草地におけるメヒシバの発生・繁茂に及ぼす施肥,刈取りの影響

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In order to prevent D. ciliaris infestation into a sward, the effect of fertilizer application and cutting on the growth of D. ciliaris was evaluated. The results obtained are as follows. 1 . During the period with high air temperature from July to August, D, ciliaris showed a remarkable increase in plant height , in contrast to other grasses such as orchardgrass and tall fescue (Fig. 2) . 2 . In a sward in which the area of bare ground was kept minimum by the application of low levels of fertilizer in the summer and cutting performed at 8 week intervals from July through October , D. ciliaris infestation was inhibited , a high yield of grass was obtained and a high population density of grasses was maintained . There was a negative correlation between the annual yield of D. ciliaris and both the annual grass yield and maintenance rate of grasses including five species such as orchardgrass , perennial ryegrass , tall fescue , redtop and Kentucky bluegrass . 3 . Infestation of D. ciliaris into a sward resulted in the decrease of the total production of grasses after July, and intensified the seasonal trend of decreased production of grasses in summer and autumn (Fig . 4) . Though the digestibility of D. ciliaris in July and August was superior to that of orchardgrass and tall fescue, it was lower in September and October . The number of calories and content of crude protein of D. ciliaris in July and October showed low values compared with the corresponding values for the grasses (Table 4) . 4 . Discontinuation of cutting during on 8 week period after early July , seemed to be on effective means to prevent D, ciliaris infestation into the sward (Table 5) .
日本雑草学会の論文
1988-05-26

草地におけるメヒシバの発生・繁茂に及ぼす施肥,刈取りの影響

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