|Author:||Germanà, C. ; Sardo, V.|
|Book Group Author:||NA|
During two successive years [year not given], 7 different crop coefficients (Kc) were applied in the management of a drip system to irrigate a mature orange (cv. Tarocco) grove in Sicily, Italy. The volumes of water application were determined multiplying the evaporation from a class A evaporimeter by constant Kc values ranging from 0.4 to 0.7, and including values varying in time from 0.4 to 1.2, plus a treatment where Kc was changed according to pre-dawn xylem potential (the physiological treatment). The total seasonal volumes of applied water, averaged over the two years, ranged from a minimum of 2022 m3/ha (with a constant Kc of 0.4) to a maximum of 3548 m3/ha (with a constant Kc of 0.7). The best water use efficiency (the ratio of yield to applied water) was achieved in two treatments: the constant Kc 0.4 and the physiological treatment. The unit fruit weight was negatively correlated to the number of fruit, which however positively impacted the total production. These results give a support in finding a trade-off in citrus irrigation management between yield quantity, fruit size and water volume to maximize profit and save resources, and suggest that physiological indicators are a better guide to irrigation scheduling than the standard ETo × Kc procedure.
|Pages:||269 - 275|
crop yield, fruits, oranges, plant water relations, trickleirrigation, water use efficiency, xylem water potential, Italy, Sicily,Citrus, Citrus sinensis, Rutaceae, Sapindales, dicotyledons,angiosperms, Spermatophyta, plants, eukaryotes, Citrus, Southern Europe,Europe, Mediterranean Region, Developed Countries, European UnionCountries, OECD Countries, Italy, Rutales, Sicilia, Horticultural Crops(FF003) (New March 2000), Plant Water Relations (FF062), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]