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crop water requirements of major crops indryland of northern China

Journal of Geographical Sciences 1999年第4期9卷 346-354页

作者： ZHONG Zhao-zhan, ZHAO Ju-bao, JU Hui, YU Xiao-chuan(Agrometeorology Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

The concept of crop water requirements is discussed, based on which the calculation modelof crop water requirements is established. In light with crop, soil and meteorological data. the cropwater requirements of major crops in sub-humid and send-arid dryland farming areas of northernChina. including wheat maize , cotton. millet, soybean, sweet potato and potato, are calculated, andthe patterns of crop water requirements of these crops are revealed and discussed in this paper.

关键词： Northem China dryland crops crop water requirements pattern of crop waterrequirements

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FORECAST RESEARCH OF crop water requirements BASED ON FUZZY RULES

FORECAST RESEARCH OF CROP WATER REQUIREMENTS BASED ON FUZZY ...

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第一届国际计算机与计算技术在农业中的应用研讨会

作者： Jianbing Zhang Yeping Zhu Feixiang Chen Department of Computer Science and Technology China University of Petroleum-Beijing Institute of Agricultural Information Chinese Academy of Agricultural Sciences College of Information Beijing Forestry University

This paper put forward the idea of producing fuzzy rules by genetic algorithms based on Takagi-Surgeon Fuzzy Logic System from the dataset of multidimension climate data and crop water requirements,and establishing the fuzzy model to predict crop water *** forecast model was tested and the result showed that it was an effective way to forecast crop water requirements by fuzzy rules model.

关键词： Fuzzy logic system Genetic algorithms crop water requirements

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California Simulation of Evapotranspiration of Applied water and Agricultural Energy Use in California

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Journal of Integrative Agriculture 2013年第8期12卷 1371-1388页

作者： Morteza N Orang Richard L Snyder Shu Geng Quinn J Hart Sara Sarreshteh Matthias Falk Dylan Beaudette Scott Hayes Simon Eching California Department of water Resources Department of Land Air and Water ResourcesUniversity of California School of Environment and Energy Shenzhen Graduate SchoolPeking University

The California Simulation of Evapotranspiration of Applied water （CaI-SIMETAW） model is a new tool developed by the California Department of water Resources and the University of California, Davis to perform daily soil water balance and determine crop evapotranspiration （ETo）, evapotranspiration of applied water （ETaw）, and applied water （AW） for use in California water resources planning. ETaw is a seasonal estimate of the water needed to irrigate a crop assuming 100% irrigation efficiency. The model accounts for soils, crop coefficients, rooting depths, seepage, etc. that influence crop water balance. It provides spatial soil and climate information and it uses historical crop and land-use category information to provide seasonal water balance estimates by combinations of detailed analysis unit and county （DAU/County） over Califomia. The result is a large data base of ETc and ETaw that will be used to update information in the new California water Plan （CWP）. The application uses the daily climate data, i.e., maximum （Tx） and minimum （Tn） temperature and precipitation （Pcp）, which were derived from monthly USDA-NRCS PRISM data （PRISM Group 2011） and daily US National Climate Data Center （NCDC） climate station data to cover California on a 4 kmx4 km change grid spacing. The application uses daily weather data to determine reference evapotranspiration （ETo）, using the Hargreaves-Samani （HS） equation （Hargreaves and Samani 1982, 1985）. Because the HS equation is based on temperature only, ETo from the HS equation were compared with CIMIS ETo at the same locations using available CIMIS data to determine correction factors to estimate CIMIS ETo from the HS ETo to account for spatial climate differences. CaI-SIMETAW also employs near real-time reference evapotranspiration （ETo） information from Spatial CIMIS, which is a model that combines weather station data and remote sensing to provide a grid of ETo information. A second database containing the available soil water

关键词： soil water balance crop water requirements weather generator water resource planning crop coefficient energy use

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Calculation and Simulation of Evapotranspiration of Applied water

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Journal of Integrative Agriculture 2012年第3期11卷 489-501页

作者： Richard L Snyder Shu Geng Morteza Orang Sara Sarreshteh Department of Land Air and Water Resources University of California Davis CA 95616 USA School of Environment and Energy Shenzhen Graduate School Peking University Shenzhen 518055 P.R.China Department of Plant Sciences University of California Davis CA 95616 USA California Department of water Resources Division of Statewide Integrated Water Management Water Use and Efficiency SacramentoCA 94236 USA

The University of California, Davis and the California Department of water Resources have developed a weather generator application program “SIMETAW” to simulate weather data from climatic records and to estimate reference evapotranspiration （ETo） and crop evapotranspiration （ETc） with the generated simulation data or with observed data. A database of default soil depth and water holding characteristics, effective crop rooting depths, and crop coefficient （Kc） values to convert ETo to ETc are input into the program. After calculating daily ETc, the input and derived data are used to determine effective rainfall and to generate hypothetical irrigation schedules to estimate the seasonal and annual evapotranspiration of applied water （ETaw）, where ETaw is the net amount of irrigation water needed to produce a crop. in this paper, we will discuss the simulation model and how it determines ETaw for use in water resources planning.

关键词： weather generator water balance crop water requirements water resource planning crop coefficient

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