Absorption, Translocation, and Assimilation of Foliar-Applied Urea Compared with Nitrate and Ammonium in Tomato Plants

スポンサーリンク

概要

• 論文の詳細を見る

• To evaluate the use of foliar application of N fertilizer and the occurrence of leaf injury in tomato plants (Lycopersicon esculentum Mill., cv. Momotaro), the effects of the form and concentration of N and solution pH on the leaf injury were studied in the first experiment (Expt. 1). The effects of solution pH and leaf surface on the absorption, translocation, and assimilation of urea were compared with those of nitrate and ammonium in the second experiment (Expt. 2). In Expt. 1, no leaf injury was observed regardless of N sources applied at the N concentration of 1.0 g L^<-1>. Compared with nitrate or ammonium, the index of leaf injury was the lowest in the leaf to which urea had been applied (hereafter referred to as "urea-applied leaf"), when the N level increased from 2.0 to 10.0 g L^<-1>. Leaf injury was not affected by the solution pH in the case of urea, but it increased in the case of ammonium and decreased when nitrate was applied with increasing solution pH. In Expt. 2, the absorption of nitrate and ammonium by a leaf within 4 d was 34% and 74% of that of urea, respectively. N absorption at the lower leaf surface was much greater than that at the upper leaf surface for each N source. No apparent effect of solution pH on the absorption of urea was detected. With increasing solution pH, however, the absorption of nitrate decreased. The absorption of ammonium was the greatest at solution pH 7.5. Total-^<15>N translocation from applied leaf to other plant parts within 4 d was the largest in the urea-applied plants. Effects of solution pH and leaf surface on ^<15>N distribution were not appreciable. ^<15>N assimilation was the quickest in the urea-applied plants. Two days after application, ^<15>N assimilation in the whole plant was up to 76.9% in the urea-applied plants, but only 33.7% and 43.0% in the nitrate-and ammonium-applied plants, respectively. Urea was an appropriate foliar N source due to the low ability to injure foliage because of the rapid absorption and translocation, fast assimilation, and the wide and suitable range of solution pH. Foliar application of N to the lower leaf surface was recommended.

• 社団法人日本土壌肥料学会の論文

著者

• Tan Xue

  Laboratory Of Vegetable Crops College Of Agriculture Osaka Prefecture University

• Ikeda H

  Laboratory Of Vegetable Crops College Of Agriculture Osaka Prefecture University

• ODA Masayuki

  Laboratory of Plant Propagation, Graduate School of Agriculture and Biological Science, Osaka Prefec

• IKEDA Hideo

  Laboratory of Vegetable Crops, Graduate School of Agriculture and Biological Science, Osaka Prefectu

• Oda Masayuki

  Laboratory Of Vegetable Crops College Of Agriculture Osaka Prefecture University

• Oda Masayuki

  Laboratory Of Plant Propagation Graduate School Of Agriculture And Biological Science Osaka Prefectu

• Ikeda Hideo

  Laboratory Of Vegetable Crops College Of Agriculture Osaka Prefecture University

• Ikeda Hideo

  Laboratory of Science Education, Faculty of Education, Hiroshima University

• IKEDA Hideo

  Laboratory of Plant Chromosome and Gene Stock of the Faculty of Science, Hiroshima University

関連論文

• Causes of Low Survival in Cucumber (Cucumis sativus L.) Plants Grafted onto Pumpkin (Cucurbita moschata Duch.) Rootstocks by Horizontal-Cut Grafting at the Center of the Hypocotyl
• Absorption, Translocation, and Assimilation of Foliar-Applied Urea Compared with Nitrate and Ammonium in Tomato Plants
• Isolation and Preservation of the Living Embryo Sac of Crinum asiaticum L. var. japonicum Baker
• Grafting of Vegetable Crops
• Maintenance and mass-propagation of aneuploid in annual haplopappus gracilis (2n=4) by shoot tip cloning.

スポンサーリンク