Frações de fósforo em Latossolos

Silva, Meire Adélia da; Nóbrega, Júlio César Azevedo; Curi, Nilton; Siqueira, José Oswaldo; Marques, João José; Motta, P. E. F. da

doi:10.1590/s0100-204x2003001000009

Cited by 21 publications

(11 citation statements)

References 20 publications

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“…These results demonstrate the efficiency of the forages in providing these nutrients to the soil. Soils with Palisade grass had higher P levels in the labile fractions, increasing the absorption of this nutrient by plants (Silva et al, 2003). The OM in NTS also reduces the contact between soil colloids and the phosphate ion, reducing adsorption reactions, while residue decomposition (Figure 3) releases and redistributes organic, more mobile P forms that are less susceptible to adsorption reactions in the soil (Mesquita Filho and Torrent, 1993).…”

Section: Resultsmentioning

confidence: 99%

Autumn Maize Intercropped with Tropical Forages: Crop Residues, Nutrient Cycling, Subsequent Soybean and Soil Quality

Pereira

Mello

Pariz

et al. 2016

Rev. Bras. Ciênc. Solo

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Autumn maize intercropped with tropical forages can raise the amount of crop residues and improve nutrient cycling, favoring subsequent soybean crop. The objective of this study was to evaluate the effect of forms of implementation of intercropping of irrigated autumn maize with tropical forages on yield, decomposition, nutrient accumulation and release, and on the ratio of lignin/total N of forage residues, yield components, and grain yield of subsequent soybean, and on soil physical and chemical properties, under no-tillage in lowland Cerrado. The experiment was arranged in randomized blocks in a factorial (4 × 3 + 1) design with one control and four replications. The treatments consisted of four forages: Palisade grass, Congo grass, and two Guinea grass cultivars (Tanzânia and Áries); and three methods of sowing intercrops of forageautumn maize: forage sown simultaneously with maize in the sowing furrow, mixed with fertilizer; forage sown by broadcasting on the day of maize sowing; and forage seeds mixed with fertilizer broadcast on maize in growth stage V4; plus a control (maize monoculture). The decomposition and nutrient release rate of the forage residues were evaluated by the litter bag method, 30, 60, 90, and 120 days after desiccation. Sowing the forages in the furrow and by broadcasting raise the total amount of maize residues compared to method V4. Regardless of the forage type and sowing methods, intercropping increases the amount of residues compared to maize monoculture. The forages and sowing methods had no influence on nutrient accumulation in the residues at the time of desiccation and at the lowest lignin/total N ratio in Congo grass residues, and a logarithmic decay was observed. Forage and sowing methods did not influence the macronutrient release rate from crop residues for 120 days after desiccation; the release of N, P, K and Mg is logarithmic and the release of Ca and S exponential. Forage and sowing methods do not influence yield components and grain yield of subsequent soybean. However, intercropping increased grain yield of subsequent soybean compared to soybean after maize monoculture, and preserved the soil chemical and physical properties.

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Section: Resultsmentioning

confidence: 99%

Autumn Maize Intercropped with Tropical Forages: Crop Residues, Nutrient Cycling, Subsequent Soybean and Soil Quality

Pereira

Mello

Pariz

et al. 2016

Rev. Bras. Ciênc. Solo

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“…In pot experiments, plant roots are so densely distributed that nearly all soil in the pots are close to the rhizosphere, where pH is usually lower, and P availability may be higher. This may explain the effect observed by Silva et al (2003).…”

Section: Resultsmentioning

confidence: 65%

“…Gatiboni et al (2007) observed no changes in soil-P fractions as affected by fertilization, whereas Silva et al (2003) observed significant decreases in Fe/Al-P after growing Urochloa sp. in a pot experiment, due to high P uptake by grass.…”

