Ecological studies on the conditions and emergence of propagules in Sagittaria trifolia L., a perennial paddy weed. V. Factors controlling seasonal variations in the development and emergence of tubers in paddy fields.:V. Factors Controlling Seasonal Vari

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Seasonal variations in the emergence of propagules from tubers in an arrowhead (Sagittaria trifolia L.) under natural conditions in a paddy field and in concrete pots were analyzed in relation to the changes in soil moisture. To analyze the emergence from the tuber, combinations of changes in the period of initial flooding, depth of burial of tubers, tuber size as well as degree of reduction of submerged soil and soil temperature were tested in the laboratory or in the fields.The results obtained are as follows1) Slow emergence from late-June (after puddling time) to early-August (mid-summer drainage time) was observed in rice fields under normal season culture. Continuous emergence with a small peak after puddling time and larger peak after mid-summer drainage time was observed in concrete pots under appropriate drainage conditions.2) Also continuous emergence from early-May to late-August was observed in concrete pots under ill-drained conditions under early season and normal season rice culture.3) The changes in the period of emergence from the tubers were associated with the time when flooding started, depth of burial of tubers and tuber size. Especially, the emergence was remarkably slow when flooding started in May under early season rice culture as tuber dormancy was not broken at the start of flooding.4) The elongation of the terminal buds of the tubers in which dormancy was broken in water in the dark, was faster of a constant temperature of 25°C than of 20 or 30°C. At 10 or 40°C few tubers elongated.5) The larger the quantify of starch added to soil, the later the emergence and the lesser the soil reduction, the faster the elongation of the tuber buds in puddled soil.6) The relationships between the methods of weed control and emergence of the weed in paddy fields were analyzed.
日本雑草学会の論文

Ecological studies on the conditions and emergence of propagules in Sagittaria trifolia L., a perennial paddy weed. V. Factors controlling seasonal variations in the development and emergence of tubers in paddy fields.:V. Factors Controlling Seasonal Vari

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日本雑草学会 | 論文

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