Data/hora: 18/06/2024 23:45:52

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 07/02/1996
Data da última atualização: | 07/02/1996
Autoria: | FANG, H. C.; LIU, T. M. E.
Afiliação: | National Taiwan University.
Título: | Effect of urea and nitrogenous compounds on the Sclerotial germination and viability of the Sclerotium rolfsii in soil and its relationship with soil and its relationship with soil microorganisms.
Ano de publicação: | 1988
Fonte/Imprenta: | Plant Protection Bulletin Taipei, v.30, p.235-244, 1988.
Idioma: | Japonês
Conteúdo: | There was a significant reduction of germination and viability of sclerotia of Sclerotium rolfsii in natural sandy loam soil which was amended with nitrogenous compounds such as urea, ammonium sulfate, ammonium nitrate,ammonium chloride, sodium nitrite and potassium nitrite respectively. However,such effects were absent in sterilized soil except nitrite salts. When the conidial suspension of either Trichoderma harzianum or Fusarium ventricosum, or 0.1% (w/w) urease alone was added intothe urea amended sterilized soil, the same effects were observed. Either T.harzianum or F. ventricosum alone in sterilized unamended soil did not inhibit the germination and viability of sclerotium. The urea could not enhance the population density of T.harzianum or F.ventricosumin sterilized soil as compared with urea unamended one. Among the ten kinds of microorganisms isolated from soil, only F. ventricosum, T. harzianum, Penicillium corylophilum and four unidentified fung could produce urease. When these urease producers were incorporated into the urea amended sterilized soil in the form of conidia or mycelial mats, respectively, they inhibited the germination and viability of S. rolfsii. conversely, the other three microorganisms which could not produce urease showed no effects. The urease was effective at the minimum of 50 ug in 100g sterilized soil containing 0.06% (w/w) urea in inhibiting the germination of the sclerotium completely. All sclerotia died when urease exceeded 100ug. However, when 10ug urease was added to...
Palavras-Chave: | Adubacao nitrogenada; Germinacao de esclerocio; Microorganismos do solo; Nitrogen fertilizer; Sclerotial germination.
Thesagro: | Sclerotium Rolfsii.
Thesaurus Nal: | soil microorganisms.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (4977-1) - ADC - SP - -- -  -  - 1994.05245 - DIS