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| DOI：10.13522/j.cnki.ggps.2017.0414 |
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| Effect of Drip-irrigation Pipe Arrangement on Distribution of Water and Salt in Soil as Well as the Yield of Asparagus Lettuce under Raised-bed Cultivation |
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ZHANG Zejin, TANG Li, LI Yuejian, LIU Xiaojun
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1. Horticulture Research Institute, Sichuan Academy of Agricultural Sciences/Vegetable Germplasm Innovation and Variety Improvement Key Laboratory of Sichuan Province, Chengdu 610066, China; 2. Key Laboratory of Horticultural Crop Biology and Germplasm Enhancement in Southwest, Ministry of Agriculture, Chengdu 610066, China
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| Abstract: |
| 【Objective】The flow and distribution of water and salt in soil modulate plant growth and this paper studied the effects of arrangement of drip irrigation pipe on water-salt distribution, as well as root activity and the yield of asparagus lettuce grown in raised bed. 【Method】 The variety of Cuiguan asparagus lettuce was used as the model plant; it was planted in raised beds with six drip-irrigation pipe arrangements: 2 pipes in 4 rows (2-4), 2 pipes in 5 rows (2-5), and 2 pipes in 7 rows (2-7). Each arrangement had a plastic-mulch treatment and none-mulch treatment. For each treatment, we measured the distribution of water and salt in the soil at depth of 5 cm, 10 cm and 15 cm depth respectively, as well as the associated root activity and yield of the asparagus lettuce.【Result】The soil moisture content in soil under plastic mulch was significantly higher than that without mulch, the highest in which was in the 2-5 treatment and the lowest in which was in 2-7 treatment. At the depth of 5 cm and 10 cm under the 2-4, 2-5 and 2-7 treatments, the salt content in center of the raised-bed was significantly higher than that in the edge, and the difference between them increased with the width of the raised bed. 【Conclusion】The distribution of water and salt under the 2-5 treatment with mulch is relatively uniform in the soil, benefiting root activity and lettuce yield. |
| Key words: drip irrigation arrangements; distribution of water and salt; root activity; yield |
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