Influence of moisture conditions on the production and growth of black currant

Black currants are among the most economically important small fruit crops in Latvia. To obtain high berry yields, it is necessary to secure optimal growth conditions for this crop. One of the demands is sufficient moisture supply. In a trial established in spring 1997 with 2 currant varieties 'Titania' and 'Zagadka', three growing methods were tested: 1) without additional moisture regulation (controll variant); 2) sawdust mulch; 3) drip irrigation combined with mineral nutrient supply in water (fertigation). In a situation of prolonged drought, fertigation proved to be the best moisture supply method, providing the plants with optimal amounts of water and nutrients. It was found in the trial that during a long dry period sawdust mulch has negative influence on black currant growth and yield.