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

Magalhães, Antônio Celso

doi:10.1590/S0006-87051967000100009

Resumos

Foram estudados: os efeitos do sombreamento de tiririca (Cyperus rotundusL.), no campo, com plantas de Canavalia ensiformisD.C.; a ação de luz artificial; o ponto de compensação de luz. o sombreamento reduziu drasticamente a multiplicação dos tubérculos. Plantas mantidas com luminosidade artificial de 15% da radiação solar tiveram o desenvolvimento subterrâneo muito prejudicado. A capacidade vegetativa da tiririca mostrou-se reprimida sòmente com redução acentuada da luminosidade.

The effect of shading induced by Jack bean plants on the growing of nutsedge was investigated. Three treatments were included: a) shading without root competition; b) shading plus competition of the root systems; c) competition of roots without shading. The control contained only nutsedge plants. Of the two factors involved in the association of the species, shading proved to be the most important in determining the inhibition in the growth of nutsedge. The effect of artificial shading on the developmental pattern of the nutsedge plants was also studied. The more intense the shade, the greater the decreasing in the growth rate of the nutsedge plants. Under conditions of 92.5% of shading the growth was inhibited in about 60% when compared with the control plants. The compensation point of light, determined colorimetrically, showed that the point of equilibrium between the photosynthetic and respiratory processes was attained in the range of 800 to 1,000 lux of light intensities. By considering that a 2.5-months-old Jack bean culture only allows 1 to 1.5% of the incident light to reach the soil surface, it can be assumed that the infestation of nutsedge should be lowered by the shading effect induced by the Jack bean plants.

Antônio Celso Magalhães

Engenheiro-agrônomo Seção de Fisiologia, Instituto Agronômico

SINOPSE

Foram estudados: os efeitos do sombreamento de tiririca (Cyperus rotundusL.), no campo, com plantas de Canavalia ensiformisD.C.; a ação de luz artificial; o ponto de compensação de luz. o sombreamento reduziu drasticamente a multiplicação dos tubérculos. Plantas mantidas com luminosidade artificial de 15% da radiação solar tiveram o desenvolvimento subterrâneo muito prejudicado. A capacidade vegetativa da tiririca mostrou-se reprimida sòmente com redução acentuada da luminosidade.

SUMMARY

The effect of shading induced by Jack bean plants on the growing of nutsedge was investigated.

Three treatments were included: a) shading without root competition; b) shading plus competition of the root systems; c) competition of roots without shading. The control contained only nutsedge plants. Of the two factors involved in the association of the species, shading proved to be the most important in determining the inhibition in the growth of nutsedge.

The effect of artificial shading on the developmental pattern of the nutsedge plants was also studied.

The more intense the shade, the greater the decreasing in the growth rate of the nutsedge plants. Under conditions of 92.5% of shading the growth was inhibited in about 60% when compared with the control plants.

The compensation point of light, determined colorimetrically, showed that the point of equilibrium between the photosynthetic and respiratory processes was attained in the range of 800 to 1,000 lux of light intensities.

By considering that a 2.5-months-old Jack bean culture only allows 1 to 1.5% of the incident light to reach the soil surface, it can be assumed that the infestation of nutsedge should be lowered by the shading effect induced by the Jack bean plants.

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LITERATURA CITADA

Recebido para publicação em 18 de outubro de 1966.

1. ANDERSEN, O. The physiological action of 3-amino-1,2,4-triazole on Nut Grass with special emphasis on Cyperus rotundus L. Tese PhD, Universidade da California, Davis, 182p. 1957. (Mimeo grafado)
2. CHRISTIE, G. A. Nut Grass. Plant Sci. 35(24):6036(71776). 1960.
3. COUTINHO, L. M. Algumas informaçőes sôbre a ocorręncia do "Efeito de De Saussure" em epífitas e herbáceas terrestres da mata pluvial. Fac. Filos. Cięncias e Letras, U.S.A. Bol. 288, p. 83-98. 1963.
4. DONALD, C. M. The interaction of competition for light and for nutrients. Aust. Jour. Agric. Res. 9:421-435. 1958.
5. HARRIS, V. C. Nut Grass control by competition. Miss. Farm Res. 21(2):8. 1958.
6. HAUSER, E. W. Establishment of nutsedge from space-planted tubers. Weeds 10(3):209-212. 1962.
7. ________ Development of purple nutsedge under field conditions. Weeds 10 (4) :315-321. 1962.
8. LOUSTALOT, A. J.; MUZIC, T. J. & CRUZADO, H. J. Studies on Nut Grass (Cyperus rotundus L.) and its control. Puerto Rico Fed. Exp. Sta. Bull. 52; 30p. 1954.
9. MENDES, C. T. A tiririca. Bol. Agric. 38:624-644. 1937.
10. NEME, N. A. Combate ŕ tiririca. Agronômico 12(11/12) :5-6. 1960.
11. ________; MIRANDA, H. S. & FDRSTER, R. A açăo da cultura de feijăo-de-porco no combate ŕ tiririca. In Cong. Pan Americano de Agronomia, II, 1954. Anais. p.261-262.
12. RANADE, S. B. & BURNS, W. The eradication of Cyperus rotundus L. Mem. Dept. Agr. India, Bot. Ser. 13(5):99-192. 1925.
13. SAEKI, T. Light relations in plant communities. In Evans, L. T., ed. Environmental control of plant growth, p.79-94. 1963.
14. SMITH, E. V. & FICK, G. L. Nut Grass erradication studies: I. The life history of Nut Grass, Cyperus rotundus L., to possible methods of control. Jour. Amer. Soc. Agron. 29:1007-1013. 1937.
15. ________& MAYTON, E. L. Nut Grass erradication studies: II. The erradication of Nut Grass,Cyperus rotundus L., by certain tillage treatments. Jour. Amer. Soc. Agron. 30:18-21. 1938.
16. ________ & ________ Nut Grass erradication studies. III. The control of Nut Grass, Cyperus rotundus L., on several soil types by tillage. Jour. Amer. Soc. Agron. 34:151-159. 1942.
17. VAILLANT, A. Observations sur deux Cyperus envahissants des cultures africaines dans les conditions du Nord Cameroun: C. maculatus Boeck, C. rotundus L. L'Agronomie Tropicale 10(1):112-114. 1956.

