Imazapyr sorption in soils with different textures

Planta Daninha

Firmino, L.E.¹  Universidade Federal de Viçosa, Viçosa¹  Ferreira, L.R.¹  Ferreira, F.A.¹  Tiburcio, R.A.S.¹  Tuffi Santos, L.D.¹ 

关键词: leaching potential;    bioassay;    herbicide.;   

DOI  :  10.1590/S0100-83582008000200016

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

Knowledge about herbicide behavior in the environment, especially in soil, allows predicting possible impacts caused by its use in agricultural systems. An experiment using Sorghum bicolor as a bio-indicator was carried out to evaluate imazapyr sorption in soil. Sorption was evaluated in washed sand and in soils of 3 different textures: very clayed, sandy clayed loam and sandy loam, respectively from Sete Lagoas, João Pinheiro and Rio Casca - Minas Gerais. The value of I50, which inhibits 50% of dry biomass accumulation of the test-plant, and sorption relation (SR = I50 soil - I50 sand/I50 sand) were determined. I50 values observed were 29.41, 10.20 and 7.33 mg kg-1 and SR values were 9.77, 2.73 and 1.68, respectively for very clayed, sandy clayed loam and sandy loam soils. The order of substrate sorption presented by imazapyr was very clayed > sandy clay loam > sandy loam > washed sand. In sandy soil and soil with low organic matter content, low imazapyr sorption predisposes the product to leaching, and it may contaminate the underground water.

【 授权许可】

Unknown