engleski

Wather defficit and its influence on corn yield in east Croatia

Regime of water and moisture of loessive, semigley and hydromeliorated soil during two years on the Vinkovci area (eastern Croatia)was investigated. Instantaneous soil moisture content was measured per decades during vegetation in the layer of 0-30 and 30-60 cm in a demolished sample condition and via metal cylinders after Kopecky. When we compared them (calibrating) satisfied coincidence was achieved in a field and subfield layer expressed by high correlation coefficients (R=0.947**, R=0.862** in the first and R=0.933**, R=0.986** in the second researching year) which confirms justification of soil sampling in demolished soil sample condition by means of earth auger. Instantaneous soil moisture content was compared in relation to corn yield. The highest deficiencies were recorded in July and August when the corn is in the pretasseling/tasseling phase as well as in maize grain formation phase. These water deficiencies had the highest reflection on grain yield reduction which was in drier year at water deficiency during vegetation of 143 mm (June and July 131.5 mm) on the average of 5.591 t/ha. In the socond researching year total water deficits during vegetation were considerably lower and amounted to 94 mm which is significantely less than deficiencies monitoring for many years' period for this region with significantly higher average corn yield og 7.320 t/ha.

soil moisture regime; hydrologycal limits; evapotranspiration; soil water deficit; corn yield

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