タイヌビエの葉齢進展の推定法とプレチラクロールの散布適期の表示方法

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概要

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• The changes in the leaf number of Echinochloa oryzicola VASING.were observed in transplanted rice fields at Ono (Central Japan) during the 1982-87 cool and warm seasons. The influence of the deducted value from the mean daily air temperature on the relationship between the leaf number and accumulated temperature after the puddling date was statistically analyzed. In addition, the herbicidal activity of pretilachlor [2-chloro-2',6'-diethyl-N-(propoxyethyl)acetanilide] on the grass was investigated in the field with particular reference to the means of expressing the application time. 1) The relationship was well expressed by the equation L= a+bT, where L is the maximum leaf number at each observation and T is the accumulated air temperature after puddling, with a high coefficient of correlation in the seasons of each year regardless of the deducted value. The relationship in each season over the years and that over the seasons and years were also well expressed by the equation with high coefficients of correlation except in the cool season when 12℃ was deducted (Table 3). 2) When 6℃ was deducted, the highest coefficient of correlation for the relationship over the seasons and years was obtained (Table 3) and the seasonal difference in "a" and "b" was statistically not significant (Table 4). The yearly difference, however, in "b" in the cool season and in a in the warm season was still statistically significant. 3) It was then concluded that the relationship over the seasons and years can be best expressed when 6℃ was deducted: the equation obtained was L = -0.815+0.016T (r =0.973. T : 6℃-deducted accumulated temperature after puddling). The difference between the observed and calculated leaf number based on the equation was 0.0±0.1 leaf (confidence interval at 99%) . 4) The coefficient b in cool years was higher than in warm years (Fig. 1). No climatic factors analyzed could account for the yearly fluctuations of "a". 5) When the application time was expressed by the median or the maximum value of the leaf number at application, there was no seasonal difference in the relationship between the application time and the pretilachlor activity on the grass (Fig. 2). 6) The relationship between the application time and the pretilachlor activity was also well revealed when the time was expressed by the calculated leaf number based on the above-mentioned equation L = -0.815+0.016T (Fig. 3).

• 日本雑草学会の論文
• 1990-10-30

著者

• 村上 士明

  日本チバガイギー(株)

• 阪上 和久

  日本チバガイギー

• 馬庭 義則

  日本チバガイギー

関連論文

• 38 イヌホタルイの発生消長と葉齢進展 : タイヌビエとの比較
• Pretilachlor : アミド系除草剤 : 除草剤解説(26)
• Metolachlor : アミド系除草剤 : 除草剤解説(25)
• タイヌビエの葉齢進展の推定法とプレチラクロールの散布適期の表示方法
• 温室におけるプレチラクロールのイネとタイヌビエに対する除草活性の検討
• 12 シノスルフロン混合剤(CG-155B【○!L】)のタイヌビエ・イヌホタルイに対する効果と変動要因
• 58 タイヌビエの発生消長と葉齢進展
• 93 水稲除草剤プレチラクロール(CG 113)の作用性 : 第1報 イネ・タイヌビエ間の選択性機構
• ピペロホス : 14.有機燐系除草剤 : 除草剤解説(4)
• ジメタメトリン : 10.s-トリアジン系除草剤 : 除草剤解説(3)
• 4. 除草剤CG102(ピペロホス+ジメタメトリン)の作用性 (II)
• 3. 除草剤CG102(ピペロホス+ジメタメトリン)の作用性 (I)

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