Section: Resultsmentioning

confidence: 86%

Ruzigrass affecting soil-phosphorus availability

Merlin

He²,

Rosolem

2013

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effectiveness of ruzigrass (Urochloa ruziziensis) 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 P 2 O 5 , 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 subjected to soil-P fractionation. Soybean was grown thereafter without P application to seed furrow. Phosphorus availability in plots with ruzigrass was compared to the ones with spontaneous vegetation for two years. Ruzigrass cultivation increased inorganic (resin-extracted) and organic (NaHCO 3 ) soil P, as well as P concentration in soybean leaves, regardless of the P source. However, soybean yield did not increase significantly due to ruzigrass introduction to the cropping system. Soil-P availability did not differ between soluble and reactive P sources. Ruzigrass increases soil-P availability, especially where corrective P fertilization is performed.Index terms: Brachiaria ruziziensis, Urochloa ruziziensis, cover crops, crop rotation, P cycling, phosphorus fractionation. Efeito da braquiária sobre a disponibilidade de fósforo no soloResumo -O objetivo deste trabalho foi avaliar a eficácia da braquiária (Urochloa ruziziensis) em aumentar a disponibilidade de P, em solo de áreas fertilizadas com fosfatos solúveis ou reativos. A área havia sido cultivada em semeadura direta por cinco anos, em sistema de cultivo com soja, triticale/aveia-preta e milheto. Previamente ao período de cinco anos de cultivo, aplicou-se adubação corretiva de P à superfície do solo, com 0,0 ou 80,0 kg ha -1 P 2 O 5 , nas formas de superfosfato triplo ou fosfato Arad. Após esse período de cinco anos, as parcelas receberam a mesma adubação corretiva de antes, e a braquiária foi introduzida no sistema de cultivo no lugar das outras plantas de cobertura. Após o cultivo da braquiária, foram coletadas amostras de solo, na camada 0-10 cm, e submetidas ao fracionamento de P. A soja foi cultivada em seguida, sem adubação fosfatada no sulco de plantio. A disponibilidade de P nas parcelas com a braquiária foi comparada àquelas com vegetação espontânea, por dois anos. O cultivo da braquiária aumentou os teores de P inorgânico (extraído com resina) e orgânico (NaHCO 3 ) no solo, bem como o conteúdo de P nas folhas da soja, independentemente da fonte de P utilizada. No entanto, a produtividade da soja não aumentou significativamente pela introdução da braquiária ao sistema de cultivo. A braquiária aumenta a disponibilidade de P no solo, especialmente nas áreas com adubação fosfatada corre...

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“…It is known that Brachiaria species have a great potential to cycle P in the soil to the point of increasing the recovery rates of this nutrient in syculms in which this grass is part of the succession of crops mainly due to its greater root growth, tolerance to Al, efficient nutrient absorption and increased ability to use P under low availability conditions (Rao, 2001;Silva et al, 2003;Sousa & Lobato, 2003). The low availability of P in Brazilian tropical soils limits the production of forages regardless of the cultivated species (Lima et al, 2007) since phosphorus fertilization increases the production of forages (Benício et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Residue of Phosphorus Sources Broadcast and Applied on Rows in Forages during Off-Season Crops

Barbosa¹,

Rodrigues²,

Trindade³

et al. 2017

JAS

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This study aimed to evaluate the residual effect of phosphorus sources and application techniques in the intercropping of forages during off-season crops. The experimental design was randomized blocks in a 4 × 2 + 1 factorial, being four sources of phosphorus [Bayóvar Reactive Phosphate (BRP), Monoammonium Phosphate (MAP), Simple Superphosphate (SS) and Triple Superphosphate (TS)], two application techniques (broadcasting and on rows) and an additional without phosphorus. The experiment was conducted during the off-season crop. The residual effect of phosphorus fertilization increased the growth and the production of biomass of forage sorghum regarding broadcast SS and TS sources. The lowest P contents in the tissue of plants fertilized with SS and TS may be attributed to the diluting effect, as it achieved the highest production of biomass. The application of TS favored a greater dry matter production in Brachiaria brizantha cv. Piatã. At the depth 0.00-0.05 m, there was a higher P content with the application of BRP. However, the production of biomass was low, a factor that may be related to an overestimation of P bound to Ca by the Mehlich-1 extractor. Under cultivation conditions, broadcast SS and TS had a higher residual effect.

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Frações de fósforo em Latossolos

Cited by 21 publications

References 20 publications

Autumn Maize Intercropped with Tropical Forages: Crop Residues, Nutrient Cycling, Subsequent Soybean and Soil Quality

Autumn Maize Intercropped with Tropical Forages: Crop Residues, Nutrient Cycling, Subsequent Soybean and Soil Quality

Ruzigrass affecting soil-phosphorus availability

Residue of Phosphorus Sources Broadcast and Applied on Rows in Forages during Off-Season Crops

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