Fontes alternativas à ureia no fornecimento de nitrogênio para o arroz irrigado

Marchesan, Enio; Grohs, Mara; Santos, Dâmaris Sulzbach; Formentini, Tiago Constante; Silva, Leandro Souza da; Sartori, Gerson Meneghetti Sarzi; Ferreira, Rafael Bruck

doi:10.1590/s0103-84782011001200003

Cited by 7 publications

(5 citation statements)

References 7 publications

(2 reference statements)

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“…The obtained data were compared with the results of plants irrigated with water of 3.0 dS m -1 from Experiment I, in which N fertilization corresponded to 100% of the recommendation. The data were analyzed in a randomized block design using a 3 × 2 factorial scheme, corresponding to the three scion-rootstock combinations (refered in Experiment I) and two N doses (100 and 200 mg kg -1 of soil N) was used as the N source as it has a high N concentration and a low cost/benefit ratio (MARCHESAN et al, 2011).…”

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confidence: 99%

Impact of Saline Conditions and Nitrogen Fertilization on Citrus Production and Gas Exchanges

et al. 2016

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-In two simultaneous experiments, we evaluated the impact of brackish irrigation water and nitrogen (N) fertilization on the production of citrus (scion-rootstock combinations) and its associated gas exchanges. These experiments were conducted at the Campus of Federal University of Campina Grande, Brazil in a protected environment (shade screens on the sides) using drainage lysimeters. Experiment I used a randomized block design (3 replicates), in a 5 × 3 factorial arrangement, corresponding to five water salinity levels (0.6, 1.2, 1.8, 2. . For both experiments, gas exchanges and mean mass of fruits were evaluated at harvest. Gas exchanges were inhibited in plants under saline stress. Plants grafted with Common Rangpur lime showed greater production potential than did the other genotypes studied, even under brackish water conditions.

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Impact of Saline Conditions and Nitrogen Fertilization on Citrus Production and Gas Exchanges

et al. 2016

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“…The experiment was conducted in 3 x 2 factorial scheme, which corresponded to three scion-rootstock combinations and two N doses, with three replicates and one plant per plot. Urea (45% of N) was used as the N source, which has the advantages of high N concentration and lower cost/benefit ratio (Marchesan et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Sousa

Gheyi

Brito

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThis study aimed to evaluate the salt tolerance of 'Mimo do Céu' orange grafted onto three rootstocks using physiological parameters such as maximum quantum efficiency of photosystem II (PSII) and the production of fruits. It also evaluated the effectiveness of increased nitrogen (N) fertilization in reducing the effects of salt stress. Two concomitant experiments were carried out under controlled conditions, using drainage lysimeters. The Experiment I evaluated the effects of the application of five levels of saline water on three combinations of scion-rootstocks grafted with 'Mimo de Ceu' orange, in a randomized block design with three replicates in a 5 x 3 factorial scheme. The Experiment II evaluated the application of two N levels (100 and 200% of recommendation) in three scion-rootstock combinations irrigated with water of electrical conductivity of 3.0 dS m -1 , in a 3 x 2 factorial scheme, with three replicates. The maximum quantum efficiency of PSII was inhibited in citrus plants under salt stress. 'Mimo do Ceu' orange grafted onto 'Common' Rangpur lime has higher yield potential. The increase in N dose did not reduce the deleterious effects of water salinity on fruit production.Eficiência quântica do fotossistema II e produção de laranjeira sob estresse salino e adubação nitrogenada R E S U M O Objetivou-se, com este trabalho, avaliar a tolerância ao estresse salino da laranjeira 'Mimo do Céu' enxertada em três porta-enxertos utilizando como parâmetros fisiológicos, a eficiência quântica do fotossistema II e a produção de frutos. Também se avaliou a eficiência máxima do incremento da adubação nitrogenada na redução dos efeitos do estresse salino; para tanto foram realizados dois experimentos concomitantes em condições controladas e com auxílio de lisímetros de drenagem. No Experimento I foram estudados em blocos casualizados com três repetições, em esquema fatorial 5 x 3, cinco níveis de salinidade da água e três combinações de copa/porta-enxerto e no Experimento II estudou-se a aplicação de duas doses de N (100 e 200% da recomendação) em plantas das três combinações de copa/porta-enxerto irrigadas com águas de condutividade elétrica de 3,0 dS m -1 , em esquema fatorial 3 x 2 com três repetições. A eficiência máxima quântica do PSII foi inibida nas plantas cítricas com estresse salino; já o aumento do teor salino da água de irrigação reduz a produção de frutos e a laranjeira 'Mimo do Céu' enxertada no Limoeiro Cravo 'Comum' possui maior potencial produtivo. O aumento na fertilização nitrogenada não reduziu os efeitos da salinidade sobre a produção total de frutos.

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“…Among the nitrogen fertilizers most used in coffee cultivation, urea is the most prominent. The use of this fertilizer has advantages such as lower cost per unit of N, high N concentration, low production cost, low corrosivity and lower acidifying power compared to other N sources (MARCHESAN et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Fertilizers Technologies for Coffee Plants

Chagas

Guelfi

Lacerda

et al. 2019

C.Sci.

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The application of urea in coffee crop has caused high losses of nitrogen (N) by volatilization, causing low use and recovery of this nutrient. This low use of N may interfere in the growth and nutrition of the coffee crop and thus, influence the efficiency of the nitrogen fertilization. The aim in this work was to assess the growth, nutritional and physiological characteristics and the agronomic efficiency of the nitrogen fertilization with different nitrogen fertilizer technologies. The experiment was performed in a greenhouse in pots with a volume of 14 L. In each pot, it was performed the transplanting of two plants of coffee. The experimental design was entirely randomized, with four replicates. The following nitrogen fertilizers were applied in the dose of 10g pot-1 , devided into three applications with interval of 50 days: Conventional urea; ammonium nitrate; urea + formaldehyde; Polyblen Extend ® ; Polyblen Montanha ® ; Urea + polyurethane; urea + plastic resin; ammonium sulfate + CaCO 3 and the control, without N application. After cropping, it was evaluated the growth, nutritional and physiological parameters. Afterward, it was calculated two agronomic efficiency index of the nitrogen fertilization. The highest values of plants height, the total dry mass of plants and leaf area in coffee seedlings were found with the application of Polyblen Extend ®. This blend also provided higher accumulation of N in the leaf and the whole plant. The application of Polyblen Extend ® provided higher agronomic efficiency and also enhanced the photosynthetic rate in the coffee plants.

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Fontes alternativas à ureia no fornecimento de nitrogênio para o arroz irrigado

Cited by 7 publications

References 7 publications

Impact of Saline Conditions and Nitrogen Fertilization on Citrus Production and Gas Exchanges

Impact of Saline Conditions and Nitrogen Fertilization on Citrus Production and Gas Exchanges

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Nitrogen Fertilizers Technologies for Coffee Plants

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