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| DOI：10.13522/j.cnki.ggps.20170039 |
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| Soil Respiration and Water Use Efficiency of Corn Field Under Conservative Tillage with and Without Straw Incorporation |
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GUO Qiang, YU Lingling, HAN Jingran
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1. Tangshan Academy of Agricultural Science, Tangshan 063001, China; 2.Tangshan Crop Seed Management Testing Stations, Tangshan 063001, China; 3.Kalaqin Agriculture and Animal Husbandry Bureau, Chifeng 024400, China
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| Abstract: |
| 【Objective】Tillage affects soil functions and water use efficiency. This paper aimed to explore how yield, water use efficiency and soil reposition of a corn field varied with different tillage and agronomic managements .【Method】The experiment investigated six conservative tillages: no-tillage with straw incorporation (NTS), rotary tillage with straw incorporation (RTS), ploughing tillage with straw incorporation (PTS), no-tillage without straw incorporation (NT), rotary tillage without straw incorporation(RT) and ploughing tillage without straw incorporation (PT). Soil respiration, soil water and temperature, soil microbial activity, water use efficiency and yield of the corn were measured in each treatment. 【Result】 From May 30 to August 15 in 2017, soil respiration in all treatments increased first and then decreased. During the experiment, PTS had the highest average soil respiration rate at 450.4 mg/(m2·h), while NT had the lowest at 279.6 mg/(m2·h). The correlation between soil moisture and soil respiration rate was highest under ploughing tillage at 0.86, followed by rotary tillage, with the lowest under no-tillage. The correlation between soil temperature and soil respiration was the highest for no-tillage at 0.78, followed by rotary tillage, with the ploughing tillage having the lowest correlation. The correlation between soil bacteria, actinomycetes and the soil respiration rate was 0.94 and 0.97, respectively. In all treatments, water use efficiency under straw incorporation was higher than that without straw incorporation. PTS had the highest water use efficiency and yield, which were 28.3 kg/mm and 10.51 t/hm2 respectively. 【Conclusion】 PTS treatment is the most appropriate for increasing yield and water use efficiency of the corn field. |
| Key words: maize; conservation tillage; soil respiration; microorganism; yield; water use efficiency |
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