Efeito de doses de nitrapirina (2-cloro-6-triclorometil piridina), na nitrificação do sulfato de amônio e da uréia, em dois solos (LE e Pml) do Estado de São Paulo

Effects of nitrapyrin (2-chloro-6-trichloromethyl pyridine) rates on the nitrification of ammonium sulphate and urea, In a latosol (LE) and podzolic soil (Pml) of the State of São Paulo

Efeito de doses de nitrapirina (2-cloro-6-triclorometil piridina), na nitrificação do sulfato de amônio e da uréia, em dois solos (LE e Pml) do Estado de São Paulo^*

Effects of nitrapyrin (2-chloro-6-trichloromethyl pyridine) rates on the nitrification of ammonium sulphate and urea, In a latosol (LE) and podzolic soil (Pml) of the State of São Paulo

A.P. Cruz^I; A.M.L. Neptune^II; T. Muraoka^III

^IDepartamento de Agronomia, Universidade de Taubaté, SP

^IIDepartamento de Solos, Geologia e Fertilizantes, ESA "Luiz de Queiroz", USP

^IIICentro de Energia Nuclear na Agricultura, USP

RESUMO

Foram adicionados aos solos LE e Pml 36 ppm de N, na forma de sulfato de amonio e uréia, com 0; 1,2; 2,4 e 4,8 ppm de nitrapirina. Os solos foram incubados por 150 dias à temperatura entre 25ºC e 30ºC, com 75% do seu poder de embebição. Aos 50, 100 e 150 dias de incubação, procedeu-se a determinação dos teores de NO^-₃ e calculou-se a porcentagem de inibição da nitrificação nos tratamentos com nitrapirina

Verificou-se que o teor de NO^-₃ no solo diminui significativamente, quando o sulfato de amonio e a uréia são associados com nitrapirina. A nitrapirina inibe igualmente a nitrificação do sulfato de amonio e da uréia, e apresenta inicialmente porcentagem de inibição da nitrificação (1%) no LE que no Pml. O tempo de ação da nitrapirina no solo ultrapassa 150 dias.

SUMMARY

36 ppm of N, as ammonium sulphate or urea, was added to the latosol (LE) and podzolic (Pml) soils, with 0 1.2, 2.4and 4.8 ppm of nitrapyrin. The soils were incubated during 150 days at temperatures between 25ºC 30ºC and at field capacity. The NO^-₃ concentration and the effect of nitrapyrin on nitrification inhibition was estimated.

It was observed that the soil NO^-₃ concentration decreased significantly when ammonium sulphate and urea were associated with nitrapyrin. This indicated that nitrapyrin inhibited the nitrification of ammonium sulphate as well as of urea and showed initially greater percentage of inhibition of nitrification in LE than Pml soil. The time of action of nitrapyrin in the soil passed beyond 150 days.

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LITERATURA CITADA

Entregue para publicação em 31/12/82.

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*

Trabalho patrocinado pela "Dow Química S/A" e Projeto Uréia (Petrofértil/ Nitrofértil-NE/ Ultrafértil S.A./ ESALQ).

Datas de Publicação

• Publicação nesta coleção
  09 Abr 2012
• Data do Fascículo
  1982

Histórico

• Recebido
  31 Dez 1982