加温時期の異なるブドウ‘マスカット・オブ・アレキサンドリア’樹における｀１５´Ｎの吸収と移行に及ぼす地温ならびに｀１５´Ｎ施与時期の影響

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  • Effects of Root Temperature and Time of Application of 15N on Its Absorption and Translocation in 'Muscat of Alexandria' Vines Grown under Forced Conditions.
  • カオン ジキ ノ コトナル ブドウ マスカット オブ アレキサンドリア キ ニ

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Two experiments were designed to examine the effects of root temperature under forced conditions on the utilization of nitrogen and on vine growth of potted 'Muscat of Alexandria' vines grafted on 'Hybrid Franc' rootstock. In Experiment 1, a set of vines was administered K15NO3 from mid-October until December when forcing was begun (application before forcing). Another set of vines was fertilized with 15N from December when the forcing was begun and continued until the berries began to set (application after forcing). In Experiment 2, a set of vines was administered K15NO3 from mid-October until February when the vines were forced (application before forcing), whereas another set was fed 15N from February, the beginning of forcing, until the berries began to set (application after forcing). In both Exps. 1 and 2, each set of vines was subdivided into two subgroups in which the root temperature of one sub group was kept at 13°C and the other at 27°C. 15N content and vine growth were monitored periodically.<BR>In Exp. 1, budbreak began earlier and shoot growth and cluster development were more vigorous in vines whose roots were exposed to 27°C than those in which roots were kept at 13°C. In Exp. 2, no differences in the time of budbreak and the rates of vegetative and reproductive growth of vines were observed at both root temperatures. In vines given 15N after forcing in both Exps. 1 and 2, 15N content in the canes and small roots increased greatly at 27°C toward budbreak and berry setting stages, especially in Exp. 1. However, in vines administered 15N before forcing, little difference was found between the two root temperature treatments. Contrarily, in vines given 15N after forcing, total 15N content of vines at the setting stage was markedly greater at 27°C than it was at 13°C in both experiments; and the percent 15N recovered from young shoots of 15N-treated plants was also higher at 27°C than at 13°C. Distribution ratio of 15N in shoots at the setting stage was higher in vines given 15N after forcing than in those administered 15N before forcing except in the 13°C plot in Exp. 2.<BR>We conclude from these findings that level of nitrogen absorbed after the beginning of forcing and its translocation to the upper parts are closely related to shoot growth and cluster development of vines forced from December.

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  • 園芸学会雑誌

    園芸学会雑誌 61 (2), 257-264, 1992

    一般社団法人　園芸学会

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