| Effect of soil properties and maize yield in different improvement measures of saline-alkali soil in Luyang Lake |
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| DOI：10.7606/j.issn.1000-7601.2019.03.30 |
| Key Words: saline-alkali soil improvement measures soil properties desalination rate economic benefit maize yield |
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| Abstract: |
| In order to select appropriate saline-alkali soil improvement measures, a field experiment was carried out by using agronomic, biological and chemical measures in saline-alkali soil in Luyang Lake of Weinan and provide reasonable basis for saline land improvement. There were nine treatments in the experiment including control, high ridge with mulching film, film mulching, covered straw, bio-organic fertilizer, sheep manure, humic acid gypsum and calcium superphosphate. The results showed that all treatments increased the yield of maize over the control. Sheep manure,humic acid and calcium superphosphate treatments significantly increased maize yield and the increase rates were 15.2%, 16.3%, and 14.6%, respectively. In addition to film mulching treatment, the hundred-grain weight of the other treatments was significantly higher than that of the control in a range of 12.7% to 19.1%. Under different improvement measures, soil nutrients in 0~20 cm layer increased at various degrees, among which the organic matter increased by 0.6%~20.9%, the available nitrogen increased by 30.6%~109.3%, the available phosphorus increased by 4.5%~247.4%, and the available potassium increased by 23.4%~69.2%.The soil pH, total salt content, and sodium content all decreased at some degree. Among them, high ridge with mulching film and sheep manure significantly reduced soil pH, total salt content, and soil Na+. Soil pH was reduced by 2.18% and 2.45% by the two treatments, respectively and desalination rate reached 20.4%, 20.2%, respectively. The economic banefits of high ridge with mulching film, straw-covered and calcium superphosphate treatments increased by 9.44%, 12.88% and 4.87% compared with the control. According to current situation of saline-alkali land in this region, from the perspective of salt-reducing effect, high ridge with mulching film and sheep manure treatment are recommended as the best improvement measures; Comprehensive improvement effects and economic benefits, high ridge with mulching film is the optimal improvement measure. |
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