Rendimento do milho em diferentes condições físicas de solo e quantidade de resíduo na ausência ou na presença de irrigação

Conte, Osmar; Levien, Renato; Trein, Carlor Ricardo; Debiasi, Henrique; Mazurana, Michael

doi:10.1590/s0103-84782009005000022

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…This can be attributed to greater addition of organic residue from maize (approximately 10 Mg ha -1 shoot and root dry mass) compared to sunflower (approximately 3 Mg ha -1 shoot and root dry mass). Occasionally, this increase in the amount of particulate matter present in the soil surface may contribute to future increase in SOC and NT, and consequently increase soil organic matter (Conte et al, 2009). Therefore, the increase in SOC and NT from 2009/10 to 2010/11, aside from the contribution due to the addition of UWC, could be related to maize cultivated in the 2010/11 season.…”

Section: Resultsmentioning

confidence: 99%

Changes in a Rhodic Hapludox under no-tillage and urban waste compost in the northwest of Rio Grande do Sul, Brazil

Moraes

Silva

Cherubin

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe use of urban waste compost as nutrient source in agriculture has been a subject of investigation in Brazil and elsewhere, although the effects on soil physical and chemical properties and processes are still poorly known. The aim of this study was to evaluate the effect of application of urban waste compost and mineral fertilizer on soil aggregate stability and organic carbon and total nitrogen content of a Rhodic Hapludox under no-tillage in the northwestern region of Rio Grande do Sul, Brazil, in the 2009/2010 and 2010/2011 growing seasons. The experiment was arranged in a 2 × 6 (seasons and fertilization) factorial in a randomized complete block design with four replications. The factor time consisted of two growing seasons (sunflower in 2009/10 and maize in 2010/11) and the factor fertilization of five rates of urban waste compost (0, 25, 50, 75 and 100 m 3 ha -1 ), and mineral fertilizer. Soil samples were collected from the 0.0-0.10 m layer to determine aggregate stability (mean weight and geometric diameter), soil organic carbon (SOC) and total nitrogen (TN). Rates of up to 75 m 3 ha -1 of urban waste compost, after two years of application to no-tillage maize and sunflower, improved aggregation compared to mineral fertilization in a Rhodic Hapludox. After the second crop, the SOC and TN contents increased linearly with the levels of urban waste compost.Index terms: soil organic carbon, aggregate stability, total nitrogen, soil structure, organic manure.( A utilização de composto de lixo urbano como fonte de nutrientes para a agricultura vem sendo investigada; entretanto, as alterações físicas do solo ainda são pouco conhecidas. Objetivouse avaliar a influência do uso de composto de lixo urbano e da adubação mineral na estabilidade de agregados e nos teores de carbono orgânico e nitrogênio total de um Latossolo Vermelho, em sistema plantio direto na região noroeste do Rio Grande do Sul. Utilizou-se o delineamento de blocos ao acaso, em esquema fatorial 6 × 2 (adubação e épocas), com quatro repetições. O fator épocas de avaliação constituiu-se dos anos agrícolas de 2009/10 (girassol) e 2010/11 (milho). O fator adubação foi composto por cinco doses de composto de lixo urbano (0, 25, 50, 75 e 100 m 3 ha -1 ), além de um tratamento adicional com fertilização mineral. Na camada de 0,0-0,10 m, foram determinados a estabilidade de agregados (diâmetro médio geométrico e ponderado), os teores de carbono orgânico (CO) e o nitrogênio total (NT). A utilização de doses crescentes de composto de lixo urbano favoreceu melhorias na agregação do solo, em relação à fertilização mineral. A utilização de até 75 m 3 ha -1 de composto de lixo urbano, após dois anos de aplicações em cultivos agrícolas com milho e girassol em um Latossolo Vermelho, sob sistema plantio direto, promoveu melhorias na agregação do solo, quando comparada à fertilização mineral. O teor de CO e o de NT, após o segundo cultivo, apresentaram incrementos lineares, em relação às doses de composto de lixo urbano.Termos de indexação: carbono orgâ...

