Title: Effect of Subsurface Irrigation Quota on Soil Organic Matter and Nitrogen Forms in Protected Field
Abstract: The effect of subsurface irrigation scheduling on soil N forms and their profile distribution was studied in a protected field for determining the content of soil organic matter,total N,inorganic N and soil organic N.The same irrigation experiment was conducted for seven years and soils were sampled at different depths within 0~60cm.Results showed that soil organic matter decreased with layer depth changed from 12.83 to 17.18g·kg-1.At the depth of 0~10cm,the contents of soil organic matter in the treatments of 40kPa and 63kPa were lower than those in other treatments,however,the content in the treatment of 10kPa was lower than that in other treatments at the depth of 30~40cm.Soil total N,NO3——N,NH4+-N and organic N changed from 1.22 to 1.70g·kg-1,10.00 to 161.59mg·kg-1,6.07 to 13.94mg·kg-1 and 1201.74 to 1602.53mg·kg-1 respectively.Soil total N and organic N decreased with the increase of the layer depth.The content of Soil total N at the depth of 10~30cm and the content of organic N at the depth of 0~30cm in the treatment of 63kPa were higher than those in other treatments.There were significant differences in soil NO3——N at the depth of 0~20cm with the highest content in the treatment of 25kPa and the lowest content in the treatment of 63kPa.With consideration of saving water,ensuring tomato yield,avoiding soil organic matter reduced and nitrogen forms accumulated excessively etc,soil water suction should be controlled between 16kPa and 25kPa with the pipe under 30cm soil depth.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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