温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第3報ミカンの生育,収量ならびに果実品質に及ぼす影響

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We have discussed about the influence on growth, yield and quality of citrus through ten years of annual application of bromacil (5-bromo-3-sec-butyl-6-methyluracil). 1) Bromacil at plots treated with recommended dosages of bromacil (20g and 40g per 100 m^2) showed a significant increase in the trunk girth after two years of applications when compared with control plots (hand cutting, twice a year). At the plots with high dosage (200g per 100m^2), the citrus trees were restraint in the growth of trunk girth. 2) Upon examination of citrus trees treated annually with 200g per 100m^2 of bromacil, the growth appeared to be almost normal but toxicity was first evidenced by yellowing of the veins and chlorosis in leaves. The symptom lasted during the following six months. 3) When compared with control plots, the yield of citrus fruits increased in those plots treated with bromacil. Plots treated at dosage of 20g and 40g per 100m^2 resulted in highest yields, while the 200g per 100m^2 plot yielded a little less but at this rate no significant difference was noted with untreated plot. It appeared that the percent of large fruits among those yield was high at the plot treated with the herbicide at recommended dosage, but at non-treated plot and the plot at high dosage there were large percents of small fruits. 4) Upon comparison of the results of annually-treated bromacil plots with untreated plots, it was agreed that no significant difference in the following characteristics were noted:- external appearance, surface color, peel puffing, peel proportion to fruit weight, fruit quality, soluble solid concentration and citric acid contents. 5) In plots where bromacil was annually applied for five years at 900g per 100m^2, chemical analysis of the peel and juice harvested showed no residue of bromacil.
日本雑草学会の論文
1978-08-25

温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第3報ミカンの生育,収量ならびに果実品質に及ぼす影響

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温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第3報 ミカンの生育,収量ならびに果実品質に及ぼす影響

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温州ミカン園におけるブロマシル除草剤の連年使用の影響に関する研究 : 第3報ミカンの生育,収量ならびに果実品質に及ぼす影響