神奈川県におけるミズガヤツリの種内変異と防除上の特性に関する研究 : 第4報形態特性の異なる系統の直播水稲の生育収量に及ぼす影響

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In order to analyse the difference in the competitive effect of some strains of C. serotinus R. on paddy rice, three typical strains (Shinyoshida, Kamigo, Wadahara) which originated from different districts in Kanagawa and showed the variations in ecological and morphological characters described in a previous report were planted at four tuber planting densities (0, 2, 8, 16/m^2) in fields with direct seeded paddy rice in a split design with three replications in May 1975. 1) Differences in the time of tuber emergence, heading time, leaf area, dry leaf and stalk weight, and fresh tuberweight among the strains were observed. Of all the correlations between these characters and rice yield, a negative correlation coefficient ( r = -0.758***~-0.889***) was obtained. 2) The productive structures of C. serotinus varied with the strains, especially the difference in leaf area at a higher level (over 80cm) among strains was remarkable. Leat area of the Shinyoshida strain was larger than that of the Kamigo and wadahara strains, that of Wadahara being the smallest. These reults suggest the presence of intraspecific differences in light competitive effect between C. serotins and rice. 3) Statistical analysis showed significant differences at 0.1 percent level in the yield among the plots with different tuber planting densities. In each plot, significant differences in yield among the strains were recognized at 5~0.1 percent level, and yield reduction in Shinyoshida plot was more appreciable than in the Kamigo and Wadahara plots. These yield reduction were associated primarily with the decrease in panicle number, grain number per panicle and grain number per m^2. 4) The differences in the ecological and morphological characters of the strains were reflected in the variations of their competitive effect on rice yield. Shinyoshida strain was most competitive to rice from the tillering to maturing stages of rice for both nutrients and light. 5) These differences in the competitive effects of the strains on paddy rice suggest the importance of the recognition of variations in strains in investigations dealing with weed competition and forecasting of weed damage as well as differences between weed species.
1985-10-28

神奈川県におけるミズガヤツリの種内変異と防除上の特性に関する研究 : 第4報形態特性の異なる系統の直播水稲の生育収量に及ぼす影響

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神奈川県におけるミズガヤツリの種内変異と防除上の特性に関する研究 : 第4報 形態特性の異なる系統の直播水稲の生育収量に及ぼす影響

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神奈川県におけるミズガヤツリの種内変異と防除上の特性に関する研究 : 第4報形態特性の異なる系統の直播水稲の生育収量に及ぼす影響