Effect of nitrogen fertilization on the content of mineral components in soil, leaves and fruits of Sampion apple trees
2004
Pacholak, E. | Zachwieja, M., E-mail: [email protected] | Zydlik, Z. (Poznan Agricultural University (Poland). Dept. of Pomology)
Trees of Sampion on M.9 rootstock were planted in the spring 1994 on virus-free rootstock EMLA 9 at spacing of 3.5 x 1 m (2857 trees per ha) on grey-brown sandy loam podsolic soil. Nitrogen fertilization had a significant effect on changes in the assimilable elements in soil. It exerted an effect on the decrease of assimilable potassium in the arable and subarable layer and an increase of assimilable magnesium improving the K:Mg ratio. A smaller effect was found in the changes of assimilable phosphorus content and in soil reaction. Nitrogen fertilization had an effect on the increase of total nitrogen content in leaves and it decreased the content of phosphorus. The content of assimilable components in soil was not correlated with the content of general components in leaves. The content of mineral components in fruits was closely correlated with the component content in leaves. Climatic conditions, and particularly the absence of atmospheric precipitations and the increase of temperature, as well as the aging of trees contributed to the decrease of the content of nitrogen, phosphorus, potassium and magnesium and to the increase of calcium content
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