Influence of the humidity and temperature in the imazaquim and diclosulam persistence

• Grant number: 10/16272-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2011
• End date: December 31, 2011
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Patrícia Andrea Monquero
• Grantee: William Sanches Munhoz
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

In soil, studies show that pesticides can undergo different processes of redistribution and degradation, such as adsorption to soil colloids, leaching, runoff, evaporation and biotic or abiotic degradation. Because of this, our objective will be to evaluate the influence of soil moisture and air temperature on the persistence of the herbicides imazaquin and diclosulam in a Rhodic Distroferric - loamy texture. In vases filled out with soil samples, will be appraised the persistence of the imazaquim (0,15 kg i.a ha-1) and diclosulam (0,035 kg i.a. ha-1) applied in pré-emergency in enviromment composed by the combination of the 17 and 24 ºC with four humidity levels (0, 40, 60 and 80% of the capacity of retention of water) and seven evaluation periods (0, 15, 30, 45, 60, 75 and 90 days after the application of the treatments), using as bioindicator corn, in the case of the imazaquim and sunflower in the case of diclosulam. The visual evaluation of phytoxicity will be made to the 7, 14, 21 and 28 days after emergency, and to the 28 days the leaf area and biomass dries will be determined.