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N-Nutrition of apple - part 2: nutrient status and fertilizing methods



N-Nutrition of apple - part 2: nutrient status and fertilizing methods



Erwerbsobstbau 43(1): 7-14



Soil, leaf and fruit analyses are used for the calculation of the nutrient status in apple orchards. An Nmin-value of 70 to 80 kg NO3-N/ha should be reached in the soil. Leaf N-contents between 2.2 and 2.6% of dry matter are optimal. In fruit analysis, higher N-levels lead to reduced storability of apples. Values of between 30 and 60 mg N/100 g fresh weight should be reached. Nitrogen fertilization must consider N-mineralization in the soil and the N-uptake of trees during the season.

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Accession: 003506198

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