| Effects of aerated drip irrigation and nitrogen application on physiological characteristics, yield and nitrogen uptake and utilization in salt\|stressed cotton |
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| DOI：10.7606/j.issn.1000-7601.2025.02.05 |
| Key Words: otton aerated drip irrigation salt stress nitrogen application growth nitrogen fertilizer utilization |
| Author Name | Affiliation | | WANG Jiujiu | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, Northwest A&F University, Yangling,Shaanxi 712100, China | | NIU Wenquan | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Ministry of Water Resources, Chinese Academy of Sciences, Yangling,Shaanxi 712100, China | | LI Tiantian | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, Northwest A&F University, Yangling,Shaanxi 712100, China | | WANG He | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, Northwest A&F University, Yangling,Shaanxi 712100, China | | LI Yanni | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, Northwest A&F University, Yangling,Shaanxi 712100, China | | DU Yadan | Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, Northwest A&F University, Yangling,Shaanxi 712100, China |
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| Abstract: |
| To investigate the mechanism by which aerated drip irrigation coupled with nitrogen application improves crop tolerance to salt stress, this study employed a randomized bucket trial. The experiment included two salt stress levels, 6.2 dS·m-1 (S1) and 12.3 dS·m-1 (S2), along with five nitrogen (urea) application rates: 0 kg·hm-2 (N0), 100 kg·hm-2 (N1), 200 kg·hm-2 (N2), 300 kg·hm-2 (N3), and 400 kg·hm-2 (N4). Non\|salted soil, non-aerated irrigation, and conventional nitrogen application (300 kg·hm-2) served as the control (CK). The study analyzed the effects of aerated drip irrigation and nitrogen application on the physiological growth characteristics, yield, and nitrogen uptake and utilization in salt\|stressed cotton.Preliminary results indicated that salt stress significantly reduced photosynthesis and inhibited cotton growth. However, increasing nitrogen application significantly enhanced the net photosynthetic rate (Pn) and dry matter mass by 32.52% to 53.30% and 178.07% to 264.37%, respectively, under the S1 treatment. In contrast, under the S2 treatment, Pn decreased by 13.27% to 47.29%, while dry matter mass increased by 49.79% to 178.72%.The nitrogen content in the roots and stems of the S2 treatment increased by 4.78% to 55.41% and 17.65% to 37.36%, respectively, compared to the S1 treatment, while the nitrogen content in the leaves and bells decreased by 9.21% to 32.86% and 7.39% to 41.87%, respectively. Moderate application of nitrogen under aerated drip irrigation, tailored to soil salinity conditions, could help mitigate the reduction in cotton yield caused by salt stress.Under medium salt stress (6.2 dS·m-1),the highest seed cotton yield was achieved when the nitrogen fertilizer application rate of aerated drip irrigation was 200 kg·hm-2. High salt stress (S2) treatment significantly reduced cotton yield, with no significant difference observed between the nitrogen treatments. Aerated drip irrigation with a low nitrogen application rate (100 kg·hm-2) was applied to maximize yield. |
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