| Effect of stalk returning and plastic mulching on growth and yield of maize under ridge and furrow planting in dryland |
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| DOI：10.7606/j.issn.1000-7601.2014.03.027 |
| Key Words: completely mulched alternating narrow and wide ridges with furrow planting stalk returning crop growth yield dryland |
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| Abstract: |
| Field experiments were conducted to evaluate the effects of rainwater harvesting technique (whole plastic-film mulching on alternating narrow and wide ridges with furrow planting) in combination with straw returning on soil water content, maize growth, decomposition efficiency of maize straw and yield performance in semi-arid rainfed area of Loess Plateau. A significant dual effect was detected on the relationship between soil water content, crop water requirement and straw water uptake. In particular, a remarkable competitive relation between maize water requirement and straw water absorption was found at the first year after straw return applied into the rain harvesting technique, but at the stage of later maize growth, straw returns increased soil water retention capacity on the planting model of the combination of rain harvesting technique with straw returns. Maize straw returns together with rainwater harvesting technique was used in autumn could harvest a optimal decomposition efficiency of maize straw due to the longer duration of straw returns promote rate of straw decomposition. The rain harvesting technique with straw returns decreased leaf area and stem
diameter to some extent in comparison with rain harvesting technique use only. 4.58%～4.65% of gain yield was loss in the combination of rain harvesting technique with straw returns by compared with rain harvesting technique with no straw returns. Maize grain yield was higher by 4.83% when maize straw returns together with rain harvesting technique was used in autumn than in early spring in spite of no significant difference. Our result revealed that high-producing rain harvesting technique integrated with sustainable straw returns can be expected to improve the soil quality and hence dryland agricultural ecosystem. |
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