Effect of Soil Amendments and Nitrogen Fertilizer Application on Tree and Fine Root Growth and Fruit Quality of Medium-late Maturing Cultivar Citrus 'Shiranuhi'

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  • 中晩生カンキツ‘不知火’の樹体生育と果実品質ならびに細根量に及ぼす土壌改良資材と窒素施肥量の影響
  • チュウ バンセイ カンキツ シラヌイ ノ ジュタイ セイイク ト カジツ ヒンシツ ナラビニ サイコンリョウ ニ オヨボス ドジョウ カイリョウ シザイ ト チッソ セヒリョウ ノ エイキョウ

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Abstract

Effects of applying soil amendments and the rate of nitrogen fertilizer application on tree and fine root growth and fruit quality were surveyed in ‘Shiranuhi’ 〔‘Kiyomi’ (Citrus unshiu Marc. × C. sinensis Osb.) × C. reticulata Bla.〕, which shows weak vigor. Soil amendments (bark manure, peat-moss, perlite) were applied to improve the physical condition of the soil and to increase the number of fine roots. Excess supply of nitrogen suppressed fine root development, and enhanced the peel ratio and concentration of soluble solid (Brix) in fruits. The effect of an excess supply of nitrogen was about twice as strong as those obtained from the application of soil amendments. Applications of soil amendments and the conventional amount of fertilizer were necessary to improve tree vigor and the number of fine roots.<br>

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