| Impact of nitrogen fertilization on evolution of dry soil layer in field of dry-land wheat on Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2013.04.028 |
| Key Words: dry-land dry soil layer nitrogen fertilizer soil moisture |
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| Abstract: |
| Basing on the long-term observation data in Changwu County, Shaanxi Provinve, the influence of different nitrogen rates (0, 45, 90, 135, 180 kg·hm-2) on soil moisture and evolution of dry soil layer in field of winter wheat was studied. The results showed that the depth of dry soil
layer was approximately in the range of 50～260 cm. When nitrogen rate was less than 90 kg·hm-2 the soil water consumption intensity of nitrogen fertilization and the variation of dry layer depth were small; when nitrogen rate exceeded 90 kg·hm-2, the average soil water consumption intensity of nitrogen fertilization became relatively high, but there was no significant change in dry layer depth. The increase speed of dry layer thickness increased along with the
increase of nitrogen rate. The high precipitation in wet years could relieve soil desiccation and reduce dry layer thickness to some extent. |
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