Coberturas vegetais e doses de nitrogênio em trigo sob sistema plantio direto

Melero, Mariana Moreira; Gitti, Douglas de Castilho; Arf, Orivaldo; Rodrigues, Ricardo Antônio Ferreira

doi:10.1590/s1983-40632013000400001

Cited by 15 publications

(12 citation statements)

References 19 publications

(32 reference statements)

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“…Especificamente, o nitrogênio e o potássio são os nutrientes absorvidos em maior quantidade pelo feijoeiro (PEREZ et al, 2013), soja (CAIRES & FONSECA, 2000), milho (BORGES, 2006), trigo (GARGANTINI et al, 1973), arroz (CRUSCIOL et al, 2003) e algodão (GARRIDO, 2009), o que fundamenta a compatibilidade do adubo verde com o cultivo precedente à instalação da maioria das culturas de relevância nacional. A palhada de C. juncea tem papel crucial para o incremento de nitrogênio e potássio no solo, com efeito positivo na produtividade dos cultivos (AMBROSANO et al, 2011;KAPPES et al, 2013;NOSSE et al, 2008;MELERO et al, 2013).…”

Section: Resultsunclassified

ACÚMULO DE NUTRIENTES E MASSA SECA PRODUZIDA POR Crotalaria juncea CULTIVADA NO CERRADO

Silva

Oliveira

Merloti³

et al. 2017

Revista Brasileira De Engenharia De Biossistemas

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A adubação verde com Crotalaria juncea é uma estratégia vastamente utilizada no Cerrado para melhorar as características químicas, físicas e biológicas do solo, em uma matriz que apresenta limitações naturais para o desempenho adequado dos cultivos. O objetivo do trabalho foi de verificar o acúmulo de nutrientes e produção de matéria seca por C. juncea cultivada em solo de Cerrado. Dois experimentos foram realizados nos anos de 2015 e 2016, em um Latossolo Vermelho distrófico, no município de Selvíria, MS, Brasil. As semeaduras foram realizadas a lanço em área previamente preparada com aração e gradagem, sem utilização de adubação. Aos 80 dias após a semeadura e antes do pleno florescimento, as plantas foram manejadas com roçadora. Foram feitas as seguintes avaliações: (a) Massa seca: amostras obtidas de cada parcela foram levadas à estufa, realizou-se a mensuração da massa seca e o valor médio foi extrapolado para unidade de kg ha -1 . (b) Acúmulo de nutrientes: após coleta de amostras das plantas, determinou-se os teores de macro e micronutrientes e, posteriormente, multiplicou-se o teor de cada nutriente pela massa seca de C. juncea produzida, obtendo-se o acúmulo de macronutrientes (g kg -1 ) e micronutrientes (mg kg -1 ). O adubo verde apresentou elevada produção de matéria seca e excelente acúmulo de nitrogênio, potássio e ferro. Palavras chave: reciclagem de nutrientes, adubação verde, prática conservacionista ACCUMULATION OF NUTRIENTS AND DRY MATTER PRODUCED BY Crotalaria juncea CULTIVED IN CERRADO ABSTRACTThe green manuring with Crotalaria juncea is a strategy widely used in the Cerrado to improve the chemical, physical and biological characteristics of the soil, in a matrix that presents natural limitations to the proper performance of the crops. The objective of this work was to verify the accumulation of nutrients and dry matter production by C. juncea cultivated in Cerrado soil. Two experiments were carried out in the years 2015 and 2016, in a dystrophic Red Latosol, in the city of Selvíria, MS, Brazil. Seeds were insered in an area with conventional preparation, without the use of fertilization. At 80 days after sowing and before blooming, the plants were managed mechanically. The following evaluations were performed: (a) Dry matter production: the samples obtained from the plants were desiccated and the average dry matter yield was extrapolated to a unit of kg ha -1 . (b) Accumulation of nutrients: after collecting plant samples, the macronutrients and micronutrients contents were determined and, posteriorly, the content of each nutrient was multiplied by the dry mass of C.* mssmarcio@yahoo.com

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Section: Resultsunclassified

