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| DOI：10.13522/j.cnki.ggps.20170046 |
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| Responsive Growth of Seedling and Matured Cotton to Drip Irrigation with Saline Water |
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ZHANG Anqi, ZHENG Chunlian, LI Zongyi, LI Kejiang, CAO Caiyun, LI Quanqi, ZHANG Junpeng
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1. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an 271018, China; 2. Institute of Dryland Farming, Hebei Academy of Agriculture and Forestry Sciences/ Key Laboratory of Crop Drought Resistance Research of Hebei Province, Hengshui 053000, China
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| Abstract: |
| 【Objective】 Increase of salt content in soil irrigated with saline water could inhibit germination and subsequent establishment of crop seedings. This paper aimed to study how to resolve this problem via controlled drip irrigation. 【Method】 We used cotton as the model plant and examined two factors: one was water salinity and the other one was irrigation amount. The salt content in irrigation water was set to be 1, 3, 5, 7 and 9 g/L, and we considered two irrigation amounts to control the soil moisture content at 60% and 70% the field capacity respectively. In each treatment, we measured the germination and subsequent establishment of cotton seedlings in a mulched field under drip irrigation. 【Result】The salt content in 0~30 cm soil layer increased with salinity of the irrigation water, while the soil moisture content in it remained almost unaffected. With the irrigation amount increasing, both soil moisture and soil salt content increased. Compared with the 1 g/L treatment, the 3 g/L treatment boosted the germination with the average seedling establishment rate increasing by 6.06%, while the 5 g/L treatments did not have a noticeable impact on germination with the seedling establishment increasing only by 0.45%. Increasing salt content of the irrigation water to 7 g/L and 9 g/L delayed the germination with the average seedling establishment rate reduced by 3.66% and 12.97% respectively, compared to the control. The growth traits of the seedling showed a trend of decrease as the irrigation amount increased. The average leaf area per plant, stem diameter and dry mass of the seeding changed with water salinity in the rank of 3 g/L>1 g/L>5 g/L>7 g/L >9 g/L under the two irrigation amount treatments. Compared with the 1 g/L treatment, the leaf area, stem diameter and dry mass in the 7 g/L and 9 g/L treatments were significantly reduced. There was a quadratic functional relation between water salinity and the seedling establishment rate, meaning that when salinity of the irrigation water was 6.0 g/L and 8.4 g/L, the relative seedling establishment rate would be 1 and 0.9 respectively. 【Conclusion】 Mulched drip irrigation with saline water of less than 7 g/L has no significant impact on seedling establishment, and the growth of the seedling can be promoted by moderately increasing the irrigation amount and irrigation frequency. |
| Key words: drip irrigation with saline water; cotton; seeding establishment rate; irrigation water salinity; low irrigation amount |
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