. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XI. No. 268. THE AGRICULTURAL NEWS. ;.Do INFLUENCE OF LIGHT ON GERMINA- TION. The following is part of an abstract appearing in the Journal of the Board of Agriculture, for June 1912, p. 231, of a paper appearing in Praktische Blotter far Pjianzenhau unci -^c/aiis, dealing with investiga- tions concerning the influence of light and temperature on the germination of seeds:— Investigations earned out at the Institute at Munich have shown that different seeds are differently affected by light; thus fresh seeds of
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XI. No. 268. THE AGRICULTURAL NEWS. ;.Do INFLUENCE OF LIGHT ON GERMINA- TION. The following is part of an abstract appearing in the Journal of the Board of Agriculture, for June 1912, p. 231, of a paper appearing in Praktische Blotter far Pjianzenhau unci -^c/aiis, dealing with investiga- tions concerning the influence of light and temperature on the germination of seeds:— Investigations earned out at the Institute at Munich have shown that different seeds are differently affected by light; thus fresh seeds of Ni'jeUa satiin did not germinate in a seed bed open to the light, but when claced in the dark the whole of the seeds germinated after ten days. The seeds of many Liliaceae were found to behave similarly, though here the action of light depended on the temperature, germination being seriously hindered by the light only in temperatures above G8°F. On the other hand, about 20C species including Vercy- nica officinalis could not be germinated in the dark; when brought suddenly into the light, however, after being kept for three years in the dark, they were found to germinate in a very short time. In many cases only a small amount of light was necessary for germination. Lights of different colour were noticed to act in different ways. A blue light was found to act in the .same way as darkness, and had the additional effect of preventing the growth of harmful fungi and bacteria; 100 seeds of Tofieldia were kept for four years under a blue light and not one died. Germination ensued immediately on changing the blue to a red or white light. On the other hand, a blue light seemed to favour germination in the case of seeds which germinate in the dark, while red was unfavourable. The sudden appearance of large numbers of some varieties of weeds in fields seems to be by the fact that in many cases germination is more complete and rapid where seeds have been kept for a conside
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