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Pitta R.M.,Embrapa Agrossilvipastoril | Wruck F.J.,Embrapa Arroz e Feijao
Neotropical Entomology | Year: 2014

We report Paricá as the first host recorded for Mysaromima liquescens Meyrick, and the damaging potential of M. liquescens larvae as borers in Nova Canaã do Norte, state of Mato Grosso, Brazil. © 2014 Sociedade Entomológica do Brasil. Source

dos Santos H.P.,Embrapa Trigo | Fontaneli R.S.,Embrapa Trigo | Caierao E.,Embrapa Trigo | Spera S.T.,Embrapa Agrossilvipastoril | Vargas L.,Embrapa Trigo
Pesquisa Agropecuaria Brasileira | Year: 2011

The objective of this work was to assess yield and yield components of wheat cultivated for grain production and for dual-purpose under no-tillage crop-livestock integration systems (CLIS). Grain yield of the two wheat types and yield components for the grain type were evaluated in the 2003 to 2008 growing seasons, in a Rhodic Hapludox, in Coxilha, RS, Brazil, in the following systems: 1, wheat/soybean and common vetch/corn; 2, wheat/soybean and black oat pasture/corn; 3, wheat/soybean and black oat pasture/soybean; 4, wheat/soybean and field pea/corn; 5, wheat/soybean, dual-purpose triticale/soybean, and common vetch/soybean; and 6, wheat/soybean, dual-purpose white oat/soybean, and dual-purpose wheat/soybean. A randomized complete block design, with four replicates, was used. There were no differences between CLIS in yield components (number of spikes, number of grains per spike, and grain mass) of wheat for grain production in differentes CLIS. The systems 2, 3, 4, and 5 showed higher yield of the grain-type wheat in comparison to 6. There are no significant differences in grain yield, hectoliter weight, and weight of 1,000 kernels between wheat cultivated for grain production and for dual-purpose. Source

Zorzeto T.Q.,University of Campinas | Fernandes Junior F.,Embrapa Agrossilvipastoril | Dechen S.C.F.,Instituto Agronomico
Bragantia | Year: 2016

The strawberry, when grown in soil, becomes susceptible to fungi present on it. Rotations of planted areas are essential to control disease, reality unworkable for some Brazilian farmers who have small areas for cultivation. This problem encouraged the use of substrates, a technical pattern already well-established in Europe. The objective was to assess the response of strawberry growth (‘Oso Grande’) on three substrates (granulated coconut fiber, pure rice husk and a mixture of both in equal proportions), volumes (1.0; 1.5 and 2.0 L) and irrigation frequencies (twice, three and four times a day). The experiment was carried out in a greenhouse in Jundiaí (SP), from July 2 to October 4, 2010. The data were submitted to the joint analysis of experiments, in a triple factorial scheme (irrigation frequencies, substrate types and substrate volumes). The best result obtained occurred for substrate mixture, with the irrigation frequency of three times a day, in 1.0 L of the material, with an average yield of 223 g per plant. Rice husk is ineffective for cultivation in pots. Nevertheless, in the form of mixtures, this substrate is suited for cultivation, allowing better results when compared to granulated coconut fiber. © 2016, Instituto Agronomico. All rights reserved. Source

Paulino J.,University of Sao Paulo | Zolin C.A.,Embrapa Agrossilvipastoril | Bertonha A.,State University of Maringa | Freitas P.S.L.,State University of Maringa | Folegatti M.V.,University of Sao Paulo
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2011

This work was conducted in the Cidade Gaúcha PR, with the objective to evaluate the mechanical resistance of soil, the levels of calcium, magnesium, potassium, base saturation in the soil, the roots distribution and yield of sugarcane fertigated with wastewater (stillage) of sugarcane industry for 1, 2, 3, 4, 12 and 20 consecutive years and a control without application. The soil compaction was evaluated with penetrometer cone to 0.50 m depth in intervals of 0.02 m. The results of chemical analysis of soil samples collected between the depths of 0 to 0.20 and 0.20 to 0.40 m were evaluated. The root density was evaluated with the weight of the dry matter of roots with the monolith method retreats to each 0.10 m depths to 0.50 m. The high soil mechanical resistance occurred where wastewater of sugarcane industry was applied for 20 years. The concentration of calcium decreased after two years of application of wastewater, accompanying the fertility of the soils not showing direct connection with the productivity as well as the magnesium. The concentration of the potassium in soil presented linear relation with the productivity. The roots of the sugarcane presented a direct relation with the application time of wastewater of sugarcane industry. Source

This study was carried out to characterize species composition and phytosociology of a native forest located at Caracaraí, Roraima, Brazil. All trees with breast diameter (DBH) above 10 cm in nine 1-ha-permanent plots (100 x 100 m each) were inventoried. We observed 4,724 individuals (525 trees per hectare) distributed in 42 families, 111 genera and 165 species. The families with greater number of individuals were Fabaceae (1883), Lecythidaceae (609) and Sapotaceae (434), comprising 52% of the total. The higher densities of individuals were observed in the pioneer (219 trees ha-1), followed by secondary (193 trees ha-1) and climax species (113 trees ha-1). However, species of secondary group had the highest species richness (95), followed by the climax (44) and the pioneer (26). The Shannon diversity index (H' = 3.27) and the value of Pielou equability (J = 0.64) were lower than those obtained in other floristic inventories in the Amazon, because of the high occurrence of Pentaclethra macroloba. The importance values (VI) were higher for Pentaclethra macroloba (52.1), Eschweilera bracteosa (23.7) and Pouteria caimito (8.1). The importance values of these three species alone accounted for 28% of the total VI across species. Most of the individuals (71.3% = 374 trees ha-1) were recorded in the middle stratum (12.4 m < height < 26.5 m) of forest. The forest community can be considered well-structured, mature and diverse, and so it is in good state of conservation. Source

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