RICE SEED TREATMENT AND RECOATING WITH POLYMERS: PHYSIOLOGICAL QUALITY AND RETENTION OF CHEMICAL PRODUCTS

Lovane Klein Fagundes,Ubirajara Russi Nunes,Nathália Saibt,Eduardo José Ludwig,Tiéle Stuker Fernandes,Osmar Damian Prestes

doi:10.1590/1983-21252017v30n412rc

Lovane Klein Fagundes, Ubirajara Russi Nunes + Show 4 more

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https://doi.org/10.1590/1983-21252017v30n412rc

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Journal: Revista Caatinga	Publication Date: Dec 1, 2017
Citations: 6	License type: cc-by

Affiliation: Universidade Federal de Santa Maria

Abstract

ABSTRACT The use of chemical seed treatment is an important tool in the protection of seedlings and has contributed to the increase of rice yield (Oryza sativa L.). The objective of this study was to evaluate the physiological quality and quantify the retention of chemical products in rice seeds treated with insecticide and fungicide coated with polymers. Six seed treatments were used: control, phytosanitary treatment and phytosanitary treatment and coating with the polymers, Florite 1127®, GV5® Solid Resin, Polyseed CF® and VermDynaseed®. The physiological quality was evaluated by the test of germination and vigor by first count tests, germination speed index, shoot length, radicle length, seedling dry mass and sand emergence. To determine the retention of the active ingredients metalaxyl-M and thiamethoxam, an equipment called extractor was used. The experiment was organized in a completely randomized design (DIC) and the averages were separated by the Scott Knott test (p≤0.05). Seed treatment with the fungicide and insecticide, coated with the polymers, Florite 1127®, Solid Resin GV5®, Polyseed CF® and VermDynaseed®, did not affect the physiological quality of rice seeds. Solid Resin GV5®, Polyseed CF® and VermDynaseed® polymers were efficient at retaining thiamethoxam in the rice seeds, preventing some of the active ingredients of the insecticide from being leached through the sand columns immediately after the simulated pluvial precipitation.

Highlights

The irrigated rice crop is concentrated in the southern states of Brazil, and Rio Grande do Sul and accounts for almost 70% of the national production
Thiamethoxam, which is the active ingredient of insecticides of the neonicotinoids group, has low sorption in the soil and high solubility in water, characteristics that facilitate its leaching (BANERJEE et al, 2008)
This study was conducted at the Laboratory of Seed Research (LDPS), and at the Laboratory of Analysis of Residues and Pesticides (LARP) belonging to the Federal University of Santa Maria (UFSM)

Summary

Introduction

The irrigated rice crop is concentrated in the southern states of Brazil, and Rio Grande do Sul and accounts for almost 70% of the national production. There has been an evolution in the chemical industry, with the introduction of fungicides and systemic-acting insecticides since the 1990s This has contributed to improved rice yields, and the indiscriminate use of chemicals can cause resistance to organisms, target non-target organisms and contaminate the water table (SHARMA et al, 2015). The loss of chemicals to the environment occur in a variety of ways, including the leaching process, which refers to the potential by which chemical compounds travel through the soil profile via rainwater or irrigation (CASTRO et al, 2008). This process is dependent on the physico-chemical properties of the soil and products, environmental conditions, soil management practices and the product application (MILHOME et al, 2009). Thiamethoxam, which is the active ingredient of insecticides of the neonicotinoids group (used in the treatment of rice seeds), has low sorption in the soil and high solubility in water, characteristics that facilitate its leaching (BANERJEE et al, 2008)

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