Your search found 4 records
1 Clothier, B. E.; Green, S. R.. 1994. Rootzone processes and the efficient use of irrigation water: Review article. Agricultural Water Management, 25(1):1-12.
Sprinkler irrigation ; Flood irrigation ; Irrigation water ; Water use efficiency ; Infiltration ; Irrigation effects
(Location: IWMI-HQ Call no: PER Record No: H014062)
The need for more-efficient agricultural use of irrigation water arises out of increased competition for water resources, and the greater pressure on irrigation practices to be environmentally friendly. In this review for the 25th Jubilee volume of Agricultural Water Management we focus on three rootzone processes that determine water-use efficiency in irrigation. Firstly, we discuss the role of macropores in preferentially-transporting irrigation water to depth during infiltration under both sprinkler and flood systems. It is suggested that more-uniform entry of irrigation water into the rootzone will result either by matching the sprinkler rate to the soil's matrix hydraulic conductivity, or by modifying the soil-surface's macroporosity prior to flood irrigation. Secondly, the environmentally- deleterious leaching of chemicals by irrigation is shown to be reduced if the applied fertilizer is first washed into dry soil by a small amount of water. This first pulse of water is drawn by capillarity into the soil's microporosity, and it carries with it the dissolved fertilizer which becomes resident there. These nutrients are then available for plant uptake, yet less prone to subsequent leaching by heavy rains. Meanwhile, initially- resident solutes in the dry soil, such as salts, will be more-effectively displaced by the infiltrating irrigation water. Finally, our time domain reflectometry (TDR) observations of the changing soil water content in the rootzone of a kiwifruit vine, and our direct measurements of sap flow within individual roots, both reveal that plants can rapidly change their spatial pattern of water uptake in response to the application of irrigation water. The prime uptake role of near-surface roots is highlighted. Consideration of all three of these rootzone processes reinforces the claim that more- efficient and environmentally-sustainable water management will arise through higher-frequency applications of smaller amounts of irrigation.
2 Green, S. R.; Clothier, B. E.; McLeod, D. J. 1997. The response of sap flow in apple roots to localised irrigation. Agricultural Water Management, 33(1):63-78.
Drip irrigation ; Horticulture ; Experiments ; Water requirements ; Irrigation requirements ; Soil-water-plant relationships / New Zealand
(Location: IWMI-HQ Call no: PER Record No: H020734)
3 Mpelasoka, B. S.; Behboudian, M. H.; Green, S. R.. 2001. Water use, yield and fruit quality of lysimeter-grown apple trees: Responses to deficit irrigation and to crop load. Irrigation Science, 20(3):107-113.
Water use ; Crop production ; Horticulture ; Yields ; Water deficit ; Irrigation scheduling ; Soil water ; Water balance ; Lysimetry ; Soil moisture / New Zealand
(Location: IWMI-HQ Call no: PER Record No: H028701)
4 Fernandez, J. E.; Paloma, M. J.; Diaz-Espejo, A.; Clothier, B. E.; Green, S. R.; Giron, I. F.; Moreno, F. 2001. Heat-pulse measurements of sap flow in olives for automating irrigation: Tests, root flow and diagnostics of water stress. Agricultural Water Management, 51(2):99-123.
(Location: IWMI-HQ Call no: PER Record No: H028892)
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