| The spatio-temporal variation of nitric nitrogen in protected vegetable soils in different years of cultivation |
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| DOI：10.7606/j.issn.1000-7601.2011.02.27 |
| Key Words: greenhouse soil nitric nitrogen salinization |
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| Abstract: |
| This paper analyses the spatio-temporal variation of nitric nitrogen in the greenhouse soil in different
years of cultivation in Qinghai，and determines that the content of nitric nitrogen in 0~100 cm layer and the fundamental property in 0~20 cm layer of protected vegetable soils varied obviously in different years of cultivation. Along with the years of cultivation from 2~27 a, the content of nitric nitrogen in greenhouse soils ranged from 99.09~609.065 mg/ kg in 0~100 cm layer and 37.51~545.545 mg/kg in 0~20 cm layer. The pH value was dropped (8.1~7.7) by culti-vated years while content of salt was increased (0.137%~0.671%). The content of nitric nitrogen in greenhouse soil rend to increase along with the years of cultivation, peaked at 22 a(609.065 mg/ kg). The nitric nitrogen accumulation was obvious on top soil. The spatiotemporal variation of nitric nitrogen in protected vegetable soils in different years of cultivation is obvious. |