ISHS Acta Horticulturae 664: IV International Symposium on Irrigation of Horticultural Crops
PEAR CROP COEFFICIENTS OBTAINED IN A LARGE WEIGHING LYSIMETER |
| Authors: | J. Girona, J. Marsal, M. Mata, J. del Campo |
| Keywords: | Evapotranspiration, light interception, palmette, canopy cover, ETc, ETo |
| Abstract:
Hourly pear water consumption (ETc) was determined with a large weighing lysimeter during 2002. The lysimeter was located in the middle of a 4000 m2 pear plot and it contained 3 adult pear trees (cv. ‘Conference’), spaced at 4 m x 1.6 m. The Lysimeter container had a cross sectional area of 9.5 m2 and a depth of 1.65 m (minimum). Weight was determined by means of 4 load cells with an individual capacity of 15 t, which gave to the lysimeter a total weight capacity of 60 t. The weighing sensitivity was 0.5 kg what produced a lysimeter sensitivity of 0.053 mm. ETo was determined from an automatic weather station adjacent to the lysimeter, and pear crop coefficients were determined as a ETc/ETo ratio. Tree intercepted radiation (LI) was weekly determined at solar noon by using a Ceptometer and correlated to the determined Kc. LI and Kc resulted strongly correlated, indicating the potential capacity of LI to be used for estimating Kc values in pear orchards. | |
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