The Process of Production of Dry Matter and Nutrient Absorption of Peach Trees in Ten Years

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  • モモ樹の乾物重と養分吸収量の10年間の増加過程
  • モモ樹の乾物量と養分吸収量の10年間の増加過程
  • モモ ジュ ノ カンブツリョウ ト ヨ

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Abstract

To clarify the process of growth and nutrient absorption from nursury stock to mature peach tree, the trees cultivated under the same conditions were lifted and separated into constituent parts every year during the first 5 years and every other year thereafter, and then were weighed and analyzed. The results obtained were as follows:<br>1. The amount of annual dry matter production increased every year for the first 7 years, and then reached a constant value by the reason that the increment of tree parts decreased thereafter while fruit yield further increased. Fruit yield and dry matter weight of fallen leaves increased for the first 9 years in proportion to expansion of the tree crown, and then reached a constant in 11 years of age.<br>2. Young branches and fine roots had higher contents of nutrient than older branches and roots regardless of age of trees, but nutrient contents in all parts of tree varied significanthy from one year to another.<br>3. The yearly variation in the amount of annual nutrient absorption and the amount of stored nutrient after the growing season showed a different pattern for each nutrient element.<br>4. The amounts of nutrient elements absorbed by the 11 year-old tree were 104kg of N, 25kg of P2O5, 131kg of K2O, 109kg of CaO, and 23kg of MgO under the condition that the trees were planted at a rate of 212 trees per ha and produced 28t fruit per ha. The amounts of N, P2O5 and CaO absorbed reached a constant after 9 years of cultivation, but the amount of K2O increased until 11 years of age because of increasing fruit production.

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