CROP WATER REQUIREMENTS / BY J DOORENBOS AND W.O. PRUITT

Part 1-Calculation of crop water requirements. 1. Calculation of references crop evapotranspiration. 1.1 Blaney- Criddle methods. 1.2 Radiation methods. 1.3 Penman methods. 1.4 Pan evapotranspiration methods. 2. Selection of crop coefficient. 3. Factors affecting crop evapotranspiration. 3.1 Climate: variation with time distance size of irrigation development addiction, altitude. 3.2 Soil water: level of available soil water, ground water, salinity, and surface irrigation. 3.4 Cultural practices: fertilizers, plant population, tillage, mulching, windbreaks, anti-transpiration. Part2: Application of crop water requirement data in identification, design and operation of irrigation projects. 1 Projects identification and preliminary planning. 1.1 Introduction. 1.2 Seasonal and peak projects supply requirements. 1.2.1 Crop water requirements. 1.2.2 Net irrigation requirements: effective rainfall, ground water contribution, stored soil water. 1.2.3 Irrigation requirements: leaching requirement irrigation efficiency. 1.2.4 Summaries of calculation of seasonal and peak projects supply requirements. 2. Projects design. 2.1 Introduction. 2.2. Field and project supply schedules. 2.2.1 Field irrigation schedules: depth of irrigation application interval calculation of field irrigation schedules. 2.2.2 Field irrigation supply schedules: surface sprinkler drip. 2.2.3 Design and operation of supply systems: continuos, rotational, supply on demand. 2.2.4 Summary calculation of projects design and operation. 3. Projects operation 3.1 Refinement of filed supply schedules: adaptive research data collection projects monitoring. 3.2 Application of field irrigation data.

ENG