Your search found 3 records
1 Shangguan, Z.; Shao, M.; Horton, R.; Lei, T.; Qin, L.; Ma, J. 2002. A model for regional optimal allocation of irrigation water resources under deficit irrigation and its applications. Agricultural Water Management, 52(2):139-154.
Water deficit ; Water allocation ; Crop production ; Mathematical models ; Irrigation efficiency ; Irrigation scheduling / China / Loess Plateau / Yangling
(Location: IWMI-HQ Call no: PER Record No: H030257)
2 Jiantao, D.; Wenqing, H.; Nangia, Vinay; Changrong, Y.; Ahmad, Mobin-ud-Din; Shuang, L.; Qin, L.. 2008. Effects of conservation tillage on soil water content in northern arid regions of China. In Chinese. Transactions of the Chinese Society of Agricultural Engineering, 24(11):25-29.
Conservation tillage ; Soil water ; Water balance ; Models ; Water use efficiency ; Water productivity / China
(Location: IWMI HQ Call no: IWMI 631.451 G592 JIA Record No: H041714)
Soil water content is the key factor that affect the agriculture production in northern arid regions of China. It is helpful to select proper tillage methods and improve water productivity based on the study of soil water content changing. Soil water content, water balance and water use efficiency were simulated and checked used the DSSAT model based on two-year field experiment. The results show that in dry year the soil water content of conservation tillage is higher than the conventional tillage, RMSE is 0.025-0.063. In dry year, and the largest decrease of soil water storage is conventional tillage (144.6 mm), and the same in normal year (46.1 mm). Water use efficiency in dry year is 1.52-1.78 kg/m3, the largest is no tillage with residue cover treatment, in the normal year is 1.70-1.71 kg/m3. The differences between different treatments are not obvious. The results provide theoretical foundation for the research of effects of conservation tillage on soil water in the field.
3 Nangia, Vinay; Ahmad, Mobin-ud-Din; Du, J.; Changrong, Y.; Hoogenboom, G.; Xurong, M.; Wenqing, H.; Shuang, L.; Qin, L.. 2009. Modeling the effects of conservation agriculture on land and water productivity of rainfed maize in the Yellow River Basin, China. In Humphreys, E.; Bayot, R. S. (Eds.). Increasing the productivity and sustainability of rainfed cropping systems of poor smallholder farmers: proceedings of the CGIAR Challenge Program on Water and Food, International Workshop on Rainfed Cropping Systems, Tamale, Ghana, 22-25 September 2008. Colombo, Sri Lanka: CGIAR Challenge Program on Water and Food. pp.147-166.
Tillage ; Simulation models ; Water productivity ; Soil water ; Water balance ; Maize ; Crop yield / China / Yellow River Basin
(Location: IWMI HQ Call no: 631 G000 HUM Record No: H042440)
http://www.dfid.gov.uk/r4d/PDF/Outputs/WaterfoodCP/CPWF_Proceedings_Rainfed_Workshop%5B1%5D.pdf
https://vlibrary.iwmi.org/pdf/H042440.pdf
https://vlibrary.iwmi.org/pdf/H042440.pdf
(0.47 MB) (8.92MB)
In the dryland regions of North China, water is the limiting factor for rainfed crop production. Conservation agriculture (featuring reduced or zero tillage, mulching, crop rotations and cover crops) has been proposed to improve soil and water conservation and enhance yields in these areas. Conservation agriculture systems typically result in increased crop water availability and agro-ecosystem productivity, and reduced soil erosion. To evaluate the potential of conservation agriculture to improve soil water balance and agricultural productivity, the DSSAT crop model was calibrated using the data of a field experiment in Shouyang County in the semi-arid northeastern part of the Yellow River Basin. The average annual precipitation at the site is 472 mm, 75% of which falls during the growing season. The site had a maizefallow-maize rotation. We used data from two crop seasons (2005 and 2006) and four treatments for calibration and analysis. The treatments were: conventional tillage (CT), no-till with straw mulching (NTSM), all-straw incorporated (ASRT) and one-third residue left on the surface with no-till (RRT). The calibration results gave satisfactory agreement between field observed and model predicted values for crop yield for all treatments except RRT, and for soil water content of different layers in the 150cm soil profile for all treatments. The difference between observed and predicted values was in the range of 3-25% for maize yield and RMSE was in the range of 0.03-0.06cm3/cm3 for soil water content measured periodically each cropping season. While these results are encouraging, more rigorous calibration and independent model evaluation are warranted prior to making recommendations based on model simulations. Medium-term simulations (1995-2004) were conducted for three of the treatments using the calibrated model. The NTSM and ASRT treatments had similar or higher yields (by up to 36%), higher crop water productivity by up to 28% and reduced runoff of up to 93% or 43 mm compared to CT.
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