title: Irrigation water productivity is more influenced by agronomic practice factors than by climatic factors in Hexi Corridor, Northwest China.
abstract: Quantifying the influence of driving factors on irrigation water productivity (IWP) is vital for efficient agricultural water use. This study analyzed contributions of agronomic practice and climatic factors to the changes of IWP, based on the data from 1981 to 2012 in Hexi Corridor, Northwest China. Cobb-Douglas production functions were developed by the partial least squares method and contribution rates of the driving factors were calculated. Results showed that IWP and its driving factors increased during the study period, with different changing patterns. IWP was significantly correlated with the agronomic practice factors, daily mean temperature and solar radiation of the crop growing period. The agronomic practice factors including irrigation, fertilization, agricultural film, and agricultural pesticide contributed 20.6%, 32.8%, 42.3% and 11.1% respectively to the increase of IWP; and the contribution rates of the climatic factors, i.e. daily mean temperature and solar radiation, are -0.9% and 0.9%. And the contributions of these factors changed in different sub-periods. It is concluded that agronomic practice factors influenced IWP much more than climatic factors. The improvement of IWP should rely on advanced water-saving technology and application of optimum (need-based) fertilizer, agricultural film and pesticide, ensuring efficient use of agronomic inputs in the study area.
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Li
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Xiaotao
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Niu
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Tong
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Shaozhong
authors.initials: S
authors.lastname: Kang
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Taisheng
authors.initials: T
authors.lastname: Du
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Sien
authors.initials: S
authors.lastname: Li
authors.affiliation: Center for Agricultural Water Research in China, China Agricultural University, Beijing, 100083, China.
authors.forename: Risheng
authors.initials: R
authors.lastname: Ding