Effects of cucumber continuous cropping on the soil physi-chemical characters and biological activities
黄瓜连作对土壤理化性状及生物活性的影响研究

The effects of cucumber continuous cropping on the soil physi-chemical characters and biology activities were studied through pot and field trials.The results show that cucumber continuous cropping makes the soil secondary salinization heavy;makes the soil nutrition unbalanced,i.e.P is excessive and K content low;and also makes the bacterium-type soil transferred into the epiphyte-type soil,causing the heavy soil root-knot nematode disease,being 4.38 pieces of root-knot nematode in one gram soil.