Effects of Fertilizer Application Scheme and Planting Distance on Cavitation and Pithiness of ‘Sakurajima Daikon’ (<i>Raphanus sativus</i> L.)

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  • ‘桜島大根’ における施肥方法・株間の違いが空洞症・す入りに及ぼす影響
  • 'サクラジマ ダイコン'ニ オケル セヒ ホウホウ ・ カブマ ノ チガイ ガ クウドウショウ ・ スイリ ニ オヨボス エイキョウ

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<p>We investigated the effects of the fertilization scheme and planting distance on the incidence of cavitation and the pithiness of thickening roots of ‘Sakurajima daikon’ (Raphanus sativus L.). Two cultivars: the open-pollinated ‘Native cultivar (Sakurajima)’ used in the Sakurajima region and the F1 cultivar ‘Kagoshima No5’, were used in this study. The prevalence of cavitation was increased in both cultivars when preplanting fertilizer was mainly applied to them with a reduced amount of additional fertilizer, compared with the scheme in which preplanting fertilizer was decreased and additional fertilizer was increased. Cavitation was also increased with sparse planting compared with dense planting. A positive correlation was noted between the occurrence rate of cavitation and the nitrogen levels in soil at the time of thinning excess seedlings, suggesting that a high dose of nitrogen in an early growth stage could cause the cavitation of ‘Sakurajima daikon’. As for the pithiness of thickening roots, this symptom was more frequently observed when additional fertilizer was increased, compared with the scheme in which additional fertilizer decreased and preplanting fertilizer increased. However, the problem regarding pithiness may be avoided if the F1 cultivar ‘Kagoshima No. 5’ is chosen instead of the ‘Native cultivar (Sakurajima)’ for cultivation, because the progression of pithiness in the former is much slower than in the latter.</p>

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