Influência dos adubos amoniacais na ramificação da raiz principal da cenoura (Daucus carota L.)
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Data
1971-10
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Antônio Lopes da Silva
Resumo
Mísshap of carrot roots can be incited by soil agents, like badly prepared soil and nematodes or by ammonium fertilizers.
RALEIGH (Knott), cited by SILVA, found that ammonium fertilizers can kill the root and consequently cause malformation. The preference ot sodlum nitrate ar other non-ammonium fertilizers is widely spread in Brazilian literatura about carrot. MALAVOLTA (1967) even recomends only small quantities of manure to preveni root dammageREGINA (1964), advises against use of ammonium sulphate and other ammonium fertilizers for the sarne reason. CAMARGO (1963) also prefers sodlum nitrate but mentlons the possibllity of substitution by ammonium sulphate, too. Although, it was imposslble to find any origi· na\ experimental information about, in Brazilian literaure.
The sodium nitrate is imported by Brazil from Chile and is therefore almost five times more expensive than ammonium sulphate, in spite oi its \ower nitrogen content.
Thls triai investigated four sources of nitrogen: ammonium sulphate, sodium nitrate, urea and manure. The quantities applied were higher than MALAVOLTA recomends for carrot.
The results don't show any significant difference between treatments, neither in ramification frequence nor in yield. The varlety used was a cone-shaped carrot, named London. Other varieties possibly are•susceptible to malformation of root by ammonium fertilizers. This will be investigated in further experiments.
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ZICA, Lincoln F.; SONNENBERG, Peter E. Influência dos adubos amoniacais na ramificação da raiz principal da cenoura (Daucus carota L.). Anais da Escola de Agronomia e Veterinária, Goiânia, v. 1, n. 1, p. 22-26, jan./dez. 1971. Disponível em: <https://www.revistas.ufg.br/pat/article/view/1657/1624>.