| This article has been：Browse 1312Times Download 3087Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2021328 |
|
| he Impact of Mulched Drip Fertigation with Saline Water on Uptake of Ions and Nutrients by Cotton |
|
JIANG Zhu, ZHANG Jianghui, BAI Yungang, et al.
|
|
1.College of Hydraulic and Civil Engineering of Xinjiang Agricultural University, Urumqi 830052, China;
2.Xinjiang Research Institute of Water Resources and Hydropower, Urumqi 830049, China;
3.Urumqi Natural Resources Comprehensive Survey Center, Urumqi 830057, China
|
| Abstract: |
| 【Objective】In order to explore the management mode of water, fertilizer and salt under mulched saline water drip irrigation in southern Xinjiang.【Method】Freshwater and saline water were mixed at volumetric ratio of 1∶0, 4∶1 and 2∶3, respectively, for irrigation. For each irrigation treatment, there were three nitrogen applications: 400 kg/hm2 (over applied), 300 kg/hm2 (used by local farmers) and 200 kg/hm2. Freshwater irrigation combined with 300 kg/hm2 of N fertilization was taken as the control. During the experiment, we measured the uptake of ions and nutrients by the crop, as well as dry matter distribution and accumulation【Result】With the increase in irrigation water salinity, the amounts of ions (Na+, Cl- and Ca2+) taken up by the cotton increased, especially Na+ and Cl- . Most of these ions were found in leaves, followed by stems. Increasing irrigation water salinity reduced the uptake of N, P and K, while increasing nitrogen fertilization promoted dry matter accumulation in the roots and uptake of nutrients and ions, thereby boosting plant growth. It was found that increasing nitrogen fertilization enhanced absorption of Na+ and Cl- by the cotton. A moderate accumulation of Na+ and Cl- in stems and leaves associated with 4∶1 of freshwater and saline water suppressed vegetative growth and distributed more nutrients to the buds and bolls, thereby leading to a yield increase. However, over-adsorption of Na+ and Cl- by the crop due to the increase in portion of the saline water could inhibit nutrient uptake and its translocation to the reproductive organs, leading to a yield reduction. Compared with CK, mixing freshwater and saline water at 4∶1 ratio combined with high nitrogen fertilization increased dry matter accumulation by 1.5% without compromising yield (6 829.80 kg/hm2).【Conclusion】Mixing freshwater and saline water at 4∶1 combined with an increase in nitrogen fertilization can promote uptake of ions and nutrients by the crop, as well as translation of dry matter to reproductive organs, without compromising cotton yield. It can thus be used as a guidance for cotton production in southern Xinjiang, China. |
| Key words: cotton; mulched drip irrigation; salt water; salt ions; nutrient uptake; dry matter distribution |
|
|
