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Weed competition in narcissus crops


, : Weed competition in narcissus crops. Acta Horticulturae 2(23): 5

Research, conducted in Scotland and Holland, concerning the direct effects of competition by weeds on the growth of narcissus is discussed. The modifying effects of growing systems, crop cvs., weed flora and climate are outlined briefly. Experimental data suggest that competition is most likely to take place during the period of flower initiation and maximum bulb growth, and that this may result in adverse effects on bulb yield and subsequent flower production.


Accession: 000263252

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Related references

Friesen, G., E.Al., 1960: Economic losses caused by weed competition in Manitoba grain fields. 2. Effect of weed competition on the protein content of cereal crops. Economic losses caused by weed competition in Manitoba grain crops were studied on 142 farm fields during the 3-year period 1956-8. Ten paired plots were located in each farm field, one-half of each paired plot being kept weed-free throughout the...

G.Friesen, L.H.Shebeski, A.D.Robinson, 1960: Economic losses caused by weed competition in manitoba grain fields: ii. effect of weed competition on the protein content of cereal crops. Economic losses caused by weed competition in Manitoba grain crops were studied on 142 farm fields during a 3-year period, 1956 to 1958 inclusive. Ten paired plots were located in each farm field, one-half of each paired plot being kept weed-free...

Wells G.J., 1979: Annual weed competition in wheat crops the effect of weed density and applied nitrogen. Experiments investigating the effect of weed density on the yield of a wheat crop at 3 levels of applied nitrogen were conducted in northwestern Victoria, Australia during 1970. There were five sites, each infested with a pure stand of one of the...

Chisaka, H., 1977: Weed damage to crops: yield loss due to weed competition. The harmful effects of weeds in or near cultivated fields are enumerated and an expression is derived for the estimation of yield losses as a result of weed competition, based on field experiments with rice infested with Echinochloa crus-galli. Th...

Iwata, I.; Takayanagi, S., 1980: Studies on the damage to upland crops caused by weeds. 2. The effects of weed competition on the growth and yield of crops. Weeding reduced [final] populations of broad-leaved weeds, umbrella sedge [Cyperus difformis?] and late emerging grasses in upland crops, especially in narrow row crops. Weed competition decreased tillering or branching in upland rice, groundnut a...

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Ming-Y.L.Aldrich, R.J., 1958: An evaluation of weed competition with crops. In trials over 2 years weeds were allowed to compete with oats and maize for varying periods after emergence. In oats competition for more than 1 week caused highly significant yield reductions and reduced dry matter; more than 2 weeks significant...

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