Behavior of RR soybeans in different production environments, subjected to different managements, formulations and rates of glyphosate

Author(s)

Alfredo Junior Paiola Albrecht

• Document type: Master's Dissertation
• Press: Piracicaba.
• Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
• Defense date: 2014-02-03

Examining board members

Ricardo Victoria Filho; José Laercio Favarin; Rubem Silverio de Oliveira Junior

• Advisor: Ricardo Victoria Filho

Abstract

The benefits of the Roundup Ready technology are expressive and the acceptance of this technology by farmers is undeniable, giving support to the rapid growth of RR soybean crops. Recent studies indicate, however, that glyphosate applied in post-emergence in RR soybean can eventually cause phytotoxic effects, as well as influence the plant nutritional balance, affecting photosynthesis, the rhizosphere, biomass accumulation, amino acid synthesis and secondary compounds, water use efficiency, and the quality of seeds produced. Therefore, there are many speculations and questions that need to be clarified in the scientific and technical context, involving the issue of RR soybeans regarding the use of glyphosate. Thus, it is necessary the search for information allowing to diagnose the real consequences of its use. This study evaluated the impact of the application of different doses, management procedures and formulations of glyphosate, in RR soybean, in different production environments. For that purposes, were conducted two major experiments, in different harvests, in different locations, and some additional experiments. Were used a factorial design 2X2X5 (formulations X management X doses) totaling 20 treatments. Were evaluated several variables related to the agronomic performance. The results allowed to characterize some problems regarding the glyphosate use in post-emergence in RR soybeans, identifying that high doses are harmful to the plant performance and productivity. The results allow a better understanding and a more secure positioning of this technology, enabling the reduction of possible deleterious effects of glyphosate on RR soybeans. (AU)

• FAPESP's process: 12/10371-3 - BEHAVIOR OF RR SOYBEANS IN DIFFERENT PRODUCTION ENVIRONMENTS, SUBMITTED TO DIFFERENT MANAGEMENTS, FORMULATIONS AND RATES OF GLYPHOSATE
• Grantee: Alfredo Junior Paiola Albrecht
• Support Opportunities: Scholarships in Brazil - Master