|
|
|
|
|
| Veronese,Marcio; Francisco,Eros Artur Bohac; Zancanaro,Leandro; Rosolem,Ciro Antonio. |
| O objetivo deste trabalho foi avaliar o efeito de plantas de cobertura e da calagem sobre a produtividade da soja e as características químicas do perfil do solo, após implantação do plantio direto. O experimento foi realizado em campo por dois anos, em Latossolo Vermelho‑Amarelo. A área era explorada como pastagem há cinco anos. Avaliaram-se três sistemas de cultivo: soja/pousio/soja, soja/Pennisetum glaucum/soja e soja/Urochloa ruziziensis/soja, com aplicação de calcário à dosagem de 0, 0,5, 1,0 e 2,0 vezes a quantidade necessária para elevar a saturação de bases (V) a 50%, na camada de 0-20 cm. O calcário foi incorporado ao solo, a 20 cm de profundidade, previamente à implantação dos sistemas de cultivo. Aos 490 dias após a calagem, foram coletadas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pennisetum glaucum; Brachiaria ruziziensis; Acidez do solo; Correção subsuperficial; Sistema de produção. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000800017 |
| |
|
|
| Kappes,Claudinei; Zancanaro,Leandro; Francisco,Eros Artur Bohac. |
| ABSTRACT Information on fertilizer management for cotton in narrow-row cropping system is scarce; therefore, studies are needed to improve nutrient stewardship for such systems. The aim of this study was to evaluate the effects of nitrogen and potassium application on yield and fiber quality of cotton under a narrow-row system. A field trial was carried out for three years, where the treatments were set up in an incomplete factorial arrangement [(4 × 4) + 1] under a randomized block design, with four N rates (20, 40, 60, and 80 kg ha-1), four K2O rates (0, 40, 80, and 120 kg ha-1), and one control (no N or K2O), for a total of 17 treatments, with four replicates. Urea and potassium chloride were applied on the soil surface 20 days after crop emergence.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Nitrogen; Potassium; Narrow-row cotton. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100512 |
| |
|
|
| Duarte,Aildson Pereira; Abreu,Mônica Ferreira de; Francisco,Eros Artur Bohac; Gitti,Douglas de Castilho; Barth,Gabriel; Kappes,Claudinei. |
| ABSTRACT: Unchanged reference values of grain nutrient contents for corn have been used for over 20 years, despite yield increases, the development of new hybrids, and modifications to cropping systems, especially the establishment of in-season second crops and the wide adoption of no-tillage. This study measured macro- and micronutrient contents in corn grains from different regions, in the first (summer) and second (fall) crop, to update the reference values of estimated nutrient removal. A secondary objective was to determine whether there were correlations between grain nutrient contents and grain yields and densities. In this study, 175 corn grain samples of experiments on cultivar evaluation and 22 samples from soil management trials from five states... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Corn grains; Mineral nutrient contents; Grain yield; Grain density. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100517 |
| |
|
| |
|
|
| Francisco,Eros Artur Bohac; Prochnow,Luís Ignácio; Toledo,Maria Cristina Motta de; Ferrari,Viviane Carillo; Jesus,Sérgio Luís de. |
| Optimization in the use of phosphate rocks is important and the residues of fertilizer production in the form of crandallite may be suitable for agronomic use after calcination. With the objective of evaluating the effect of thermal treatment of the aluminous phosphates of the crandallite group as related to solubility, crystalline structure and morphology, samples from the mine residues of three Brazilian phosphate deposits (Tapira-MG, Catalão-GO, and Juquiá-SP) were collected, air-dried, and screened to 100 mesh. Sub samples were thermally treated at 300, 500, 700, and 900°C for 2 hours. Treated and untreated materials were analyzed by X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and for the total and soluble P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcination; Phosphate fertilizer; Phosphate impurities. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300009 |
| |
|
| |
|
|
|
