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N, P and K fertilizer studies in pyrethrum (Chrysanthemum cinerariifolium)

Published online by Cambridge University Press:  27 March 2009

B. R. Rajeswara Rao ,
S. P. Singh  and
E. V. S. Prakasa Rao
B. R. Rajeswara Rao
Affiliation:
Central Institute of Medicinal and Aromatic Plants Regional Centre, Kodaikanal 624 101, India
S. P. Singh
Affiliation:
Central Institute of Medicinal and Aromatic Plants Regional Centre, Kodaikanal 624 101, India
E. V. S. Prakasa Rao
Affiliation:
Central Institute of Medicinal and Aromatic Plants Regional Centre, Bangalore 560 037, India
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Extract

Pyrethrum is a small bushy perennial crop cultivated for its flowers which have insecticidal properties. Pyrethrins, the active principles in the flowers, are contact insecticides causing nervous breakdown leading to paralysis and death of insects. Kroll (1963) and Parlevliet, Muturi & Brewer (1968) have shown that the flower yields of pyrethrum could be improved by applying P fertilizer whereas N and K fertilizers did not increase the yields. On the other hand, Mwakha (1979a, b) showed that pyrethrum responds to N fertilizer on soils deficient in N. The present investigation was carried out to study the response of pyrethrum to various rates of application of N, P and K and sources of phosphorus.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 100 , Issue 2 , April 1983 , pp. 509 - 511
Copyright
Copyright © Cambridge University Press 1983

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References

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