| Purpose of this facility |
to determine orchard water requirements for irrigation
scheduling and evapotranspiration of apple and pear trees |
| Lysimeter type |
WEIGHABLE BACKFILLED GRAVITATION LYSIMETER |
| Operating since |
1999? |
| Number of lysimeters |
2 |
| Size classification |
large |
| Exact size |
9.5 mē x 1.7 m depth |
| Lysimeter cellar (material) |
Concrete |
| Weighing equipment |
4 load cells (capacity: 15 t each) |
| Seepage water determination |
Gravimetric |
| Vegetation and cultivation |
Orchard: apple and pear trees |
| Data logger |
yes |
| Other details (data formats etc.) |
Load cells are connected to a logger |
| Further investigations/equipment |
Irrigation recipients (100 l each): daily refilled at
night with a similar amount of water lost the day before,
water is again used to irrigate the lysimeter; automated
weather station |
| Remarks |
Each lysimeter is located in the center of a plot (apples
and pears). Sensitivity of load cells is 0.5 kg which
allows us to detect water consumption of 0.053 mm. |
| Amount of irrigation in mm/year |
depending on evapotranspiration |
| Meteorological parameters |
Temperature, precipitation, relative humidity, global
radiation |
| Evaporation determination (formula) |
PENMAN-MONTEITH (Eto) |
Water balance determination
(formula) |
crop coefficients values (Kc) determined as: Kc = ETc/Eto;
Etc obtained directly from lysimeters |
| Other analyses or formulas used |
Light interception determined weekly (ceptometer) |
| Year of survey |
2004 |
