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| Estimation of soil moisture content of jujube orchard in loess plateau based on water stress coefficient from FAO-56 |
| HU Yong-Xiang, LI Yuan-Nong, ZHANG Ying, JIANG Geng-Min |
| (1. College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China; 2. School of Foreign Language, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China) |
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Abstract To quickly monitor the soil moisture content of dripirrigated jujubes in Loess Plateau, a new equation for estimating average soil moisture content in root zone has been deduced based on the fundamental concept of FAO-56 water stress coefficient and related formulas, the equation is applicable in different growth stages of jujube. In April-September 2009, the equation was used to estimate the soil moisture content in two important growth stages of jujube by allocating three different lowest limits of soil moisture content in Mizhi Experimental Station in loess Plateau, and the dynamic change in moisture content was simulated; additionally, the estimated and measured values were compared and the corresponding error analysis was conducted. The results indicated that the FAO-56 water stress coefficient formula has a high accuracy in the dynamic simulation of the soil moisture content, thus the error between the estimated and measured values is less. During flowering and fruit set stages the correlation coefficients are 0.828 0，0.907 3，0.935 1, the rootmeansquare errors are 0.055, 0.093, 0068 in different treatments (lowest limit of irrigation: 60%, 50%, 40% of field capacity). During fruit development stage the correlation coefficients are 0.777 2, 0.766 7, 0.905 5, and the rootmeansquare errors are 0.057, 0.092, 0.079 for those treatments. Moreover, the correlation coefficients are reduced with increasing soil moisture content, but rise with increasing water stress degree, suggesting for higher soil moisture contents the formula accuracy will get poor slightly. This formula is more suitable for the semiarid areas in Loess Plateau, and it may be useful for agricultural water management.
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Received: 21 September 2012
Published: 31 March 2013
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