Humic fractions of forest, pasture and maize crop soils resulting from microbial activity

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

Condições, modos de aplicação e doses de ureia revestida por polímeros na cultura do milho

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

ASIAN SOYBEAN RUST INTEGRATED MANAGEMENT POTENTIAL: DISEASE SEVERITY, PLANT DEVELOPMENT AND YIELD COMPONENTS, CULTIVAR MG/BR-46 (CONQUISTA)

Soybean rust caused by Phakopsora pachyrhizi Sydow & P. Sydow is one of the major diseases of the soybean crop. The aim of this study was to evaluate the effects of sowing dates, plant populations and reduced doses of fungicides on soybean rust severity and its effects on plant development and yield, cultivar MG/BR46 (Conquista). Field experiments were conducted in the 2009/2010 and 2010/2011 harvests, under natural rust infestation of soybean rust. As from the appearance of the first disease symptoms, also began the fungicide spraying and the disease severity assessments. To understand the nature and extent of the effects of different treatments, a multivariate analysis of factors was applied. For the majority of the agronomic characters and factors, one-third to two-thirds of their variability can be explained by changes in plant populations or by differences in the fungicide treatments, and the remainder, was explained by sowing date variations. The fungicide treatments and sowing dates are determinants in disease severity and its interference on crop productivity. The characters of plant growth are more dependent on plant population variations. Treatments with azoxystrobina + ciproconazol promoted smaller disease severities, reflecting in productivity increase. The plant populations can be reduced up to 160.000 plants ha(-1) without losses in the disease control and the soybean yield. In general, the earliest sowings provided increase in the plant development, although the rust control was less efficient.

POTASSIC FERTILIZATION FOR CRAMBE CROP

There are few studies for the crambe crop (Crambe abyssinica Hochst), and studies that characterize the sufficiency level of K in the soil and leaves are indispensable to support future programs potassium fertilization for this crop of fall/winter. An experiment was carried out to investigate the response of crambe to K soil. The experiment was carried out on a clayey Red Latossol under no-till in Botucatu, S (a) over tildeo Paulo State, Brazil. Treatments consisted of seven K levels in the soil, resulting from the application year (2000 to 2010), the summer crop (soybean), 0, 30, 60, 90, 120, 150 and 180 kg ha(-1) K2O. Before starting the experiment, soil samples were collected at depths of 0-20 cm and soil K contents determined by the resin and Mehlich-1 method. The sufficiency levels of K in soil and leaves were obtained considering the relative yield of 90%. When the levels of soil K extracted by resin and Mehlich-1, are above 88 and 94 mg dm(-3), respectively, equivalent to 26 g kg(-1) K in the leaves, the increase in crop yield of crambe is unlikely. These values should match the sufficiency level of crop and are sufficient to achieve relative grain yield of 90%.

Aplicação de produtos fitossanitários na cultura dos citros utilizando pulverizador envolvente

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Dinâmica do nitrogênio em sistemas de produção sob semeadura direta

Pós-graduação em Agronomia (Agricultura) - FCA

Distribuição espacial de Enneothrips flavens, Moulton 1941 (Thysanoptera: Thripidae), na cultura do amendoim, utilizando geoestatística

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Caracterização molecular de Colletotrichum acutatum e C. gloeosporioides associados a citros, por marcadores ISSR

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Espécies de Bacillus no controle de Meloidogyne incógnita e Meloidogyne javanica in vitro e na cana-de-açúcar

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Padrões de distribuição espacial e temporal em comunidades de ácaros em seringueira (Hevea SPP.) no Brasil

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

Metodologias de pesquisa e avaliação da resistência de genótipos de amendoim a Spodoptera albula (walker, 1857) (Lepidoptera: Noctuidae)

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Metodologias de aplicação de sulfonamida heterocíclica no controle de Meloidogyne javanica e Pratylenchus brachyurus em soja

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Caracterização molecular, citogenética e sensibilidade a herbicidas em três populações de Rottboellia cochinchinensis em cana-de-açúcar no estado de São Paulo

Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV

Inter-relações entre nematoides, fungo e a cultura da seringueira

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Short-term CO2-C emissions from soil prior to sugarcane (Saccharum spp.) replanting in southern Brazil

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