Avaliação do efeito de doses e fontes de nitrogênio sobre variáveis morfológicas, interceptação de radiação e produtividade do girassol

Schwerz, Felipe; Caron, Braulio Otomar; Elli, Elvis Felipe; Oliveira, Douglas Machado de; Monteiro, Gean Charles; Souza, Velci Queiróz de

doi:10.1590/0034-737x201663030015

Cited by 12 publications

(16 citation statements)

References 12 publications

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“…A similar response had [21], which found a quadratic effect of nitrogenous fertilization in clonal seedlings of cocoa. [16], verified the nitrogen fertilization has contributed positively to the initial development of seedlings of Umbuzeiro, demonstrated by an increase in leaf area and in other parameters as well as similar results found for [29] in Sunflower.…”

Section: Fig 3: the Diameter Of The Stem Of The Cupuaçu Tree Seedlinsupporting

confidence: 78%

Influence of Nitrogen Fertilizer on Seedling Production of CUPUAÇUZEIRO (Theobroma grandiflorum Schum.)

Campos¹,

Milhomem²,

Siebeneichler³

et al. 2019

International Journal of New Technology and Research

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The Cupuaçuzeiro (Theobroma grandiflorum Schum.) is widely cultivated in tropical regions of Brazil but has a few recommendations and requirements. The quality and growth of seedlings can be improved by nitrogen fertilization. The objective of this work was to evaluate the influence of different dosages of urea applied and coverage in the substrate for the seedling production of the Cupuaçu tree. The experiment was installed in the University campus of Gurupi from Universidade Federal the Tocantins in the first half of 2010. The experimental design used was the random blocks with four repetitions and five treatments, being 0, 20, 40, 60 e 80 mg dm−3 the basis of urea nitrogen. Each parcel consisted of five seedlings queued. Were measured weekly the diameter and height of the aerial part. The 72 DAE, the seedlings were collected for the evaluation of the following biometric data: average leaf area (cm2), average leaf area, and total and total (g), the relationship APA/DC, APA/ MSPA and the Dickson quality index (IQD). The results were subjected to polynomial regression analysis to evaluate the effects of doses of nitrogen, testing the linear and quadratic models. The relation and height of the aerial part by the diameter of the stem and height of the aerial part by the dry mass of the aerial part showed that fertilizations between 74 and 80 mg.dm−3 of N should provide Cupuaçu seedlings more balanced. The IQD indicated that doses of 66 mg.dm-3 of N may promote a better quality standard of Cupuaçu tree seedlings.

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Section: Fig 3: the Diameter Of The Stem Of The Cupuaçu Tree Seedlinsupporting

confidence: 78%

Influence of Nitrogen Fertilizer on Seedling Production of CUPUAÇUZEIRO (Theobroma grandiflorum Schum.)

Campos¹,

Milhomem²,

Siebeneichler³

et al. 2019

International Journal of New Technology and Research

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“…Tomich et al (2003) found plant height of 2.05 m, whereas Biscaro et al (2008) estimated that the N dose of 73 kg ha -1 was associated with plant height of 1.15 m, which is inferior to the value found in the present study for a similar N dose (Figure 1). On the other hand, Schwerz et al (2016) did not observe effect of N fertilization on sunflower height.…”

Section: Resultsmentioning

confidence: 63%

Nitrogen and phosphorus fertilization of sunflower crop in alkaline Cambisol

Braga

Oliveira

Santos

et al. 2018

Rev. bras. eng. agríc. ambient.

