|Author:||Maffei, J. A. ; Nijensohn, L. ; Rodríguez-Plaza, L.|
|Book Group Author:||NA|
An attempt has been made to relate the amount of water applied by trickle irrigation to the salinity of the soil with a view to determining how much water may be applied before leaching is required. The following approach was developed: (1) For each specific water and soil combination a functional leaching requirement (FLR) is defined as the inverse of the number of times (1/n) that a certain irrigation quota (IQ) may be applied consecutively until leaching is required to control total soil salinity or any of its components; (2) The value of "n" is found experimentally by analysing the saturation extract of a soil, whose initial conditions are known, by evaporating in a microwave oven after increasing number of IQs of a certain irrigation water have been applied. This approach was tried regionally in 40 combinations of 5 soils and 8 waters and their FLR were compared with a theoretical expected LR calculated as the simple consequence of concentration, without any provision for changes in chemical composition during the process. The results showed that in some water-soil combinations the FLR may differ significantly from the theoretical LR for total salinity and soluble boron content. The influence on "n" on the relation between the IQ and the percentage of water saturation (%Ws) and of the relation between %Ws and field capacity on the interpretation criteria are discussed.
|Pages:||147 - 153|
boron, irrigation water, leaching, saturation, soilsalinity, trickle irrigation, Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management],Soil Chemistry and Mineralogy (JJ200)