エゾノギシギシの防除に関する生態学的研究 : 第5報窒素施肥レベルがエゾノギシギシの生育および体内無機成分におよぼす影響

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In order to obtain basic information for the control of Rumex obtusifolius L., an aggressive weed in grasslands, the effects of nitrogen levels (0, 1, 2, 4 and 8 g/a/2,000 Wagner pot) on the growth and chemical composition of this weed were determined. Three types of plants differing in age, i. e. plants sown in spring, autumn of the preceding year and adult type, were used for this experiment. The results obtained are as follows: 1. Plant length showed the lowest values at a N level of 0 g in all the types. Among the other N levels, the spring sown type showed similar length, while in the autumn sown type plant length showed the highest values at a N level of 4 g , and in the adult type plant length was slightly reduced at a N level of 8 g . 2. The number of leaves varied remarkably among the nitrogen levels. For all the types, the lowest number of leaves was observed at a N level of 0 g , followed by N 1 g . A remark-able reduction was noted at a N level of 0 g in the spring and autumn sown types. The number was greatest at a N level of 4 g in all the types. 3. The top fresh weight increased with increasing nitrogen levels up to 8 g N in the spring sown and adult types, and with increasing nitrogen levels up to 4 g N in the autumn sown type. The root fresh weight showed the highest values at a N level of 2 g in the autumn sown type, while in the spring sown and adult types the weight was slightly lower at a N level of 0 g , with few differences among the other nitrogen levels. 4. The top dry weight increased with increasing nitrogen levels up to 4 g N in the all types. The trend in root dry weight was almost similar to that of the fresh weight. 5. The contents of N, P, K, Ca and Mg varied among the nitrogen levels, but no clear difference was observed among the types. 6. Chemical composition in roots of the autumn sown type appeared to be more affected by the nitrogen levels than in the other types and other organs. These results suggest that the effect of nitrogen levels on the growth and chemical composition of this weed is significant and varies with the plant age.
日本雑草学会の論文
1987-05-26

エゾノギシギシの防除に関する生態学的研究 : 第5報窒素施肥レベルがエゾノギシギシの生育および体内無機成分におよぼす影響

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エゾノギシギシの防除に関する生態学的研究 : 第5報 窒素施肥レベルがエゾノギシギシの生育および体内無機成分におよぼす影響

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エゾノギシギシの防除に関する生態学的研究 : 第5報窒素施肥レベルがエゾノギシギシの生育および体内無機成分におよぼす影響