Seasonal basal crop coefficient pattern of young non-bearing olive trees grown in drainage lysimeters in a temperate sub-humid climate

摘要

Young non-bearing olive trees were grown in drainage lysimeters and their water consumption was measured over two consecutive yearly-experimental periods to analyze the effect ofseasonal variations on the basal crop coefficient (K-cb). Micro-lysimeter measurements were used to quantify soil evaporation (E-s) and E-s was subtracted from evapotranspiration (ETc) to determine transpiration. Monthly mean (K-cb) were determined as (ETc-E-s)/ETo, where ETo is the FAO-PM grass-reference evapotranspiration, calculated from locally measured weather data. The observed K-cb value at mid-season, 0.38, was obtained in the fall months, with 41% of canopy cover. The mid-season K-cb when adjusted to the FAO-56 standard climate was 0.43. Seasonal patterns of K-cb are presented and the K-cb value during the mid-season growth-stage was found to be similar to those described in the literature for Mediterranean climates. Variation of the basal crop coefficient was satisfactorily explained by measured canopy light interception (FIR) and a linear regression model is presented for K-cb as a function of FIR.