Efeito do Nitrogênio em genótipos de arroz cultivados em várzea úmida do Estado do Tocantins

Kischel, Elisângela; Fidélis, Rodrigo Ribeiro; Santos, Manoel Mota dos; Brandão, Diogo Ribeiro; Cancellier, Eduardo Lopes; Nascimento, Ildon Rodrigues do

doi:10.1590/s0034-737x2011000100013

Cited by 14 publications

(15 citation statements)

References 11 publications

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“…There are also reports of reductions in mass of 100 grains with increasing levels of N (BUZETTI et al, 2006;MINGOTTE;HANASHIRO;FORNASIERI FILHO, 2013). According to Kischel et al (2011) this can be due to excess nitrogen, resulting in luxury consumption in which the plant prioritizes growth at the expense of grain mass.…”

Section: Upland Rice Production Variablesmentioning

confidence: 99%

Biochar as Soil Conditioner in the Succession of Upland Rice and Cowpea Fertilized With Nitrogen

et al. 2017

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-The effects of biochar and nitrogen application on yields of upland rice and cowpea and on soil fertility were determined in a greenhouse in Macaíba, RN, Brazil. The trial consisted of the succession of two crops in a completely randomized design and a factorial scheme, with four replicates. Initially, four doses of biochar and four doses of nitrogen were tested for cultivation of rice. Subsequently, four doses of biochar and two doses of nitrogen were tested in half of the pots maintained for planting cowpea. Soil was sampled after rice harvest for half of the pots and at end of the trial for the remaining pots. We evaluated the following parameters: mass of hundred grains of rice, dry shoot mass, panicle number, number of filled spikelets and of empty spikelets, and grain production. Determinations for cowpea were: pod number per pot, grain number per pod, and grain production per pot. Measured soil parameters were: pH, contents of organic carbon, P, K, Ca, Mg, Na, cation exchange capacity, and exchangeable sodium percentage. Biochar addition did not influence yield components of upland rice and cowpea, but resulted in increased soil N retention, which influenced rice dry shoot mass, spikelets sterility, panicle number, and grain mass. Biochar also promoted increased soil pH, potassium content, and exchangeable sodium percentage and decreased calcium and magnesium concentrations.Keywords: Oryza sativa. Vigna unguiculata. Charcoal. Carbon sequestration. CARVÃO VEGETAL COMO CONDICIONADOR DE SOLO NA SUCESSÃO ARROZ E FEIJÃO-CAUPI ADUBADOS COM NITROGÊNIORESUMO -Os efeitos da aplicação de carvão vegetal e nitrogênio sobre a produtividade de arroz de terras altas e feijão-caupi e a fertilidade do solo foram determinados em ambiente protegido em Macaíba, RN, Brasil. O experimento constou de dois cultivos sucessivos em delineamento experimental completamente casualizado em arranjo fatorial, com quatro repetições. Inicialmente, foram testadas quatro doses de carvão vegetal e quatro de nitrogênio para a cultura do arroz. A seguir, foi cultivado feijão-caupi em metade dos vasos (quatro doses de carvão e duas de nitrogênio). O solo foi amostrado após a colheita do arroz, em metade dos vasos, e ao final do experimento, nos vasos restantes. Do arroz foram determinados, massa de cem grãos e, por vaso, massa seca da parte aérea, número de panículas, número de grãos cheios e grãos vazios e produção de grãos. Do feijão-caupi foram determinados: número de vagens por vaso, número de grãos por vagem e produção de grãos por vaso. No solo foram determinados: pH, teores de carbono orgânico, P, K, Ca, Mg e Na, capacidade de troca de cátions e percentagem de sódio trocável. As doses de carvão vegetal não influenciaram nas características de produção do arroz e feijão-caupi, mas favoreceram a retenção de nitrogênio no solo, que se refletiu sobre massa seca da parte aérea do arroz, esterilidade das espiguetas, número de panículas e massa dos grãos. Além disso, promoveram aumento no pH, teor de potássio e percentagem de sódio tro...

