Observações sôbre o efeito da luz no crescimento da tiririca, Cyperus rotundus L.

Magalhães, Antonio Celso Novaes de

doi:10.1590/s0006-87051967000100009

Cited by 5 publications

(2 citation statements)

References 6 publications

(3 reference statements)

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“…Magalhaes (14) reported that shading with varying thicknesses of cotton cloth to produce shades of 85 and 92.5% of full sun reduced the growth and tuber formation by approximately 60% in Brazil. Hauser (9) also reported a 10 to 57% reduction in the number of tubers and basal bulbs that were formed when shaded with a plastic screen which gave 72% shade.…”

Section: Volume 23 Issue 4 (July) 1975mentioning

confidence: 99%

“…These experiments revealed many cropping practices which can be managed to decrease the competitive growth of nutsedge and favor crop develop ment. For example, several competitive cover crops (14) and a few commercial crops such as sweet potato [Ipomea batatas (L.) Lam.] (8) have effectively reduced the population of nutsedge in heavily infested fields.…”

Section: Competitive Cropping Practicesmentioning

confidence: 99%

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Competition Between Purple Nutsedge and Vegetables

William

Warren

1975

Weed sci.

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Competition studies were conducted in Brazil during 1972 and 1973 between high populations (160 plants/0.1 m2at 5 to 7 weeks after planting) of purple nutsedge (Cyperus rotundusL.) and the following vegetable crops: garlic (Allium sativumL. ‘Mineiro’), okra (Hibiscus esculentusL. ‘UFV 1152’), carrot (Daucus carotaL. ‘Nantes’ and ‘Kuroda’), bush-type green bean (Phaseolus vulgarisL. ‘Topcrop’), cucumber (Cucumis sativusL. ‘Aldai’), transplanted cabbage (Brassica oleraceaL. var. capitata ‘Louco’) and transplanted tomato (Lycopersicon esculentumMill. ‘Santa Rita’). Purple nutsedge grew all year with irrigation, although growth was greater during the warm, wet season (October to March). Crop losses due to purple nutsedge competition during the entire cropping season were as follows: garlic 89%; okra 62%; two carrot cultivars, ‘Kuroda’ and ‘Nantes’ 39% and 50%, respectively; green bean 41%; cucumber 43%; cabbage 35%; and tomato 53%. Critical periods of purple nutsedge competition occurred between 3 and 13 weeks for garlic; 3 and 7 weeks for okra, cucumber and the carrot cultivar ‘Nantes’; 3 and 5 weeks for tomato and the carrot cultivar ‘Kuroda’; and at approximately 4 weeks for cabbage and green bean. Purple nutsedge competed for light in the slow-growing, non-competitive crops and for nutrients in all crops. Competition for water was reduced because the vegetables were irrigated regularly. The rate of leaf area development for a competitive crop, green bean, was similar to the rate for purple nutsedge, whereas the rate was much lower for the non-competitive okra.

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Section: Volume 23 Issue 4 (July) 1975mentioning

confidence: 99%

Section: Competitive Cropping Practicesmentioning

confidence: 99%

Competition Between Purple Nutsedge and Vegetables

William

Warren

1975

Weed sci.

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Incident photosynthetically active radiation as a basis for integrated management of purple nutsedge (Cyperus rotundus)

Neeser¹,

Agüero²,

Swanton³

1997

Weed sci.

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Artificial shading studies indicated that competition for photosynthetically active radiation (PAR) will limit tuber production in purple nutsedge. There were no data available to test whether there is a relationship between incident PAR underneath crop canopies and tuber production of this weed. In this study, the effect of crop competition on net reproductive rates of purple nutsedge tubers was measured under field conditions. Purple nutsedge plants were grown in association with bush beans, maize, maize and beans intercropped, sweet potato, pole beans, and bell pepper in a 2-yr field study in Costa Rica. Measurements were taken on the number of tubers produced during the growing season of each crop, and PAR transmittance was monitored weekly for the duration of the respective cropping cycles. Data on transmittance and incident solar radiation were used to calculate the daily average amount of PAR, available 15 cm above the soil surface. Regressions indicated that average incident PAR accounted for 95% of the variation in net reproductive rates. Average incident PAR also allowed a more precise competitive ranking of crops than either average or minimum transmittance. Bush beans had consistently the lowest average incident PAR values and therefore ranked as the most competitive crop in both years. Our data suggest that no net increase in tuber populations occurs if average incident PAR is below 2.7 MJ m−2d−1. Differences in the duration of the cropping cycle accounted only for a small proportion of the overall variation in net reproductive rates of purple nutsedge tubers. Information on the competitive ranking of different crops can be used to design crop rotations that could reduce reliance on herbicides on small farms in Costa Rica.

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Studies of the Biology ofCyperus RatundusL Early Growth and Vegetative Reproduction Strategy

Nyahoza

1973

East African Agricultural and Forestry Journal

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Observações sôbre o efeito da luz no crescimento da tiririca, Cyperus rotundus L.

Cited by 5 publications

References 6 publications

Competition Between Purple Nutsedge and Vegetables

Competition Between Purple Nutsedge and Vegetables

Incident photosynthetically active radiation as a basis for integrated management of purple nutsedge (Cyperus rotundus)

Studies of the Biology ofCyperus RatundusL Early Growth and Vegetative Reproduction Strategy

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