Effects of biuret on sweet sorghum (Sorghum Bicolor L.) (Moench) evaluated by the development of plant

Abstract

This paper relates an experiment carried out at the Departamento de Solos, Geologia e Fertilizantes of the Escola Superior de Agricultura "Luiz de Queiroz" from the Universidade de São Paulo, Brazil, to observe the phytotoxic effects on sweet sorghum (Sorghum bicolor L.) of different doses of biuret added to urea and applied both to soil and leaves. Two types of soils were used-Sands Quartz and Terra Roxa, a clayish soil from the municipality of Piracicaba. The treatments were as fallows: 1. 1.15 g/N pot in soil 2. 1.15 g/N pot + 1% biuret in soil 3. 1.15 g/N pot + 2% biuret in soil 4. 1.15 g/N pot + 3% biuret in soil 5. 1.15 g/N pot, foliar application 6. 1.15 g/N pot + 1% biuret, foliar application 7. 1.15 g/N pot + 2% biuret, foliar application 8. 1.15 g/N pot + 3% biuret, foliar application The amount of urea applied was 2,5 g/pot The results showed that both soil and foliar biuret applications did not affect the plant development, which was evaluated by plant height and leaves and stem dry matter.O presente trabalho foi realizado no Departamento de Solos, Geologia e Fertilizantes da Escola Superior de Agricultura "Luiz de Queiroz", USP , com a finalidade de estudar os efeitos fitotóxicos do biureto adicionado à uréia, aplicado no solo ou via foliar, em sorgo sacarino (Sorghum bicolor L.) (Moench). Foram usados dois tipos de solos: um arenoso-Areia Quartzosa e um argiloso-Terra Roxa. Os tratamentos foram: 1. 1,15 g N/vaso no solo 2. 1,15 g N/vaso + 1% de biureto no solo. 3. 1,15 g N/vaso + 2% de biureto no solo. 4. 1,15 g N/vaso + 3% de biureto no solo. 5. 1,15 g N/vaso, via foliar. 6. 1,15 g N/vaso + 1% de biureto via foliar. 7. 1,15 g N/vaso + 2% de biureto via foliar. 8. 1,15 g N/vaso + 3% de biureto via foliar. A quantidade de uréia aplicada foi de 2,5 g/vaso. Os resultados obtidos indicaram que o biureto aplicado no solo ou nas folhas não afetou o desenvolvimento das plantas avaliado pela altura e massa de matéria seca de folhas e de caules