Crop water productivity
Crop water productivity (WP) or water use efficiency (WUE) expressed in kg/m³ is an efficiency term, expressing the amount of marketable product (e.g. kilograms of grain) in relation to the amount of input…
Center Pivot Irrigation
Early center pivot irrigation systems showed a lot of potential, but they also broke down. The broke down too often, even according to Robert Daugherty (right) the principal owner of Valley…
Bulk Density – Measurement
Key points Bulk density is the weight of soil in a given volume.Soils with a bulk density higher than 1.6 g/cm3 tend to restrict root growth.Bulk density increases with compaction…
Irrigation Scheduling
Irrigation Scheduling Concept Irrigation scheduling is essential for good water management and it deals with two classical questions related to irrigation. These are (1) how much to irrigate and (2)…
Crop Water Requirement
Crop Water Requirement It is defined as the total quantity of water required by a crop irrespective of its source in a given period of time for its normal growth…
Evapotranspiration
Evaporation and Transpiration Evapotranspiration is one of the major components of the hydrologic cycle and affects crop water demand. Therefore, its quantification is necessary for proper irrigation planning. The term…
Soil Water Constants
Soil Moisture Constants In the previous lecture (21) we have discussed the types of soil water and also measures of water content in the soil. From previous discussion, it is…
Soil Water Movement
Types of Water Movement Movement of water within the soil is a highly complex phenomenon dueto the variation in the states and directions inwhich water moves and the variation in…
Infiltration
Infiltration Process The process of entry of water into the soil is called infiltration, and the time rate at which water percolates into the soil is known as infiltration rate.…
Soil Water
Introduction Soil-water-plant relationship relates to the properties of soil and plant that affect the movement, retention and use of water. Due to inadequate and/or uneven distribution of rainfall during the…
