Desenvolvimento de métodos quantitativos e de sistemas de screening para a determinação de glifosato

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Evolução de CO2 e atividades enzimáticas em amostras de solo tratado com herbicidas

Effects of bentazon, metolachlor, trifluralin, imazethapyr, imazethapyr+lactofen, haloxyfop-methyl, glyphosate and chlorimuron-ethyl at rates of 2 and 10 times the equivalent commercial dose on soil microbial activity was evaluated in soil samples extracted from a field never treated before. Global soil microbe respiration, estimated by CO2 production at 2, 4, 8, 12, 16, 20, 24 and 28 days of soil incubation and enzymatic activities (dehydrogenase and fluorescein diacetate hydrolysis) at 8 and 28 days were used as bioindicators. Bentazon and mixture imazethapyr+lactofen at the highest rate and haloxyfop-methyl at both rates, inhibited soil respiration although with differences in timing and duration. None of the herbicides affected FDA hydrolysis. Dehydrogenase activity was inhibited at 8 days of incubation with bentazon and imazethapyr at high rates but it was stimulated by metolachlor and imazethapyr at low rate and glyphosate at the highest rate. Herbicide effects on soil microbial activity was detected with higher sensitivity by global soil microbe respiration and dehydrogenase activity than by FDA hydrolysis. Only dehydrogenase activity and soil respiration estimations at 8 days of soil incubation had significant correlation. Results indicated the need of multiple estimations when evaluating herbicides effects on soil microbiota

Soil nitrogen dynamics after Brachiaria desiccation

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Action of rain on the efficiency of herbicides applied post-emergence in the control of Senna obtusifolia

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Adubação nitrogenada e aplicação de herbicidas como reguladores de crescimento em grama esmeralda

Pós-graduação em Agronomia - FEIS

Hormesis de herbicidas em soja

Pós-graduação em Agronomia (Agricultura) - FCA

Influência de diferentes misturas em tanque contendo o herbicida 2,4-D no espectro de gotas da aplicação

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Métodos para identificação de moléculas com atividade herbicida com ênfase na rota de síntese de carotenóides

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Distribuição espacial e plano de amostragem sequencial para Piezodorus guildinii (Westwood, 1837) (Hemiptera: Pentatomidae) na cultura de soja transgênica RR®

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Procedures to Evaluate the Efficiency of Protective Clothing Worn by Operators Applying Pesticide

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Nitrogen budget in a soil-plant system after brachiaria grass desiccation

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Efeito de maturadores sobre a germinação e crescimento inicial de corda-de-viola

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Eficiência de herbicidas no controle de plantas daninhas latifoliadas em mamona

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Dessecação em pré-colheita com glifosato e qualidade de sementes armazenadas de soja

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Umedecimento do substrato e temperatura na germinação e vigor de sementes de melão

The study was conducted to evaluate the efficacy of herbicides in desiccation Raphanus raphanistrum (wild radish) in different application times and their effects on weed seed germination. The experimental had a randomized block design with three replications. The herbicides used were: glyphosate (360; 720; and 1080 g ha(-1)), 2,4-D (335; 670; and 1005 g ha(-1)), glyphosate + 2,4-D (360 + 335; 720 + 670; and 1080 + 1005 g ha(-1)). Spraying was conducted at three different times: 1st season (full bloom) - at 62 days after emergence (DAE), 2nd season (beginning of pod formation) - at 92 DAE and 3rd season (end of pod formation) - at 108 DAE. At 14, 21, 28, 35, and 42 days after application (DAA), the desiccation was evaluated visually, and 42 DAA dry mass of shoots and seeds of the 2nd and 3rd times were collected for the test of germination. All chemical treatments tested were effective in controlling the plants of wild radish in the 1st and 2nd times, but in the 3rd time doses of 2,4-D applied singly were not effective and only the highest dose of glyphosate applied singly or in mixture provided a total plant control. In terms of percentage, the reduction in dry matter of plants was higher with the application of larger doses of chemical treatments. The herbicides affected the germination of seeds of wild radish, and the herbicide 2,4-D provided greater reduction in germination in the 2nd and 3rd seasons.