水田雑草の養分吸収特性の車種間差 : 第1報混植による窒素吸収カの推定

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The competition for growth and nitrogen absorption of paddy weeds (Echinochloa crus-galli, Monochoria vaginalis, Cyperus difformis Cyperus serotinus, Eleocharis kuroguwai, Sagittaria trifolia, Alisma canaliculatum, Scirpus juncoides, Scirpus wallichii) was studied in mixed planting. The results obtained were as follows: 1) Echinochloa crus-galli, Cyperus serotinus and Monochoria vaginalis had a large capacity to absorb nitrogen fertilizer and overgrew the other weeds. Nitrogen utilization efficiency defined by the relationship between nitrogen absorption and dry weight increase varied with the weed species and three groups of weeds could be identified. The first group was composed of Echinochloa crus-galli and Cyperus serotinus, both C_4 plants, with a high efficiency in nitrogen utilization. Sagittaria trifolia and Alisma canaliculatum formed the third group with a low efficiency. The second group was composed of the remaining weeds which showed an intermediate efficiency between that of the first and the third groups. 2) Growth inhibition of rice caused by weeds varies with the fertilizer level and weed species. Monochoria vaginalis was a noxious weeds to rice at a low fertilizer level. Echinochloa crus-galli and Cyperus serotinus grew vigorously at a high fertilizer level, reflecting their high efficiency in nitrogen utilization. Cyperus difformis and Scirpus wallichii showed poor growth at a high fertilizer level and were affected by shading from rice. The ratio of weed weight to total community weight was found to be a suitable index for the evaluation of interspecific competition between rice and weeds, since the variations caused by the difference in fertilizer levels could be disregarded.
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1報混植による窒素吸収カの推定

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水田雑草の養分吸収特性の車種間差 : 第1報 混植による窒素吸収カの推定

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水田雑草の養分吸収特性の車種間差 : 第1報混植による窒素吸収カの推定