Effect Of Facility Cultivation On The Distribution And Translocation Of Nitrogen In The Soil And Crop System

Facility cultivation, as a widely used agricultural practice in vegetable production worldwide, significantly alters soil hudrothermal properties, for example, conserving soil moisture, modifying soil physical environment, and affecting the forms of elements. Field experiments were conducted in three different planting patterns (plastic film mulching, greenhouse, conventional cultivation) with green vegetables cabbage, lettuce, tomato and cucumber to study effect of plastic film mulching and greenhouse on the distribution and traslocation of nitrogen in the soil and crop system in Fuyang, Zhejiang province.The experiment results showed that available P was decreased by plastic film mulching, increasing crop output. Soil organic matter was decreased by plastic film mulching, which result in soil total nitrogen and the number of ammonifier was decreased. The number of denitrifiers and urease were increased by plastic film mulching. Nitrogen was distributed the most in leaf while the least in root by plastic film mulching. The BCF (the calculated bioaccumulation factor) of total nitrogen of root was decreased, TF1(TF of total nitrogen from root to stem) and TF2(TF of total nitrogen from root to leaf) were increased by plastic film mulching. Soil NO3-N has a negative correlation with crop’s nitrogen content after plastic film mulching, and it may increase NO3-N content or crop’s nitrogen content, then pollute environment and endanger mankind health.Soil moisture was increased by greenhouse. Urease, pH and soil organic matter was decreased by greenhouse, respectively. Organic matter was decreased which resulted in the number of nitrite bacteria and nitrifier was decreased. Soil NO3-N content was increased by greenhouse, and NH4+N has a positive correlation with total nitrogen. Nitrogen was distributed the most in leaf while the least in root by greenhouse. NO3-N was increased by increased by greenhouse. The BCF of total nitrogen of root was decreased, TF1and TF2were decreased by greenhouse. Greenhouse may increase NO3-N content or crop’s nitrogen content(fruit of tomato and cucumber), then pollute environment and endanger mankind health.