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Section: Upland Rice Production Variablesmentioning

confidence: 99%

Biochar as Soil Conditioner in the Succession of Upland Rice and Cowpea Fertilized With Nitrogen

et al. 2017

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“…In general, N provides greater development, leaf area index and plant height (Kichel et al, 2011;Passos et al, 2015). On the other hand, depending on the amount of N available, growth in height may favor lodging (Chen et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Can the Nitrogen and Silicon Increase the Productivity and Yield in Rice Crops in the Rainfed Environment?

Jardim¹,

Biesdorf²,

Barros³

et al. 2019

JAS

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There is much doubt as to whether, in fact, the combination of nitrogen and silicate fertilization can increase yield and post-harvest yield in rainfed rice. The objective of this study was to investigate the effect of silicate and nitrogen fertilization on the development, quality, yield and post-harvest yield of rice cultivated in the rainfed environment. A field experiment was carried out in the 2014/2015 harvest in a 4 × 4 randomized block design with four replications. The first factor corresponded to the nitrogen doses (0; 50; 100 and 200 kg ha-1 of N), in the form of urea, and the second factor at silicon doses (0; 7.5; 15 and 30 kg ha-1 Si), in the form of calcium silicate. Si affected the chlorophyll content at 45 days after sowing (DAS) suggesting being important in floral differentiation. The increase in N doses caused higher levels of chlorophyll in rice leaves at 55, 65 and 85 DAS, regardless of whether they supplied Si. Plant height, number of tillers, weight of one thousand seeds, total grain yield and of whole grains were not influenced by the Si supply. However, Si doses reduced the yield of broken grains, thus reducing postharvest losses and, consequently, improving grain quality in the beneficiation process.

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“…This ecotone covers approximately 600,000 square kilometers, and consists of several physiognomies that form a vegetation mosaic [18]. The large floodplain in the state of Tocantins covers an area larger than 500,000 hectares [19] and is used intensively for the cultivation of grains and fruits. In this region, the areas evaluated are located in the Praia Alta farm, in the municipality of Lagoa da Confusão (10˝47 1 21.37"S, 49˝37 1 26.51"W), in the state of Tocantins (Figure 1).…”

Section: Study Areas and Soil Samplingmentioning

confidence: 99%

Structure of Fungal Communities in Sub-Irrigated Agricultural Soil from Cerrado Floodplains

et al. 2016

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This study aimed to evaluate the influence of soybean cultivation on the fungal community structure in a tropical floodplain area. Soil samples were collected from two different soybean cropland sites and a control area under native vegetation. The soil samples were collected at a depth of 0-10 cm soil during the off-season in July 2013. The genetic structure of the soil fungal microbial community was analyzed using the automated ribosomal intergenic spacer analysis (ARISA) technique. Among the 26 phylotypes with abundance levels higher than 1% detected in the control area, five were also detected in the area cultivated for five years, and none of them was shared between the control area and the area cultivated for eight years. Analysis of similarity (ANOSIM) revealed differences in fungal community structure between the control area and the soybean cropland sites, and also between the soybean cropland sites. ANOSIM results were confirmed by multivariate statistics, which additionally revealed a nutrient-dependent relation for the fungal community structure in agricultural soil managed for eight consecutive years. The results indicated that land use affects soil chemical properties and richness and structure of the soil fungal microbial community in a tropical floodplain agricultural area, and the effects became more evident to the extent that soil was cultivated for soybean for more time.

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Efeito do Nitrogênio em genótipos de arroz cultivados em várzea úmida do Estado do Tocantins

Cited by 14 publications

References 11 publications

Biochar as Soil Conditioner in the Succession of Upland Rice and Cowpea Fertilized With Nitrogen

Biochar as Soil Conditioner in the Succession of Upland Rice and Cowpea Fertilized With Nitrogen

Can the Nitrogen and Silicon Increase the Productivity and Yield in Rice Crops in the Rainfed Environment?

Structure of Fungal Communities in Sub-Irrigated Agricultural Soil from Cerrado Floodplains

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