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| Berghetti,Juliano; Casa,Ricardo Trezzi; Ferreira,Evandro Zacca; Zanella,Eduardo José; Scheidt,Bruno Tabarelli; Sangoi,Luis. |
| ABSTRACT Stalk rots compromise the translocation of water and nutrients, affecting grain filling. This study aimed to quantify the incidence of stalk rots in corn hybrids depending on sowing time and nitrogen topdressing rate, and to assess any correlation with grain yield. The experiment was conducted under field conditions in Atalanta, Santa Catarina state, Brazil, using a split-split-plot randomized block design. The hybrids AG 9025 PRO3 (super-early) and 30F53 VYH (early) were sown in the preferential (September 20) and late (December 5) sowing seasons with four nitrogen rates (0, 150, 300, and 450 kg·ha–1). The population density was 75,000 plants·ha–1 andthe nitrogen topdressing was carried out at the V4, V8, and V12 stages. The fungus Colletotrichum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Colletotrichum graminicola; Nitrogen fertilization; Stalk diseases. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300371 |
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| Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Berghetti,Juliano; Kuss,Cassiano Carlos; Santi,Antônio Luis; Basso,Claudir José. |
| ABSTRACT Euschistus heros is one the most important pest insect in soybean fields in Brazil. Therefore, site-specific management applied for controlling E. heros can result in economic and environmental benefits. However, sampling protocols for assessing spatialtemporal variability of this soybean pest and, then, for guiding a more sustainable pest management, were still unknown. Thus, the objective of this study was to compare the efficiency of sampling grid sizes for monitoring the spatial variability of E. heros infestation along the soybean reproductive stages. Nine sampling campaigns were carried out using the beating sheet method, from R2 to R7 soybean phenological stages. It was used a sampling grid of 10 × 10 m, totaling 338 points in an soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical brown stink bug; Pest sampling protocol; Spatio-temporal variability; Precision agriculture. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300386 |
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| Scheidt,Bruno Tabarelli; Garcia,Jaquelini; Casa,Ricardo Trezzi; Coelho,Cileide Maria Medeiros; Bogo,Amauri; Berghetti,Juliano. |
| ABSTRACT: The fungus Microdochium albescens is one of the main pathogens associated with irrigated rice seeds in southern Brazil. The objective of the present study was to quantify the transmission of M. albescens from naturally infected seeds to the crown, coleoptile, and first true leaf of the seedlings of six cultivars growing in pre-germinated cultivation system of irrigated rice. Seeding was carried out on a water-saturated substrate, using four untreated seed lots for each of the six cultivars. At 14 days after sowing, the crown, coleoptile, and first true leaf of the seedlings were carefully highlighted, and the samples were disinfected and plated onto potato-sucrose-agar culture medium. M. albescens was transmitted asymptomatically to crown,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Gerlachia oryzae; Infected seed; Transmission rate. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000200151 |
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| Cherubin,Maurício Roberto; Santi,Antônio Luis; Eitelwein,Mateus Tonini; Menegol,Diego Ricardo; Ros,Clóvis Orlando Da; Pias,Osmar Henrique de Castro; Berghetti,Juliano. |
| O objetivo do trabalho foi estudar a eficiência das malhas amostrais, utilizadas nas áreas manejadas com agricultura de precisão, para a caracterização da variabilidade espacial dos teores de fósforo (P) e potássio (K). O estudo foi conduzido em 30 áreas agrícolas, localizadas no Rio Grande do Sul, cujos solos foram classificados como Latossolos Vermelhos. As dimensões das malhas amostrais estudadas foram: 100x100m (10 áreas), 142x142m (10 áreas) e 173x173m (10 áreas). Foram analisados os teores de P e K na profundidade de 0,00-0,10m. Os dados foram submetidos à análise estatística descritiva e a análise geoestatística. De modo geral, as áreas estudadas apresentaram teores médios de P e K adequados ao desenvolvimento das culturas. Entretanto, observaram-se... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultura de precisão; Amostragem de solo; Fertilidade do solo; Geoestatística; Latossolos. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000300007 |
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