| Influences of technology patterns of enhancing soil organic matter on soil nutrients in Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2017.02.21 |
| Key Words: organic matter straw returning soil fertility significant difference hypothesis test |
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| Abstract: |
| With the data from 75 comparison test sites in 11 regions in Gansu Province, the significant difference hypothesis test and frequency distribution characteristics of soil samples were conducted to evaluate the changes of soil nutrients before and after the implementation of soil organic matter (SOM) enhancing technology. The results showed that the soil organic matter after straw and green manure returning was increased by 0.569 g·kg-1 in average, and the increase rate was 4.43%. Among the 11 regions, 10 reached significant level in the significant difference hypothesis test of soil organic matter content before and after straw or manure returning. Compared with control, the crop yield under straw and manure returning was increased by -1.74% to 15.4%, or 5.2% in average. There was a stable positive correlation between organic matter and total nitrogen, available phosphorus, CEC as well as total phosphorus, thus soil available phosphorus, total phosphorus and CEC tended to increase along with the increase of soil organic matter. The content of soil organic matter in all the comparison test sites showed a partial state of normal distribution, and the peak was partial to high value, so there were more soil samples with increased organic matter under the treatment of straw and green manure returning compared with that under control. Therefore, the measure of straw and green manure returning could increase the content of organic matter and nutrients in plough layer, and improve soil fertility obviously. |
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