ACÚMULO DE NUTRIENTES E MASSA SECA PRODUZIDA POR Crotalaria juncea CULTIVADA NO CERRADO

Silva

Oliveira

Merloti³

et al. 2017

Revista Brasileira De Engenharia De Biossistemas

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“…Evaluated agronomic characteristics were: weight of a thousand grain (g) (WTG), yield (kg ha -1 ) and hectoliter weight 3/7 (HW), all evaluated by using 250 mL of sample from each heavy plot (Melero et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Silicon dioxide and Bacillus subtilis applied in controlling wheat diseases

Telaxka

Faria

Maia

et al. 2019

Agraria

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Wheat is a crop that has high production; however, one of the limitations in planting is the presence of diseases, with the gibberella (Gibberella zeae) and yellow spot (Drechslera tritici-repentis) among them. Thus, the objective of this study was to evaluate the potential of fungicides based on strobilurins, silicon dioxide (SiO 2) and B. subtilis in controlling these diseases in wheat. The used treatments for all the experiments were: T1-SiO 2 ; T2-B. subtilis; T3-SiO 2 + B. subtilis; T4-trifloxystrobin + prothioconazole/trifloxystrobin + tebuconazole; T5-Control. For the field experiment, conducted in two locations, evaluations of the incidence of gibberella and yellow spot severity, crop agronomic characteristics and polyphenoloxidase (PPO) and phenylalanine ammonia-lyase (PAL) activities were carried out. According to the obtained results, the fungicides based on strobilurins and SiO 2 reduced the severity of the yellow spot, increasing, on average, 10 g the weight of a thousand grains (WTG) and the activity of the PPO and PAL enzymes in both municipalities. Hence, SiO 2 possibly activated the defense mechanisms of these plants disease severity.

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“…As the experiment by Melero et al (2013), which states, the higher the N doses, the greater the tendency of the plants to be as a consequence of higher lodging. In order to reduce this problem, it is possible to use growth regulators, which have the function of reducing the size of plants.…”

Section: Resultsmentioning

confidence: 90%

Nitrogen Dose Fractionation In Different Stages of Application In Wheat

2017

Aust. J. Basic & Appl. Sci.

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Wheat has high grain yield potential, however in practice such potential has demonstrated low expression. Many studies are carried out on the crop in order to maximize its productivity due to its food importance. Nitrogen is the nutrient most required by this crop, therefore essential for its development. This research had the objective of evaluating the application of a dose of nitrogen, fractionated at different times. The experiment was carried out in the experimental field of UNISEP, DoisVizinhos-PR, in Red Dystrophic UmbricNitosol soil type, conducted in a randomized block design, with five replications. The treatments consisted of the fractionation of the application of the dose of 150 kg ha-1 nitrogen, being: 0 kg ha-1; 50 kg ha-1 applied in tillering, rubbering and earning; 75kg ha-1 applied in tillering and rubbering; 150 kg ha-1 applied in tillering. The source of nitrogen used was urea (45-00-00). The plots present an area of 15 m2, consisting of 17 lines of 0.17m x 5m in length. The number of tillers, plant height, dry matter mass, severity of leaf diseases, hectolitre weight and productivity were evaluated. The results were submitted to analysis of variance and when significant to the Tukey test (p <0.05). Fractionation of the studied N dose, under the specific conditions, showed no significant difference for plant height, dry matter and severity. The fractionation of the 150 kg ha-1 dose at different times of application in the wheat crop influenced the number of tillers, hectolitre weight and productivity. It was concluded that different doses and fractionation of these should be tested in future studies to obtain more conclusive data.

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Coberturas vegetais e doses de nitrogênio em trigo sob sistema plantio direto

Cited by 15 publications

References 19 publications

ACÚMULO DE NUTRIENTES E MASSA SECA PRODUZIDA POR Crotalaria juncea CULTIVADA NO CERRADO

ACÚMULO DE NUTRIENTES E MASSA SECA PRODUZIDA POR Crotalaria juncea CULTIVADA NO CERRADO

Silicon dioxide and Bacillus subtilis applied in controlling wheat diseases

Nitrogen Dose Fractionation In Different Stages of Application In Wheat

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