水田雑草の養分吸収特性の車種間差 : 第2報生育経過および光・温度に対する反応

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The growing process and response to light and temperature of rice and paddy weeds (Echinochloa crus-galli, Monochoria vaginalis, Cyperus difformis, Cyperus serotinus, Eleocharis kuroguwai, Sagittaria trifolia, Alisma canaliculatum, Scirpus juncoides) were investigated. The results obtained were as follows: 1) Cyperus serotinus, Echinochloa crus-galli and Sagittaria trifolia showed the most rapid initial growth follwed by the remaining weeds. In Cyperus serotinus, both the dry weight and nitrogen absorption were higher than in the other species. Dry weight Λalues decreased in the order of Eleocharis kuroguwai, rice (transplanted), Echinochloa crus-galli, rice (direct seeding), Sagittaria trifolia and nitrogen absorption values in the order of Sagittaria trifolia, rice (transplanted), Eleocharis kuroguwai, Echinochloa crus-galli, rice (direct seeding). The dry weight and nitrogen absorption of Cyperus difformis, Monochoria vaginalis and Scirpus juncoides were far below those of the other species listed above. 2) The response to shading varied with the weed species. Sagittaria trifolia and Eleocharis kuroguwai were comparatively tolerant, while in Cyperus difformis and Scirpus juncoides the dry weight was remarkably decreased by shading. Depression of the growth of weeds by low temperature varied with the species. Cyperus serotinus, Sagittaria trifolia and Alisma canaliculatum grew vigorously at a low temperature, compared with Monochoria vaginalis, Eleocharis kuroguwai and Cyperus difformis. Rice showed comparatively poor growth under low temperature and shading.
日本雑草学会の論文
1984-09-27

水田雑草の養分吸収特性の車種間差 : 第2報生育経過および光・温度に対する反応

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水田雑草の養分吸収特性の車種間差 : 第2報 生育経過および光・温度に対する反応

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水田雑草の養分吸収特性の車種間差 : 第2報生育経過および光・温度に対する反応