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

Studies on the effect of light upon nutsedge plants

Datas de Publicação

Publicação nesta coleção
24 Mar 2009
Data do Fascículo
Jan 1967

Histórico

Recebido
18 Out 1966

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] 1. ANDERSEN, O. The physiological action of 3-amino-1,2,4-triazole on Nut Grass with special emphasis on Cyperus rotundus L. Tese PhD, Universidade da California, Davis, 182p. 1957. (Mimeo grafado)

[2] 2. CHRISTIE, G. A. Nut Grass. Plant Sci. 35(24):6036(71776). 1960.

[3] 3. COUTINHO, L. M. Algumas informaçőes sôbre a ocorręncia do "Efeito de De Saussure" em epífitas e herbáceas terrestres da mata pluvial. Fac. Filos. Cięncias e Letras, U.S.A. Bol. 288, p. 83-98. 1963.

[4] 4. DONALD, C. M. The interaction of competition for light and for nutrients. Aust. Jour. Agric. Res. 9:421-435. 1958.

[5] 5. HARRIS, V. C. Nut Grass control by competition. Miss. Farm Res. 21(2):8. 1958.

[6] 6. HAUSER, E. W. Establishment of nutsedge from space-planted tubers. Weeds 10(3):209-212. 1962.

[7] 7. ________ Development of purple nutsedge under field conditions. Weeds 10 (4) :315-321. 1962.

[8] 8. LOUSTALOT, A. J.; MUZIC, T. J. & CRUZADO, H. J. Studies on Nut Grass (Cyperus rotundus L.) and its control. Puerto Rico Fed. Exp. Sta. Bull. 52; 30p. 1954.

[9] 9. MENDES, C. T. A tiririca. Bol. Agric. 38:624-644. 1937.

[10] 10. NEME, N. A. Combate ŕ tiririca. Agronômico 12(11/12) :5-6. 1960.

[11] 11. ________; MIRANDA, H. S. & FDRSTER, R. A açăo da cultura de feijăo-de-porco no combate ŕ tiririca. In Cong. Pan Americano de Agronomia, II, 1954. Anais. p.261-262.

[12] 12. RANADE, S. B. & BURNS, W. The eradication of Cyperus rotundus L. Mem. Dept. Agr. India, Bot. Ser. 13(5):99-192. 1925.

[13] 13. SAEKI, T. Light relations in plant communities. In Evans, L. T., ed. Environmental control of plant growth, p.79-94. 1963.

[14] 14. SMITH, E. V. & FICK, G. L. Nut Grass erradication studies: I. The life history of Nut Grass, Cyperus rotundus L., to possible methods of control. Jour. Amer. Soc. Agron. 29:1007-1013. 1937.

[15] 15. ________& MAYTON, E. L. Nut Grass erradication studies: II. The erradication of Nut Grass,Cyperus rotundus L., by certain tillage treatments. Jour. Amer. Soc. Agron. 30:18-21. 1938.

[16] 16. ________ & ________ Nut Grass erradication studies. III. The control of Nut Grass, Cyperus rotundus L., on several soil types by tillage. Jour. Amer. Soc. Agron. 34:151-159. 1942.

[17] 17. VAILLANT, A. Observations sur deux Cyperus envahissants des cultures africaines dans les conditions du Nord Cameroun: C. maculatus Boeck, C. rotundus L. L'Agronomie Tropicale 10(1):112-114. 1956.

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