Controle térmico de plantas daninhas na cultura do citros: ensaio preliminar.

Abstract

The research was conducted at orchard of orange of the Campus of UNESP/Jaboticabal, being evaluated the effect of the flame application on the weeds, the microbial activity of the soil and the dynamics of the bank of seeds. The rehearsal was composed by 5 treatments, being: testifies; glyphosate; paraquat; thermal treatment with speed of displacement of 1,41 and 3,75km ha-1. The treatments were applied, sequence, in the street of the orange orchard, in an area of 30m2. The effects of the treatments were appraised to the 07 and 14 days after the application. Of the observed results: the thermal control was shown efficient, mainly the speed of 1,41km ha-1, in comparison with the control chemical; the method is demonstrated to be viable in the months of winter, condition that limits the use of chemical; the microbial activity non susceptive was demonstrated to the action of the temperature; it was verified in a general way that there was increase in the germination of seeds after the thermal treatment, however the emergency of the species Synedrellopsis grisibachii and Type horizontalis it decreased respectively in 50 and 80%.