Folia Horticulturae

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Effect of nitrogen fertilization on growth, cropping and fruit quality of ‘©ampion’ apple trees during 9 years after planting

Dariusz Wrona

Department of Pomology and Basic Natural Sciences in Horticulture
Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland
e-mail: wrona@alpha.sggw.waw.pl

The experiment was established in autumn 1993 at Warsaw-Wilanów, Central Poland, on alluvial loamy soil. ‘©ampion’ on M.9 one-year-old unfeathered trees were spaced at 3×1 m. Herbicide strips (1 m wide) were maintained along tree rows and sward in alleyways. Beginning in 1994, five N fertilizer treatments were applied: (1) N - 0, check, without nitrogen; (2) N - 50, 50 kg N ha-1, applied in early spring on the whole soil surface; (3) N - 100, 100 kg N ha-1, in early spring on the whole surface; (4) N - 50 + 50, 50 kg ha-1 in early spring + 50 kg N ha-1 5 weeks later, on the whole surface; (5) N - 50herb., 50 kg N ha-1 on the herbicides strips only, in early spring. Neither dose N or mode of N fertilization had any effect on the tree growth. Nitrogen fertilization had no effect on the cumulative yield of apple trees for the years 1995-2002. Cropping efficiency coefficient for 8 years of bearing (1995-2002), calculated in relation to the trunk cross-sectional area in autumn 2002, did not depend on N fertilization either. In 2002 fruit firmness and the content of soluble solids before and after storage was not affected by N fertilization. The percentage of fruits with blush over 75% of skin surface was affected by N fertilization. The higher dose, i.e. 100 kg N ha-1, reduced the number of fruits with blush >75% of surface.

Wrona D., 2004. Effect of nitrogen fertilization on growth, cropping and fruit quality of ‘©ampion’ apple trees during 9 years after planting. Folia Horticulturae 16/1: 55-60.