不同施肥处理下蔬菜塑料大棚土壤微生物活性及功能多样性 Soil Phosphorus Balance and Changes of Olsen-P of Black Soil under Long-term Conventional Fertilization Effects of NDSA fertilization on the N uptake,yield and quality of celery Effects of long-term fertilization modes on spatio-temporal distribution and accumulation of soil nitrate nitrogen in solar greenhouse Evolution characteristics of soil nutrients in the main rice production regions, the middle-lower reach of Yangtze River of China