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A B S T R A C TSunflower is a crop that has aroused the interest of farmers because of its adaptability to wide climatic conditions and for its use in biodiesel production. However, there are only a few studies on sunflower fertilization in alkaline soils. This study aimed to evaluate nitrogen (N) and phosphorus (P) fertilization in sunflower (Helianthus annuus L.) cultivated in alkaline soil. A field experiment was carried out in Baraúnas-RN, Brazil, in a Haplic Cambisol derived from calcareous rock, where the sunflower H-251 hybrid was cultivated. The treatments were a combination of four doses of N (30, 60, 90 and 120 kg ha -1 ) and four doses of P 2 O 5 (30, 60, 90 and 120 kg ha -1 ). Sunflower growth and yield increased with the doses of N and P 2 O 5 . Doses of 30 kg ha -1 of N and 30 kg ha -1 of P 2 O 5 were more economical, corresponding to grain yield of 2378 kg ha -1 . Critical levels associated with these doses of N and P 2 O 5 were 28.2 g kg -1 for N leaf content, 2.84 for P leaf content, and 6.75 mg dm -3 for soil available P extracted by Mehlich-1.Adubação nitrogenada e fosfatada na cultura do girassol em Cambissolo alcalino R E S U M O O girassol é uma cultura que tem despertado o interesse dos produtores por sua adaptabilidade a diferentes condições climáticas e pela possibilidade de produção de biodiesel. Porém, pesquisas sobre adubação de girassol em solos alcalinos são escassas. Neste trabalho, objetivou-se avaliar a resposta da cultura do girassol (Helianthus annuus L.) à adubação nitrogenada e fosfatada em solo alcalino. O experimento de campo foi conduzido no município de Baraúnas, RN, em um Cambissolo Háplico eutrófico, onde se plantou o híbrido de girassol H-251. Os tratamentos resultaram da combinação de quatro doses de N (30, 60, 90 e 120 kg ha -1 ) e quatro doses de P 2 O 5 (30, 60, 90 e 120 kg ha -1 ). O crescimento e a produtividade do girassol aumentaram com o incremento das doses de N e de P 2 O 5 . As doses de 30 kg ha -1 de N e 30 kg ha -1 de P 2 O 5 se mostraram mais econômicas, correspondendo à produtividade de 2.378 kg ha -1 de grãos. Os níveis críticos associados a essas doses econômicas de N e de P 2 O 5 foram 28,2 g kg -1 para o teor de N na folha, 2,84 g kg -1 para o teor de P na folha, e 6,75 mg dm -3 para o P disponível no solo pelo extrator Mehlich-1.

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“…The LAI is the main factor responsible for determining the solar interception rate of a culture (29) . However, the radiation interception depends on other factors besides the LAI, such as the number, size and angle of leaves, the weather, and the management practices (30) .…”

Section: Resultsmentioning

confidence: 99%

Solar Radiation Use Efficiency and Gross Protein of Sorghum Forage Are Modified by the Cutting Management

et al. 2019

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The purpose of this study is to determine the growth, the solar radiation use efficiency, and the gross protein of sorghum forage under different cutting management. A unifactorial design in random blocks (cutting management) was used, varying from no-cut treatment to four cuts. The first cut occurred 44 days after sowing, the second one after 23 days of regrowth, the third one after 25 days of regrowth, and the last one after 40 days of regrowth. The efficiency of the sorghum forage's solar radiation use reduces as the number of cuts increases. The sorghum forage's gross protein increases with cutting management. Therefore, for a sorghum forage crop, it is recommended to restrain the cutting management up to three times during the crop cycle, since it has the biomass potential production, and the cuts should be made at every 25 days, depending on the increase of dry mass. After that, the cutting management should not be done, mainly due to the low radiation use efficiency, reduced dry mass accumulation, and low material quality.

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Avaliação do efeito de doses e fontes de nitrogênio sobre variáveis morfológicas, interceptação de radiação e produtividade do girassol

Cited by 12 publications

References 12 publications

Influence of Nitrogen Fertilizer on Seedling Production of CUPUAÇUZEIRO (Theobroma grandiflorum Schum.)

Influence of Nitrogen Fertilizer on Seedling Production of CUPUAÇUZEIRO (Theobroma grandiflorum Schum.)

Nitrogen and phosphorus fertilization of sunflower crop in alkaline Cambisol

Solar Radiation Use Efficiency and Gross Protein of Sorghum Forage Are Modified by the Cutting Management

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