Effects of moisture on nitrogen mineralization in soils under solar greenhouses in different cultivation years
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DOI:10.7606/j.issn.1000-7601.2019.04.17
Key Words: solar greenhouse  soil moisture  soil N mineralization  cultivation years
Author NameAffiliation
WANG Shi-chao College of Natural Resources & Environment/Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712700, China 
CHEN Zhu-jun College of Natural Resources & Environment/Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712700, China 
ZHOU Jian-bin College of Natural Resources & Environment/Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712700, China 
LAI Chun-xiang College of Natural Resources & Environment/Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712700, China 
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Abstract:
      Aerobic laboratory incubation method (84 day) was conducted to evaluate the effects of different soil moisture (60%, 80%, and 100% of field capacity) on nitrogen (N) mineralization in 0~20 and 20~40 cm soil layers of different utilization age (0, 2 a, and 3 a) in the solar greenhouses in Yangling, Shannxi. Results showed that the net N mineralization in the 0~20 cm of soil layers increased with the cultivating history, and also increased with soil moisture in the 20~40 cm of soil layers. The net N mineralization increased steadily when the soil moisture increased from 60FC to 80FC, while decreased when the soil moisture reached 100FC. The regression analysis indicated that N mineralization potential (N0) of soils at 60, 80, and 100% of field capacity was increased by 1.62, 1.88, and 4.57 mg·kg-1 when soil organic matter was increased by 1 g·kg-1; and when total N was increased by 1 g·kg-1, the N0 of soils at 60, 80, and 100% of field capacity was increased by 28.93, 33.42, and 27.82 mg·kg-1, respectively. Therefore, the effects of irrigation rate and cultivation history on N mineralization should be considered as factors for solar greenhouse vegetable N fertilizer management.
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