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| DOI：10.13522/j.cnki.ggps.2024308 |
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| Influence of sowing methods and irrigation strategies on cotton growth and soil nutrient dynamics |
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WANG Juanhong, CHE Qingxuan, ZHOU Leru, MA Yue, WU Yuwen, WU Xiaoqian, CHEN Bolang
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1. College of Resources and Environment, Xinjiang Agricultural University, Urumqi 8300522, China;
2. Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China
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| Abstract: |
| 【Objective】Cotton is a commercial crop in southern Xinjiang and its production relies heavily on irrigation. This study investigates the effects of sowing methods and irrigation strategies on cotton seed germination, subsequent growth, nutrient dynamics and uptake, as well as cotton yield.【Method】The experiment was conducted in a cotton field with film mulching and drip irrigation using both freshwater and saline water. In the experiment, we compared three sowing methods: Winter irrigation combined with seedling-emergence-assistant irrigation (T1); sowing in dry soil followed by seedling-emergence-assistant irrigation (T2), sowing in dry soil amended with fulvic acid, followed by seedling-emergence-assistant irrigation (T3). For each sowing method, there were three irrigation treatments: Irrigating six times using freshwater (I1), irrigating six times with freshwater and two times with saline water (I2), irrigating eight times with freshwater. Overall, there were nine treatments. During the experiment, we measured soil water and salt dynamics, seedling emergence rate, cotton yield, nutrient uptake and dynamics, dry matter accumulation, as well as changes in contents of nitrogen, phosphorus and potassium in the soils.【Result】Compared with T1, on average, T3 increased seedling emergence rate and soil moisture content at the seedling stage by 13.56%, 13.66%, respectively, while reducing soil solution electrical conductivity by 11.53%. Compared with I1, on average, I2 increased dry matter accumulation, nitrogen, phosphorus and potassium uptake, cotton yield, soil moisture content and soil solution electrical conductivity by 9.81%, 3.79%, 7.63%, 4.94%, 10.13%, 3.49% and 3.22%, respectively. Compared with I3, on average, I2 reduced the dry matter accumulation, nitrogen, phosphorus and potassium uptake, cotton yield and soil moisture content of the topsoil by 6.24%, 9.91%, 3.76%, 6.66%, 4.87% and 3.31%, respectively, while increasing soil solution electrical conductivity by 9.29%.【Conclusion】Under the low-temperature and high-salinity conditions in southern Xinjiang, dry sowing with fulvic acid amendment can reduce topsoil salinity and enhance seedling emergence. Under seasonal freshwater shortages, supplemental irrigation with saline water can maintain cotton growth and stabilize yield. |
| Key words: dry sowing and wet extraction; saline irrigation; seedling emergence rate; yield; nutrient absorption; dry matter accumulation |
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