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| Effects of pretreated straws on soil evaporation and straw decomposition rate |
| Wang Zengli1,2, Wang Zhen1, Feng Hao1,3 |
| 1.Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Wuwei Integrated Service Centre on Water Conservancy Technologies of China, Wuwei, Gansu 733000, China; 3. Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China |
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Abstract Effects of the pulverized and ammoniated straw on soil evaporation and decomposition rate of straw were investigated comparatively through indoor soil column experiments. The results showed that after straws was applied in soil, its cumulative evaporation was raised in great deal, but the powdered and ammoniated straws could decrease the evaporation considerably. Additionally, if they were mixed with other inorganic soil amendments and applied in soil, an even significant reduction in the evaporation could be achieved and soil drought tolerance was improved. When the long or powdered straws were applied in soil alone, the percentage of water loss(pwl)by evaporation was increased substantially. The pulverized and ammoniated straws could reduce pwl. Interestingly, once they were blended with inorganic soil conditioner and fertilized, the time period without soil evaporation was extended. The decomposition climax of straw mainly occurred in 30 days. In short term the length of straws had a little effect on decomposition rate; the pulverized and ammoniated straws increased the rate remarkably. There are significantly correlations between the evaporation indices, such as cumulative evaporation, rate of evaporation, pwl, so that they can better characterize soil evaporation feature.
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Received: 15 November 2012
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