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| Merlin,Alexandre; He,Zhenli Li; Rosolem,Ciro Antonio. |
| The objective of this work was to evaluate the effectiveness of ruzigrass (Urochloaruziziensis) in enhancing soil-P availability in areas fertilized with soluble or reactive rock phosphates. The area had been cropped for five years under no-till, in a system involving soybean, triticale/black-oat, and pearl millet. Previously to the five-year cultivation period, corrective phosphorus fertilization was applied once on soil surface, at 0.0 and 80 kg ha-1 P2O5, as triple superphosphate or Arad rock phosphate. After this five-year period, plots received the same corrective P fertilization as before and ruzigrass was introduced to the cropping system in the stead of the other cover crops. Soil samples were taken (0-10 cm) after ruzigrass cultivation and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria ruziziensis; Urochloa ruziziensis; Cover crops; Crop rotation; P cycling; Phosphorus fractionation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001200007 |
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| Pavinato,Paulo Sergio; Merlin,Alexandre; Rosolem,Ciro Antonio. |
| The objective of this work was to evaluate the effect of organic compounds from plant extracts of six species and phosphate fertilization on soil phosphorus availability. Pots of 30 cm height and 5 cm diameter were filled with Typic Hapludox. Each pot constituted a plot of a completely randomized design, in a 7x2 factorial arrangement, with four replicates. Aqueous extracts of black oat (Avena strigosa), radish (Raphanus sativus), corn (Zea mays), millet (Pennisetum glaucum), soybean (Glycine max), sorghum (Sorghum bicolor), and water, as control, were added in each plot, with or without soluble phosphate fertilization. After seven days of incubation, soil samples were taken from soil layers at various depths, and labile, moderately labile and nonlabile P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Raphanus sativus; Cover crops; Crop rotation; Labile phosphorus; Low-molecular-weight organic acids; Phosphorus fractionation. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001000017 |
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| Pavinato,Paulo Sergio; Merlin,Alexandre; Rosolem,Ciro Antonio. |
| O sistema de manejo normalmente afeta a disponibilidade de nutrientes no solo, em decorrência das práticas de cultivo, da rotação de culturas e dos resíduos remanescentes na área cultivada. O objetivo deste trabalho foi avaliar as alterações na disponibilidade de cátions no perfil do solo sob sistema convencional e semeadura direta, por mais de 10 anos, em dois Latossolos do cerrado brasileiro. Os experimentos foram realizados em Costa Rica, MS, e Luziânia, GO, sendo um Latossolo Vermelho (LV) e um Latossolo Vermelho-Amarelo (LVA), respectivamente, com dois sistemas de cultivo, semeadura direta (SSD) e cultivo convencional (SCC). Os solos foram coletados em tubos de PVC, da superfície até 40 cm de profundidade, e conduzidos para casa de vegetação, no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acidez e manejo do solo; Potássio no solo; Cálcio no solo; Magnésio no solo; Semeadura direta. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000400027 |
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| Toledo,Mariana Zampar; Garcia,Rodrigo Arroyo; Merlin,Alexandre; Fernandes,Dirceu Maximino. |
| Silicon (Si) fertilizers have been increasingly used in agriculture due to several benefits as acidity correction in tropical soils and positive effects on the development of grasses. Nutrient availability and plant nutrition play an important role in seed production and may affect the physiological quality of white oat seeds. The present study had as objective to evaluate seed germination and seedling development of white oat (Avena sativa L.) affected by silicon and phosphorus fertilization. The experimental design was the completely randomized, analyzed as a factorial 2 x 4, with six replications. Treatments consisted of 20 and 200 mg dm-3 of P2O5, applied as triple superphosphate, combined with 0, 150, 300 and 450 mg dm-3 of Si, as potassium silicate.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena sativa L; Germination; Vigor; Plant nutrition. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100003 |
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| Rosolem,Ciro Antonio; Merlin,Alexandre; Bull,Júlio Cesar Longo. |
| Some plant species can change soil phosphorus (P) availability and this may be an important tool in managing tropical high fixing phosphorus soils. An experiment was conducted to evaluate phosphorus transformations in the soil and phosphatase activity during periods of Congo grass (Brachiaria ruziziensis, Germain et Evrard) growth in two tropical soils receiving 20, 40, 80, 160 mg dm-3 of inorganic P. Plants were grown for 84 days in 8-L pots. Acid phosphatase activity, P in the microbial mass, soil organic and inorganic P and P accumulation by Congo grass were evaluated. Phosphorus fertilization increased soil P availability, Congo grass yields and P accumulation in the plant. On average, less labile P forms in the soil were not changed by Congo grass;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphatase; Soil fertility; Crop rotation; Brachiaria. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400008 |
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