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Irrigation and K fertilization effects on the cropping and fruit quality of ‘Katja’ apple trees on four different rootstocks

Ewa Jadczuk, Anna Pietranek, Romuald Dziuban

Department of Pomology and Basic Natural Sciences in Horticulture
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland

During the period 1994 to 2000 the effect of irrigation, K fertilization, and rootstock on the yield of ‘Katja’ apple trees was studied. Apple quality was investigated from 1996 to 2000. A significant increase in yield (about 20%) was found as an effect of K fertilization. During the seven-year period the best results were obtained after annual doses of 200 kg K2O ha-1. In general, the yield from trees on M.9-EMLA was higher than on other rootstocks. The rootstock effect on the firmness of the fruit of ‘Katja’ apple trees was observed only in the years 1996-1998. The yield was higher as a result of irrigation - on average by 8.8%. Irrigation had no consistent effect on colour index and fruit firmness.

Jadczuk E., Pietranek A., Dziuban R., 2001. Irrigation and K fertilization effects on the cropping and fruit quality of ‘Katja’ apple trees on four different rootstocks. Folia Horticulturae 13/2: 47-60.