Potencial de mineralização de N e de C em vinte solos de Pernambuco

Alves, Gilson; Sampaio, Everardo V. S. B.; Salcedo, I. H.; Silva, V. M.

doi:10.1590/s0100-06831999000200008

Cited by 10 publications

(6 citation statements)

References 22 publications

(33 reference statements)

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“…The carbon:nitrogen ratios calculated from Table 2 data, were relatively higher in the top layer (C:N ≅ 12) than in the deeper soil horizons (C:N ≤ 10). Alves et al (1999) found values close to these ratios in a study on twenty soils from the Pernambuco State, NE Brazil. Compared to deeper soil horizons, higher C:N ratio in the top layer is due to the influence of above-ground plant residues on soil organic matter characteristics (Diekow et al, 2005).…”

Section: Resultssupporting

confidence: 55%

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil

Bernardi

Machado

Madari

et al. 2007

Sci. agric. (Piracicaba, Braz.)

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Soil organic matter accumulation provides benefits to soil productivity and reduces atmospheric carbon concentration. However, little is known about the accumulation of C and N by sandy soils under perennial irrigated crops in semiarid regions. The objective of this study was to evaluate the effect of irrigated fruit orchard cultivation on the stocks of soil organic carbon (SOC) and total nitrogen (N) of an Arenosol/Quartzpsament from Paraipaba-CE, Semiarid Brazil. Soil samples were taken from irrigated orchards of banana (Musa ssp.), cashew (Anacardium ocidentale), guava (Psidium guajava), bullock's heart (Annona reticulata), mango (Mangifera indica), and sapote (Manilkara zapota) in the wetted-bulb and non-irrigated area between the plant rows. Additional samples were collected from adjacent areas under secondary Caatinga forest, and under a 2-year-old deforested area. Sampling depths were: 0-0.1, 0.1-0.2, and 0.2-0.4 m. The highest contents of SOC and N were found in the surface layer. The soil bulk density did not change in depth. The stocks of SOC and total N under secondary forest at 0-0.40 m layer were 27.6 and 2.4 Mg ha -1 , respectively. Caatinga Forest conversion into fruit orchard cultivation led to a decrease of 5 to 23% and 4 to 21% on SOC and N stocks, respectively. Compared to other soil uses, sapote and bullock's heart contributed for a lower decrease of SOC and N stocks after deforestation. Guava, bullock's heart, mango and sapote contributed for improving the SOC stratification index. Key words: Caatinga forest, soil organic matter, soil stratification index ESTOQUES DE CARBONO E NITROGÊNIO DE UM NEOSSOLO QUARTZARÊNICO SOB CULTIVO DE FRUTEIRAS IRRIGADAS NA REGIÃO DO SEMI-ÁRIDO DO BRASILRESUMO: O acúmulo de matéria orgânica beneficia a produtividade do solo e reduz a concentração do carbono atmosférico. Entretanto, pouco é sabido a respeito do acúmulo de C e N em solos arenosos cultivados com culturas perenes irrigadas em regiões semi-áridas. O objetivo deste trabalho foi avaliar o efeito do cultivo de fruteiras irrigadas nos estoques de C e N de um Neossolo Quartzarênico em Paraipaba, CE. Foram coletadas amostras na linha e na entrelinha de pomares irrigados de banana, caju, manga, sapoti, goiaba e graviola. Em áreas adjacentes sob vegetação de Caatinga hipoxerófila e após dois anos de desmatamento foram coletadas amostras adicionais. As profundidades de amostragem foram: 0 a 0.1, 0.1 a 0.2 e 0.2 a 0.4 m. Os teores de C e N no solo foram mais altos na camada superficial (0 a 0.1 m). Não houve efeito da profundidade de amostragem sobre a densidade do solo. Os estoques de C e N na área com vegetação de Caatinga na camada de 0 a 0.4 m foram de 27,6 and 2,4 Mg ha -1 , respectivamente. A retirada da vegetação natural e o cultivo das fruteiras levaram a reduções de 5 a 23% e 4 a 21% nos estoques de C e N do solo, respectivamente. As culturas do sapoti e da graviola contribuíram para o aumento dos estoques de C e N após a retirada da vegetação natural. As culturas da goiaba, graviola, manga ...

