Effect of nitrogen fertilization on the phenomena of resistance of horse weed ( Conyza linifolia, Tacke ) biotypes to bipyridylium herbicides
Abstract: Two pot experiments were conducted during 1983/1984 and 1984/1985 seasons, to study the response of both paraquat-resistant and susceptible conyza linifolia biotypes to diquat and paraquat herbicides under different levels of N-fertilization. Plants of paraquat-resistant biotype (from Tahrir governorate region) , showed a little reduction in number of survivals/pot and in dry weight of both leaves and stems/pot as comaperd with paraquat-susceptible biotype (from faculty of agriculture, Ain shams at Shoubra El-Kheima) . Diquat was slightly more toxic than paraquat on both biotypes in most cases. paraquat-resistant biotypes was resistant to diquat as to paraquat (both from the same chemical group of bipyridylium derivatives) . Results proved also that herbicidal toxicity of diquat or paraquat to above-ground parts of plants of both biotypes tended to increase under N-fertilization , which increased number and size of their above-ground parts to be exposrd largely to spray retention and interception of such herbicides .
Publication year 1989
Pages 953-965
Availability location المعمل المركزي لبحوث الحشائش- مركز البحوث الزراعية -ش الجامعه - الجيزة
Availability number
Organization Name
serial title Annals of Agri. Sci.
Author(s) from ARC
External authors (outside ARC)
    Rizk, T. Y. كلية الزراعة-جامعة عين شمس- قسم المحاصيل
    Fayed, M. T. كلية الزراعة-جامعة عين شمس- قسم المحاصيل
Agris Categories Weeds and weed control
AGROVOC
TERMS		 Biotypes. Herbicides. Nitrogen fertilizers. Resistance to chemicals.
Publication Type Journal
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