| Effects of drip irrigation with brackish water under film mulch on salinity, nutrients and quality of cotton plants |
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| DOI：10.7606/j.issn.1000-7601.2020.04.16 |
| Key Words: brackish water cotton salt nutrient the quality of cotton |
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| Abstract: |
| In order to alleviate the shortage of fresh water resources in southern Xinjiang and make full use of brackish water resources, an experiment with different mixing ratios of fresh and brackish water were conducted. Six ratios of fresh water and brackish water were 1∶0 (control), 4∶1 (treatment 1), 3∶2 (treatment 2), 2∶3 (treatment 3), 1∶4 (treatment 4) and 0∶1 (treatment 5). The field experiments were conducted to study the effects of different proportion of brackish water on salinity, nutrient, and quality of cotton plants. The results showed that: (1) With the increase of salinity of irrigation water, Na+ content in different organs of cotton showed an increasing trend; the content of Na+ in leaves was the highest in different organs, and the levels of Na+ in leaves increased by 8.29%, 32.49%, 32.87%, 42.62% and 48.05%, respectively, when compared with the control group. The content of Cl- in different organs increased with the increase of salinity of irrigation water. The highest content of Cl- was found in leaves, followed by buds and bolls and stems, and the lowest in roots. The Ca2+ content in different organs decreased with the increase of salinity, but there was no significant difference among the treatments. With the increase of salinity, the Na+ and Cl-1 accumulation of cotton per plant fluctuated, in which the Na+ accumulation ranged from 0.42 g·plant-1 to 0.51 g·plant-1, and the Cl- accumulation ranged from 1.45 g·plant-1 to 2.06 g·plant-1. The accumulation of Ca2+ in cotton per plant decreased with the increase of salinity, and the values of treatment 1~5 decreased by 23.59%, 21.92%, 25.81%, 42.94%, and 48.22%, compared with the control group. (2) The content of nitrogen and potassium in different organs of cotton changed irregularly with the increase of salinity; the content of phosphorus in stems, leaves, buds and bolls of cotton first increased and then decreased, while the content of phosphorus in roots decreased with the increase of salinity, but there was no significant difference among the treatments. The accumulation of nitrogen and phosphorus per plant of cotton decreased with the increase of mineralization degree. The nitrogen accumulation per plant of treatment 3～5 was significantly different from that of control, treatment 1 and 2. The total potassium accumulation of cotton in control and treatment 1～5 was 7.79, 6.57, 5.97, 5.74 g·plant-1 and 5.01 g·plant-1, respectively. With the increase of irrigation water salinity, the phosphorus accumulation per plant of cotton decreased significantly, which decreased by 15.83%, 34.56%, 35.22%, 48.73% and 59.22% respectively compared with the control. Treatment 1 had the smallest decrease compared with the control.（3）With the increase of salinity, the short fiber index of cotton increased in different degrees, the short fiber index of control and treatment 1～5 were 5.70, 6.30, 6.40, 7.60, 7.45 and 7.65, but the difference was not significant. Compared with the control, other qualities decreased to different degrees. Overall, the quality of cotton decreased with the increase of salinity. Therefore, when the brackish water ratio was 4∶1, that is, the salinity was 2.36～3.39 g·L-1, the salt accumulation in the cotton body was low, and the effect on nutrient absorption and quality was minimal. |
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