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| Effects of degradable film degradation properties on soil temperature, moisture, and maize yield |
| Received:April 06, 2017 |
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| KeyWord:films;degradable;soil temperature;soil moisture;maize;yield |
| Author Name | Affiliation | E-mail | | TANG Wen-xue | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | MA Zhong-ming | Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | mazhming@163.com |
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| Abstract: |
| With the aim of selecting a degradable plastic film suitable for maize production in the Hexi irrigation area, degradable films with different degradation properties were compared with respect to their effects on soil warming, soil moisture, and maize yield. The results were compared to the effects of plastic film in an open-field experiment conducted from April 2015 to March 2017 in the Hexi irrigation area. The results showed that the degradation rates of the degradable mulch films were different. The degradation rate of test film A was the slowest, and the weight-decreasing rate was only 12.3% at 170 days. However, the degradation rates of test films B and C increased sharply after 120 days, and the weight-decreasing rate was 82.4% and 91.4% at 170 days, respectively. Moreover, the degradation properties of each degradation film were relatively stable and repeatable. The three kinds of degradation films showed significant soil moisture preservation properties, and the soil moisture preservation decreased with an increase of the degradation degree of the film. In the seedling stage, at the 0~120 cm soil layer, the water consumption of test film A decreased by 6.4% compared to that of the ordinary film, while that of test films B and C increased by 5.2% and 6.5%, respectively. In the maturation stage, the water consumption of test films A, B, and C was 8.8%, 9.5%, and 11.2% higher than that of the ordinary film, respectively. Degradable film mulching could significantly increase the soil temperature at 0 to 15 cm in the seedling and jointing stages. The soil temperature of test films A, B, and C was reduced by 0.5℃, 1.5℃, and 1.4℃, respectively, compared with the ordinary film. The yield of the three kinds of degradation films was significantly higher than that of the control by 42.2%, 37.1%, and 38.3%, respectively. Compared with the ordinary film, the yield of test film A increased by 0.6%, whereas those of test films B and C decreased by 3.0% and 2.2%, respectively. Based on these results, test film A showed a good effect on temperature increase and soil moisture preservation, and although the yield of maize was the highest, the degradation effect was the worst. Test films B and C also showed good effects on temperature increase and soil moisture preservation, which can meet the temperature and moisture demands of crops, and were beneficial to the growth and development of maize with an increase of yield. Moreover, the degradation rate was accelerated and the degradation effect was good. Test films B and C could be applied to agriculture instead of plastic film. |
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