| Analysis of grey correlation between conservation tillage modes and corn yield and soil physiochemical properties |
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| DOI：10.7606/j.issn.1000-7601.2011.04.38 |
| Key Words: returning stalk to field conservation tillage soil physiochemical properties organic matter analysis of grey correlation |
| Author Name | Affiliation | | ZHAO Fan | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China | | HE Xiuyun | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China | | SHEN Yumei | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China | | NIU Jianbiao | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China | | LI Jianping | Farm Machinery Administration Station of Yuzhong County, Yuzhong, Gansu 730100, China | | LI Shengke | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China | | ZHANG Jizu | Agricultural Extension Center of Yuzhong County, Yuzhong, Gansu 730100, China |
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| Abstract: |
| Through continious experiments of conservation tillage of returning corn stalk to field in arid areas of central Gansu, study was conducted on gray relativity between corn yield and the lasting years of the tillage and soil physiochemical properties, and regression analysis was also made of fertility factors which had high degree of correlation with soil organic matter. The results showed that 2～6 year conservation tillage could increase corn yield by 2.63%～6.08%. The order of degree of correlation between soil physiochemical properties a
nd yield increase is organic matter (0.7456) > total N (0.706) > available K (0.6495) > available N (0.5977) > available P (0.5712) > pH (0.5134). The content of s
oil organic matter tended to increas with the elongation of tillage years, with an annual increase of 3.894%. The content of organic matter had high degree of grey correlation and positive relation with available K, available P, available Zn and availabe Cu. Returning corn stalk to field, the conservation tillage helped increase the content of organic matter in soil, which had significant effect on improving soil fertility and maintaining high and stable yield of crops. |
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