short,catch cropping soybean can effectively reduce the summer catch crops soil conductivity and available nitrogen accumulation of free surface,increase soil pH,rhizobium inoculated returning 75% and 50%fertilizer treatments can provide highly available nitrogen nutrient in autumn-winter.