Abstract
Abstract Magnetized water treatment technology is usually used to improve poor quality water, and there is still a lack of study on fresh water. To understand the biological effects of different strength magnetized fresh water (MFW), seed germination and potted experiments on cotton were carried out to study the effects of MFW with different magnetic intensity (0, 100, 300, 500 mT). Results showed that the surface tension coefficient of MFW reduced by 7.3–10.5%, whilst dissolved oxygen concentrations increased by 8.8–12.7%. Germination strength indexes of cotton cultivated with MFW significantly increased, showing potential and vigor indexes of 16.8–22.4% and 47.4–78.0%, respectively. The emergence rate of cotton irrigated with MFW was faster and higher, with recorded values of 7.7–13.1%. The net photosynthetic rate (Pn) and instantaneous water use efficiency (iWUE) of cotton increased significantly, whereas the stomatal limit value (Ls) decreased. In all, results suggest the total biomasses of MFW irrigated cotton have significantly increased. Therefore, it is suggested that MFW may more effectively promote the utilization of water and light in cotton under magnetic field intensities of 300–500 mT. The results can provide guidance for the efficient utilization of magnetized fresh water in arid and semi-arid areas.
Highlights
As a new type of green and pollution-free water treatment technology (Esmaeilnezhad et al ), magnetization is simple, efficient, and low input (Luo et al )
Comparing cotton seeds cultivated with fresh water against those under different magnetized intensities, the results suggested that germination index (GI)’s cotton seeds cultivated by FM3 improved the most, whereas germination potential (GP), germination rate (GR), and GI of cotton seeds treated with FM1 were slightly larger than FM5
The surface tension coefficient of magnetized fresh water (MFW) decreased by 7.3–10.5%, the dissolved oxygen content increased by 8.8–12.7%, and the water molecular activity was significantly improved
Summary
As a new type of green and pollution-free water treatment technology (Esmaeilnezhad et al ), magnetization is simple, efficient, and low input (Luo et al ). Studies on the early growth of crops found that magnetized water irrigation significantly improved germination rate, germination index, activity index, salt tolerance index, and other physiological factors of corn (Zea mays L.) seeds, and promoted the growth of maize seedlings under saline conditions (Aghamir et al ). Sayed ( ) indicated that magnetized water treatment had a significant positive effect on plant growth parameters (i.e. height, leaf area, leaf, stem, root fresh weight, and dry weight) of broad bean (Vicia Faba L.) seedlings. Massah et al ( ) indicated that the intensity of the magnetic field and the type of treated water had a significant effect on the germination and growth characteristics of wheat seeds. The germination rate of seeds treated with 400 mT of distilled water was the highest (53.3%), the fresh weight of seedlings treated with 600 mT of distilled water was the highest, and the root length of wheat seeds treated with 400 mT of groundwater was the largest (155.3 mm)
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