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Section: Resultsmentioning

confidence: 99%

Changes in a Rhodic Hapludox under no-tillage and urban waste compost in the northwest of Rio Grande do Sul, Brazil

Moraes

Silva

Cherubin

et al. 2014

Rev. Bras. Ciênc. Solo

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“…These authors observed no significant difference in relation to root dry matter production, regardless of the cultivar or the phenological stage. Conte et al (2009) also observed no significant effect on root dry matter in the cultivation of irrigated and non-irrigated corn.…”

Section: Resultsmentioning

confidence: 75%

Bulk density and water tensions in the soil on corn root production

Nunes

Bonfim-Silva

Silva

2016

Rev. bras. eng. agríc. ambient.

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Inadequate management of soil and water can cause changes in soil physical characteristics, resulting in lower root development. Thus the objective of the present study was to evaluate the dry matter production of corn roots under combinations of levels of bulk density and water tension in the soil. The experiment was conducted in a greenhouse in a randomized block design, based on a modified central composite design of a 52 fractional factorial scheme, of combinations of bulk densities (1.0, 1.2, 1.4, 1.6 and 1.8 Mg m-3) and water tensions in the soil (10, 20, 30 40 and 50 kPa), resulting in 13 treatments with four replicates. An Oxisol collected in the layer of 0-0.2 m was used. The pots were made of PVC (polyvinyl chloride) tube with compacted soil in the middle layer. The tensiometers were installed at a depth of 0.15 m, remaining in the central region of the compacted layer. The experiment was collected 104 days after sowing. Root dry matter production of corn was limited by increased water stress and bulk density.

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“…The increased dry mass of the roots was obtained at a nitrogen dose of 100 mg dm -3 , with an interaction of 15 kPa tension at the beginning of irrigation, producing 68.41 g, but when independent of fertilizer applied, the best results of the root dry mass were provided when the plant was subjected to irrigation when the soil water tension reached 15 kPa. Conte et al (2009) found no significant effect on the root dry mass in irrigated and non-irrigated maize, and the authors attributed this result to the high coefficient of variation of 36.0%. Analyzing the results of the soil water stress for irrigation in relation to fertilization with nitrogen for the production of the root dry mass of maize, only the voltages of 15.…”

Section: Resultsmentioning

confidence: 95%

Characteristics of maize production irrigation and time-varying doses of nitrogen

Schlichting¹,

Koetz²,

Bonfim-Silva³

et al. 2015

Afr. J. Agric. Res.

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Maize grown during the off season is a viable alternative for the state of Mato Grosso, Brazil. Therefore, the objective of the present study was to investigate the influence of the duration of irrigation with nitrogen doses on the yield characteristics of maize. The experiment was conducted in a greenhouse using a randomized completely block design with a factorial 5×5 matrix corresponding to 5 irrigation durations, the soil water tension at 15, 25, 35, 45 and 55 kPa and five doses of nitrogen (0, 50, 100, 150 and 200 mg dm -3 ), with four replications. The experimental units were represented by plastic pots with a capacity of 18 dm 3 of soil. We evaluated the productive characteristics of the maize plant. The data were submitted to the F test and polynomial regression. The increased dry mass of the shoot, the root dry mass and the ear length were obtained from the plant under irrigation when the soil reached a 15 kPa tension at doses of 100 and 150 mg dm -3 of nitrogen. For the weight of 100 grains, no interaction between the factors was found, providing a greater grain yield with 15 kPa and 200 mg dm -3 of nitrogen alone.

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Rendimento do milho em diferentes condições físicas de solo e quantidade de resíduo na ausência ou na presença de irrigação

Abstract: ABSTRACT

Cited by 6 publications

References 11 publications

Changes in a Rhodic Hapludox under no-tillage and urban waste compost in the northwest of Rio Grande do Sul, Brazil

Changes in a Rhodic Hapludox under no-tillage and urban waste compost in the northwest of Rio Grande do Sul, Brazil

Bulk density and water tensions in the soil on corn root production

Characteristics of maize production irrigation and time-varying doses of nitrogen

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