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Section: Resultssupporting

confidence: 55%

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil

Bernardi

Machado

Madari

et al. 2007

Sci. agric. (Piracicaba, Braz.)

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“…Lower values of N 0 , 14.7 to 24.4 mg kg -1 (average 19.5 mg kg -1 ) were observed in the 40-60 cm layer. The N mineralization potential typically decreases with increasing soil depth (Campbell et al, 1981;Salcedo et al, 1985;Alves et al, 1999) because deeper layers of soils have a lower organic matter content and lability.…”

Section: Resultsmentioning

confidence: 99%

Incubation methods for assessing mineralizable nitrogen in soils under sugarcane

Mariano

Leite

Megda

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYConsidering nitrogen mineralization (N) of soil organic matter is a key aspect for the efficient management of N fertilizers in agricultural systems. Long-term aerobic incubation is the standard technique for calibrating the chemical extraction methods used to estimate the potentially mineralizable N in soil. However, the technique is laborious, expensive and time-consuming. In this context, the aims of this study were to determine the amount of soil mineralizable N in the 0-60 cm layer and to evaluate the use of short-term anaerobic incubation instead of longterm aerobic incubation for the estimation of net N mineralization rates in soils under sugarcane. Five soils from areas without previous N fertilization were used in the layers 0-20, 20-40 and 40-60 cm. Soil samples were aerobically incubated at 35 °C for 32 weeks or anaerobically incubated (waterlogged) at 40 °C for seven days to determine the net soil N mineralization. The sand, silt and clay contents were highly correlated with the indexes used for predicting mineralizable N. The 0-40 cm layer was the best sampling depth for the estimation of soil mineralizable N, while in the 40-60 cm layer net N mineralization was low in both incubation procedures. Anaerobic incubation provided reliable estimates of mineralizable N in the soil that correlated well with the indexes obtained using aerobic incubation. The inclusion of the pre-existing NH 4 + -N content improved the reliability of the estimate of mineralizable N obtained using anaerobic incubation.Index terms: Saccharum spp., net N mineralization, aerobic incubation, anaerobic incubation.(

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“…O maior NPM foi observado na camada de 0-0,05 m, decrescendo com o aumento da profundidade, concordando com o encontrado por Salcedo et al (1985) e Alves et al (1999), que também verificaram redução do NPM das camadas superficiais para as mais profundas. Em todos os tratamentos, observaram-se diferenças significativas entre as camadas de 0-0,05 e 5-10, 0-0,05 e 0,10-0,20 m, mas não entre as duas mais profundas, exceto para o tratamento C-Mi-P, onde a diferença foi significativa apenas entre as camadas 0-0,05 e 0,10-0,20 m. O revolvimento do solo, por provocar a mistura mais íntima do solo com os restos culturais, principalmente na camada de 0-0,10 m, decorrente de operações de gradagem, causa aceleração na decomposição do material orgânico, fato que explicaria os resultados obtidos no tratamento CMi-P.…”

Section: Quadro 4 Teores Médios De N Total Nas Matérias Húmicas (N-munclassified

Teores de nitrogênio no solo e nas frações da matéria orgânica sob diferentes sistemas de produção de milho

Souza¹,

Melo

2000

Rev. Bras. Ciênc. Solo

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RESUMOCom o objetivo de avaliar o efeito de sistemas de produção sobre a dinâmica do N no solo e nas frações da matéria orgânica, realizou-se, por seis anos, em Jaboticabal (SP), um experimento constituído de: semeadura convencional de milho com pousio no inverno (C-Mi-P), plantio direto de milho e pousio no inverno (D-Mi-P), plantio convencional de milho em rotação com soja e pousio no inverno (C-Mi-P-So), plantio direto de milho em rotação com soja e pousio no inverno (D-Mi-P-So) e plantio direto de milho com uso de Mucuna aterrina (mucunapreta), Cajanus cajan (

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Potencial de mineralização de N e de C em vinte solos de Pernambuco

Abstract: RESUMO

Cited by 10 publications

References 22 publications

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil

Incubation methods for assessing mineralizable nitrogen in soils under sugarcane

Teores de nitrogênio no solo e nas frações da matéria orgânica sob diferentes sistemas de produção de milho

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