Effect of planting system and nicosulfuron doses on soil microbial activity

Planta Daninha

Universidade Federal do Tocantins¹  Universidade Estadual Paulista Júlio de Mesquita Filho¹  Santos, J.B¹  Universidade Federal de Viçosa, Viçosa¹  Camelo, G.N¹  UFVJM¹  Pereira, G.A.M¹  Instituto Nacional de Pesquisas da Amazônia¹  Lazari, T.M¹  Santos, E.A¹  Ferreira, E.A¹  Oliveira, T.A¹ 

关键词: microbial biomass;    respirometry;    metabolic quotient.;   

DOI  :  10.1590/S0100-83582011000400013

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 】

This study aimed to evaluate the effect of atrazine + nicosulfuron on soil microbial activity, under the conventional and no-tillage systems. The experiment was carried out in an area of maize-brachiaria intercropping, where atrazine + nicosulfuron were applied at (1,500 + 10 and 1,500 + 30 g h-1) with a weed-handed area being maintained without prior cultivation and another area without weed control. At flowering, soil samples were collected to determine the rate of CO2 unfastening, microbial biomass carbon (MBC) and metabolic quotient (qCO2) using the relation between accumulated CO2 and MBC. The rate of CO2 unfastening was lower only in plots without weed control. MBC was higher in the no-tillage system, being negatively affected due to the absence of vegetation. Lower MBC was observed in the weed-handed areas, probably due to the absence of straw. Under no-tillage system conditions, no difference was observed between the soil treatments with herbicide application and those without weed control. It can be concluded that the evaluated microbiological indicators were sensitive to the treatments, showing lower soil disturbance under no-tillage system conditions. However, in crop-livestock integration under the conventional system, the negative herbicide effect increase of nicosulfuron rate.

【 授权许可】

Unknown