Izvorni znanstveni članak
Analysis of Climate Elements in Central and Western Istria for the Purpose of Determining Irrigation Requirements of Agricultural Crops
Ivan Šimunić
; University of Zagreb, Faculty of Agriculture, Department of Amelioration, Zagreb, Croatia
Tanja Likso
; Meteorological and Hydrological Service, Zagreb, Croatia
Stjepan Husnjak
; University of Zagreb, Faculty of Agriculture, Department of Soil Science, Zagreb, Croatia
Marina Bubalo Kovačić
; University of Zagreb, Faculty of Agriculture, Department of Amelioration, Zagreb, Croatia
Sažetak
A consequence of climate changes is an increasing frequency of drought, which on average
occurs in Croatia every third to fifth year and during the vegetation period it can reduce crop
yield significantly. The aim of the research is both to determine crop water requirements in
an average and in a dry year and to determine the decline in crop yields in an average and in
a dry year. The multi-annual climate data series for a 30-year period, 1981-2010 from station
Pazin in central Istria and 1981-2010 from Poreč in western Istria was used. Based on these
data, a reference evapotranspiration was calculated for an average and a dry year using the
Penman-Monteith method through "Cropwat" software. The crop water requirement for five
different crops is determined by soil water balance using the Palmer method (Palmer, 1965),
corrected according to Širić and Vidaček (1988), using "Hidrokalk" software. Crop response
to the lack of soil water and yield decline were determined according to the method published
by Doorenbos and Kassam (1979). Correlation test was used to determine correlation
between precipitation and crop yields. In central Istria, water shortage in an average year
ranged from 3.4 mm (olives) to 110.7 mm (alfalfa) and yield decline ranged from 1.1%
(olives) to 18.6% (alfalfa), while in a dry year water shortage ranged from 43.2 mm (olives)
to 229.5 mm (alfalfa) and ranged from 10.3% (olives) to 37.7% (alfalfa). In western Istria, in
an average year water shortage ranged from 35.5 mm (olives) to 239.7 mm (alfalfa) and yield
decline ranged from 7% (olives) to 40.2% (tomatoes), and in a dry year water shortage ranged
from 74.4 mm (olives) to 288.9 mm (alfalfa) and yield decline ranged from 14.4% (olives) to
40.7% (alfalfa). The determined water shortage and reduced yields are sufficient indicators of
irrigation requirements in Istria.
Ključne riječi
climate elements, central and western Istria, agricultural crops, irrigation
Hrčak ID:
263052
URI
Datum izdavanja:
30.9.2021.
Posjeta: 706 *