Abstract
These experiments were carried out to study the properties of a plant growth regulator, Diaminomaleonitrile (DAMN).
(1) It was apparently recognized that the growth of herbaceous cutting of chrysanthemum was stimulated by treatmant of 24 hourss at 50 to 100 ppmw water solution of DAMN, for such a kind of Gay Anne (American potmum species). And, under conditions both of water cultivation and propagation bed, such as vermiculite plus river sand, the growth effect was shown to be the same as β-IAA or α-NAA, on the root numbers, rooted stamp numbers, root length, root weight and leaf fresh weight.
(2) The most adequate concentrations due to the treatment for 24 hours of DAMN water solution for many kinds of chrysanthemum were 25 to 100 ppmw to Gay Anne, Otomezakura (lemon yellow) and Beniotome (violet), 25 ppmw to Ryunotama, 50 to 100 ppmw to Soannoaki, Otomezakura (white) and Shimizunokagayaki, 50 ppmw to Unzen and 100 ppmw to Whitealps.
(3) When the talc formulation is treated for chrysanthemum herbaceous cutting, the most effective DAMN concentration is 0.25 to 0.5 percent in active ingredient.
(4) The root growth of chrysanthemum herbaceous cutting accelerated particularly in several propagation beds. And the descending order of the effect among them was shown as river sand=Kanuma soil>vermiculite>river sand plus vermiculite.
(5) The root growth of chrysanthemum herbaceous cutting was examined by using many DAMN formulations. The most adequate carrier were zeeklite, clay (comercial name is Fubasami clay) and talc. Besides, the formulations of perlite and kaolin were fairly good.
(6) When the root of chrysanthemum herbaceous cutting was grown by DAMN talc formulation, the most effective treatment length was the range of 1 to 2cm from cutting section.
(7) The chrysanthemum herbaceous cutting treated by DAMN talc formulation, begins the rooting 10 days after treatment. It was assumed that the adequate transplanting time is on the 27 to 34 days after placing in propagation bed.
