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Spacing and nitrogen studies in pyrethrum (Chrysanthemum cinerariifolium)

Published online by Cambridge University Press:  27 March 2009

B. R. Rajeswara Rao  and
S. P. Singh
B. R. Rajeswara Rao
Affiliation:
Central Institute of Medicinal and Aromatic Plants, Regional Centre, Kodaikanal 624101, India
S. P. Singh
Affiliation:
Central Institute of Medicinal and Aromatic Plants, Regional Centre, Kodaikanal 624101, India
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Extract

Pyrethrum flowers are widely used in different insecticidal formulations for controlling household insects and crop pests. The quick knock-down effect on insects, the low mammalian toxicity and the rapid decomposition of pyrethrins in the soil make it an ideal and safe insecticide. The flower yield in pyrethrum is influenced by plant population density and phosphate fertilizer application (Nair, 1955; Kroll, 1962, 1963; Parlevliet, Muturi & Brewer, 1968a, b). Parlevliet et al.(1968a, b) recommended a spacing of 60 × 30 cm whereas Nair (1955) suggested a spacing of 75 × 60 cm for obtaining higher flower yields in this crop. The present investigation was made to compare the effects of different spacings and rates of nitrogen application on the flower and pyrethrin yields of pyrethrum.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 99 , Issue 2 , October 1982 , pp. 457 - 459
Copyright
Copyright © Cambridge University Press 1982

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References

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