Mulched Drip Irrigation Increases Water Productivity of Cotton by Regulating Root Morpho-Physiological and Leaf Physiological Characteristics in Arid Area

15 Pages Posted: 4 Apr 2023

See all articles by Jiangtao Wang

Jiangtao Wang

affiliation not provided to SSRN

Gangfeng Du

affiliation not provided to SSRN

Jingshan Tian

affiliation not provided to SSRN

Chuangdao Jiang

affiliation not provided to SSRN

Yali Zhang

affiliation not provided to SSRN

Wangfeng Zhang

affiliation not provided to SSRN

Abstract

To explore how mulched drip irrigation (MDI) improved water productivity of cotton by regulating root morpho-physiological and leaf physiological characteristics. This study analyzed the effects of MDI (conventional drip irrigation; excessive drip irrigation) and traditional flood irrigation (TFI) (reduced flood irrigation; conventional flood irrigation) on the morphology of white fibrous root, fine roots and leaf physiology, organs biomass-level and yield-level water use efficiency by combining minirhizotron technique with monolith method. The results indicated that compared to the TFI, conventional drip irrigation (DI-3) (390 mm) promoted the growth of white fibrous root in the 0-60 cm soil layer, and reduced the MDA content of fine roots at the full flowering stage (FF) and prophase full boll stage (PFB). The improvement of root physiological functions under DI-3 increased the leaf relative water content, and reduced the leaf MDA content, thus improved the leaf physiological functions, and increased the net increase in total biomass of cotton plants from FF to PFB by 19.64%~28.24%. Moreover, compared to the TFI, the water consumption of DI-3 from FF to PFB decreased by 20.76%~39.07%, which significantly increased the total biomass-level water use efficiency (WUETB) at PFB. Grey correlation analysis showed that the WUETB at PFB determined the final yield-level water use efficiency (WUEY). Therefore, the higher WUETB increased the WUEY of DI-3 by 45.58%~76.59%. However, compared to the DI-3, excessive drip irrigation (DI-6) (600 mm) significantly increased water consumption, leading to a decrease in WUETB at PFB, thus significantly reducing WUEY. In conclusion, mulched drip irrigation improves the morpho-physiological functions of roots by promoting the growth of white fibrous root, thus improves the leaf physiology and increases the yield-level water use efficiency.

Keywords: Irrigation methods, Cotton, Root morpho-physiological, Fibrous root growth, leaf physiology, Water production

Suggested Citation

Wang, Jiangtao and Du, Gangfeng and Tian, Jingshan and Jiang, Chuangdao and Zhang, Yali and Zhang, Wangfeng, Mulched Drip Irrigation Increases Water Productivity of Cotton by Regulating Root Morpho-Physiological and Leaf Physiological Characteristics in Arid Area. Available at SSRN: https://ssrn.com/abstract=4409536 or http://dx.doi.org/10.2139/ssrn.4409536

Jiangtao Wang

affiliation not provided to SSRN ( email )

No Address Available

Gangfeng Du

affiliation not provided to SSRN ( email )

No Address Available

Jingshan Tian

affiliation not provided to SSRN ( email )

No Address Available

Chuangdao Jiang

affiliation not provided to SSRN ( email )

No Address Available

Yali Zhang

affiliation not provided to SSRN ( email )

No Address Available

Wangfeng Zhang (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

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