温州ミカンの栄養生理に関する研究 VII. 窒素施用濃度と6年継続砂耕樹の生長および養分吸収

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Title
温州ミカンの栄養生理に関する研究 VII. 窒素施用濃度と6年継続砂耕樹の生長および養分吸収
Title Alternative
Studies on the nutrition of Satsuma mandarin. VII. Growth and mineral absorption of young trees as related to the concentration of nitrogen in sand culture for six years
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Description

Young satsuma mandarin trees on trifoliate orange rootstock were grown in sand culture for six years, with differential nitrogen feeding. Nitrogen in nutrient solutions was adjusted 6 levels from 0 to 160 ppm with ammonium sulfate while phosphoric acid and potassium were maintained in 40 ppm. 1. Twenty to 40 ppm of nitrogen application resulted in higher tree growth and fruit yield as compared with the other treatments. Nitrogen contents of spring leaves showed a yearly decrease. 2. The absorbed amounts of nitrogen of leaf, shoot, trunk, large root and fine root increased in proportion to the concentration in the nutrient solution. The amounts of P, K, Ca and Mg were most influenced by the amounts of tree growth, and those were the highest at the concentration of 20 or 40 ppm. 3. From the results mentioned above, the optimum leaf contents in August were about 3.0% of N, 0.20% of P and 1.7% of K in dry weight basis.

樹勢のそろったカラタチ台杉山系温州ミカン7年生結実樹を窒素施用濃度をかえて6か年継続砂耕し, 樹体の生長と果実収量の年次変化を観察するとともに, 最終年度に掘り上げて, 樹体各部に含まれる肥料成分含有量から窒素の施用が樹体の養分吸収に及ぼす影響を観察した. 1. 窒素施用濃度が20?40ppmの範囲で, 栄養・生殖両生長ともに優れたが, それより高濃度でも低濃度でも樹勢は次第に衰え, 結実は著しく悪くなった. 樹令が進むにしたがい, 毎年8月の葉内N含有率は次第に低下した. 2. 窒素施用濃度の増加に伴い, Nの樹体内の含有量は増すが, P, K, CaおよびMgはいずれも樹体の生長の旺盛であった20?40ppm区で含有量が多かった. 3. 以上の結果から, 樹勢の維持と果実収量の両面から考えて最適の葉内含有率(対乾物)はN3.0%, P 0.20%, K 1.7%であった.

Author
著者 井上 宏
著者(ヨミ) イノウエ ヒロシ
著者(別表記) Inoue Hiroshi
著者 磯辺 淳二
著者(ヨミ) イソベ ジュンジ
著者(別表記) Isobe Junji
Publication Title
香川大学農学部学術報告
Volume
32
Issue
2
Start Page
95
End Page
102
Publisher
香川大学農学部
Published Date
198103
ISSN
0368-5128
NCID
AN00038339
Resource Type
Departmental Bulletin Paper
Language
jpn
Text Version
publisher
Set
香川大学
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