Fluxo difusivo de micronutrientes catiônicos afetado pelo tipo, dose e época de incorporação de adubos verdes ao solo

Pegoraro, Rodinei Facco; Silva, Ivo Ribeiro; Novais, Roberto Ferreira; Mendonça, Eduardo de Sá; V., Víctor Hugo Álvarez; Nunes, Flancer Novais; Gebrim, Fabrício Oliveira

doi:10.1590/s0100-06832006000600009

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…The cover crops also recycled considerable amounts of Cu, Fe, Mn, and Zn (Table 1). Studies have shown that regular addition of cover crops residues enhances the stability of soluble forms of cationic micronutrients in the soil solution (Pegoraro et al 2006). The cover crops of plants have different nutrient recycling capabilities and, in the case of biological nitrogen fixation (BNF), it depends on the nutrient content in plant tissue and the amount of dry biomass produced, which in turn influences the edaphic conditions, and climate, as well as the handling time (Amabile et al 1999;Perin et al 2004).…”

Section: Characterization Of Ground Cover Speciesmentioning

confidence: 99%

Biomass and Nutrient Accumulation by Cover Crops and Upland Rice Grown in Succession Under No-Tillage System as Affected by Nitrogen Fertilizer Rate

Silva¹,

Muraoka²,

Bastos³

et al. 2020

J. Crop Sci. Biotechnol.

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Cover plants are intended to cover the soil, protecting it from erosion, nutrient leaching, and providing nutrients through recycling or biological fixation. The objectives of this study were to evaluate the dry biomass productivity and total accumulation of nutrients in the cover crops shoots and in the upland rice grown in succession; and evaluate the effect of the isolated and combined use of cover crops and urea on upland rice crop, grown under no-tillage system. The field experiment was conducted at Selvíria-MS, Brazil, in an Oxisol (Rhodic Haplustox), cerrado (savannah) phase. The experimental design was randomized blocks, in a 5x3 factorial scheme. The treatments were four cover crops species: sunn hemp (Crotalaria juncea L.), pigeon pea (Cajanus cajan L.), green velvet bean (Mucuna prurens), millet (Pennisetum glaucum L.), and spontaneous vegetation (fallow in off-season) combined with 20 kg N ha -1 applied at sowing, 20 kg N ha -1 applied at sowing + 60 kg N ha -1 at plus topdressing, and without mineral N fertilizer application. The millet recycled large amounts of K, Mg, S, and micronutrients, but negatively influenced the rice grain yield grown in succession. There was no response to topdressed mineral N fertilizer when the crop was grown in rotation to legume cover crops. Upland rice under no-tillage showed a positive response to the N fertilization at seeding and when it is grown in rotation with the use of millet or fallow in the off-season. Upland rice also showed a response to N fertilization applied at topdressing.

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Section: Characterization Of Ground Cover Speciesmentioning

confidence: 99%

Biomass and Nutrient Accumulation by Cover Crops and Upland Rice Grown in Succession Under No-Tillage System as Affected by Nitrogen Fertilizer Rate

Silva¹,

Muraoka²,

Bastos³

et al. 2020

J. Crop Sci. Biotechnol.

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“…The deficiency of these nutrients, in addition to the relation with the soil pH, may be related to the lower volume of soil explored by the very young plants at the stage 1. The cationic micronutrients are transported in the soil mainly by diffusive flow (Pegoraro et al 2006). Root growth reduces the transport distance of nutrients and facilitates a greater diffusive flow.…”

Section: Resultsmentioning

confidence: 99%

Foliar indices for carrot crop using the compositional nutrient diagnosis method1

Silva

Oliveira

et al. 2017

Pesqui. Agropecu. Trop.

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Carrot has a high yield potential, which requires an adequate and adaptable nutritional management, according to the needs and demands of each crop. Foliar diagnosis is a tool for adjustment and constant improvement of crop fertilization programs. This study aimed to determine leaf indices and reference values using the compositional nutrient diagnosis (CND) method, at three phenological stages of carrot crops [40 and 70 days after sowing (DAS) and at harvest]. In order to calculate the CND method, a database was created with leaf contents of the nutrients N, P, K, Ca, Mg, S, B, Cu, Mn and Zn and root yields, in commercial carrot crops. The nutrient limitation order was generated according to the fertilization response potential. At 70 DAS and at harvest, Mg and Mn were the most limiting nutrients by deficiency, while Zn was the most limiting by excess at 70 DAS, and P and Ca were the most limiting by excess at harvest. The results indicate that the foliar diagnosis performed with the CND method is only effective for the correction of nutritional disturbances in subsequent crops.

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“…Areas with a less dense vegetation cover have a greater loss of soil, nutrients and organic matter (Lobato, Andrade, Meireles, Santos, & Lopes, 2009), all of which are essential to plant growth and development (Meurer, 2007). We emphasize that organic matter is a primary factor in the maintenance of the productive capacity of the soil (Silva & Mendonça, 2007) since it provides nutrients (Costa, Beltrão, Silva, Melo Filho, & Silva, 2010), retains cations (Ciotta, Bayer, Fontoura, Ernani, & Albuquerque, 2003), complex toxic elements and micronutrients (Pavinato & Rosolem, 2008;Pegoraro et al, 2006), stabilizes aggregates (Salton et al, 2008) and enhances aeration (Souza & Alves, 2003), infiltration, water retention (Sato, Figueiredo, Leão, Ramos, & Kato, 2012) and microbial activity (Capuani, Rigon, Beltrão, & Brito Neto, 2012).…”

Section: Desertification Degree Index (Ddi) In Test Areasmentioning

confidence: 99%

Monitoring desertification in semiarid Brazil: Using the Desertification Degree Index (DDI)

et al. 2020

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Desertification is a phenomenon that takes place in the arid, semiarid and dry subhumid areas of the Planet. Although its causes and consequences are well known, data and robust information are often insufficient to provide indicators that allow desertification effects to be measured precisely and efficiently. Accordingly, the objective of this study was to introduce a methodology for the drafting of a monitoring index for desertification, with indicators of vegetal coverage, taking the semiarid area of Paraiba State, Brazil, as the test example. For this purpose, we analyzed conserved and desertified areas (22 pairs), in which we evaluated the following parameters: woody species richness, woody plant density, canopy height, mean basal circumference, mean circumference at breast height and total absolute dominance. First, we selected the indicators, calculated the areas of coverage and measured the reference values. Subsequently, we obtained masses for the indicators, and developed and tested the desertification degree index (DDI). The DDI showed 99% accuracy and 95% efficiency, respectively, and was able to select indicators and evaluate the level of desertification in the test areas. The methodology is simple, inexpensive and replicable in other regions of the world as a means of monitoring and planning strategies to counter desertification.

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Fluxo difusivo de micronutrientes catiônicos afetado pelo tipo, dose e época de incorporação de adubos verdes ao solo

Abstract: RESUMO(1) Recebido para publicação em março de 2005 e aprovado em novembro de 2006.

Cited by 7 publications

References 26 publications

Biomass and Nutrient Accumulation by Cover Crops and Upland Rice Grown in Succession Under No-Tillage System as Affected by Nitrogen Fertilizer Rate

Biomass and Nutrient Accumulation by Cover Crops and Upland Rice Grown in Succession Under No-Tillage System as Affected by Nitrogen Fertilizer Rate

Foliar indices for carrot crop using the compositional nutrient diagnosis method1

Monitoring desertification in semiarid Brazil: Using the Desertification Degree Index (DDI)

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