Evapotranspiration Partition and Dual Crop Coefficients in Apple Orchard with Dwarf Stocks and Dense Planting in Arid Region, Aksu Oasis, Southern Xinjiang

Hui Cao, Hongbo Wang, Yong Li, Abdoul Kader Mounkaila Hamani, Nan Zhang, Xingpeng Wang and Yang Gao
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Hui Cao: College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Hongbo Wang: College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Yong Li: College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Abdoul Kader Mounkaila Hamani: Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Nan Zhang: College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Xingpeng Wang: College of Water Conservancy and Architecture Engineering, Tarim University, Alar 843300, China
Yang Gao: Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China

Agriculture, 2021, vol. 11, issue 11, 1-16

Abstract: Crop coefficients are critical to developing irrigation scheduling and improving agricultural water management in farmland ecosystems. Interest in dwarf cultivation with high density (DCHD) for apple production increases in Aksu oasis, southern Xinjiang. The lack of micro-irrigation scheduling limits apple yield and water productivity of the DCHD-cultivated orchard. A two-year experiment with the DCHD-cultivated apple (Malus × domestica ‘Royal Gala’) orchard was conducted to determine crop coefficients and evapotranspiration (ET a ) with the SIMDualKc model, and to investigate apple yield and water productivity (WP) in response to different irrigation scheduling. The five levels of irrigation rate were designed as W1 of 13.5 mm, W2 of 18.0 mm, W3 of 22.5 mm, W4 of 27.0 mm, and W5 of 31.5 mm. The mean value of basal crop coefficient (K cb ) at the initial-, mid-, and late-season was 1.00, 1.30, and 0.89, respectively. The Kc-local (ET a /ET 0 ) range for apple orchard with DCHD was 1.11–1.20, 1.33–1.43, and 1.09–1.22 at the initial, middle, and late season, respectively. ET a of apple orchard in this study ranged between 415.55–989.71 mm, and soil evaporation accounted for 13.85–29.97% of ET a . Relationships between total irrigation amount and apple yield and WP were developed, and W3 was suggested as an optimum irrigation schedule with an average apple yield of 30,540.8 kg/ha and WP of 4.45 kg/m 3 in 2019–2020. The results have implications in developing irrigation schedules and improving water management for apple production in arid regions.

Keywords: crop coefficients; SIMDualKc; evapotranspiration; dwarf cultivation with high density; Royal Gala; water productivity (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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