Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 5 )

2019 ( 41 )

2018 ( 55 )

2017 ( 48 )

Custom range...

Search Results: 1 - 10 of 21836 matches for " Henrique Duarte Vieira "
All listed articles are free for downloading (OA Articles)
Page 1 /21836
Display every page Item
Physiological Potential of Seeds of Perennial Soybean cv. Comum Coated with Different Materials  [PDF]
Priscilla Brites Xavier, Henrique Duarte Vieira
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.91001
Abstract: The aim of this study was to evaluate the effect of different seed coatings on the physiological potential of perennial soybean cv. Comum. The following treatments were tested: control (no coating); limestone + polyvinyl acetate (PVA); limestone + sand + PVA; limestone + charcoal + PVA; calcium silicate + PVA; calcium silicate + sand + PVA; and calcium silicate + charcoal + PVA. Seeds were evaluated for water content (WC), maximum diameter (MAD), minimum diameter (MID), 1000-seed weight (TSW), germination test, germination speed index (GSI), average germination time (AGT), emergence, emergence speed index (ESI), average emergence time (AET), shoot length (SL), root length (RL), dry and fresh matter of shoots (SDM and SFM), and dry and fresh matter of root (RDM and RFM). Coatings influenced GSI, AGT, emergence, and ESI, but germination was unaffected. The use of silicate with or without charcoal led to the same AET as that observed in the uncoated seeds. Coatings did not affect SFM, SDM, or RFM. Coating with limestone + sand + PVA or limestone + charcoal + PVA led to increases in SL, SFM, SDM, RFM, and RDM.
Response of Castor Bean Plants to Different Row Spacings and Planting Seasons  [PDF]
Guilherme Eugênio Machado Lopes, Henrique Duarte Vieira, Fábio Luiz Partelli
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A1002

The cultivation of the castor bean plant is prominent and important because of its potential for producing vegetable oils with special properties. However, research on cultivating castor bean plants is scarce, especially in areas with altitudes of 300 m or below. Moreover, the currently available cultivars have not been widely tested in Brazil. Thus, the aim of this study was to evaluate the response of the castor bean cultivar BRS Nordestina to different spacings at low altitudes during two cropping seasons. The study was conducted in the municipality of Itaocara, in the northwest Fluminense region, Brazil, which has an altitude of 60 m. The treatments consisted of five row spacings (1.5, 2.0, 2.5, 3.0 and 3.5 m) with 1 m between plants. The plants were cultivated in the 2007/2008 spring/summer season or in the 2008 autumn/winter season. A randomised block design with four replicates was used. The following parameters were assessed: plant height, height of insertion of primary raceme, number of racemes per plant, raceme length, number of fruits per raceme and grain yield. The spacing of 2.5 m between rows had the highest yield of castor beans during the two cropping seasons. The average yield of the cultivar BRS Nordestina indicates its potential for cultivation in northern Rio de Janeiro, below an altitude of 300 m. The yield was higher during the summer cropping season. The less-dense arrangement of the plant population contributed to the cultivation of plants with more racemes in both growing seasons.

Coating with Different Doses of Fertilizer in Vinhático Seeds  [PDF]
Priscila G. F. D. Sousa, Henrique Duarte Vieira, Amanda Justino Acha
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.810173
Abstract: Plathymenia reticulate Benth belongs to the family Fabaceae. It has its own hardwood for luxury furniture, and it is also used in construction. The coating consists in applying thin and uniform layers of inert adhesive mechanism in order to increase the seed size, altering his shape, texture and color, in addition to enabling common use of nutrients, fungicides, insecticides and microorganisms beneficial. The goal of this study was to evaluate the physical and physiological seeds quality of mahogany coated with different doses of fertilizer. The treatments were: T1: sand + lime; T2: sand + lime + 25 g of fertilizer; T3: sand + lime + 50 g of fertilizer; T4: sand + lime + 75 g of fertilizer; T5: sand + lime + 100 g of fertilizer, and control with uncoated seeds. Later, the seeds were evaluated in laboratory and greenhouse. The coating increased up to 91% weight of one thousand seeds without the treatment coated fertilizer. The presence of nutrient seed coating decreases his germination. The doses of fertilizer used were harmful to germination, IVG, emergency and IVE, but did not affect seedlings development.
Growth, Nutrient Content and SPAD Value of Corn in Monoculture and in Intercropping  [PDF]
Anna Christina Sanazário de Oliveira, Fábio Cunha Coelho, Henrique Duarte Vieira, Jocarla Ambrosim Crevelari, Raquel Fialho Rubim
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.518288

The objective of this study was to evaluate the growth, the nutrition, and the intensity of the green color in corn plants in monoculture and in intercropping with Mucuna aterrima, Crotalaria juncea, and Canavalia ensiformis, cultivated with different handlings. In general, corn plants in monoculture demonstrated greater growth and greater SPAD value in the first evaluation, despite presenting lower tenor of phosphorus in the leaves when related to the corn in intercropping. The weed helps in the growth of the corn plant and increases the SPAD value during flowering. The monoculture NPK (Nitrogen, Phosphorus and Potassium) fertilization promoted higher values in corn plant growth, as well as a greater SPAD value, at 30 d.a.e., of the plants. The NPK-fertilized corn plants showed a greater tenor of sulphur and a lower tenor of molybdenum. The corn in intercropping with M. aterrima resulted in smaller plants at 70 d.a.e. It also presented a greater tenor of molybdenum and lower tenor of nickel when compared to intercroppings with C. juncea and with C. ensiformis. The corn plants in a intercropping with Crotalaria juncea presented higher growth at 30 and 70 d.a.e. and greater tenors of molybdenum when compared to the plants in intercropping with C. ensiformis.

Emergence of Conilon Coffee Seedlings Originating from Seeds Treated with a Sodium Hypochlorite Solution  [PDF]
Raquel Fialho Rubim, Henrique Duarte Vieira, Eduardo Fontes Araújo, Anna Christina Sanazário de Oliveira, Alexandre Pio Viana
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513195

The coffee seeds are problematic for the physiologycal quality, featuring low speed of seedling emergence. In this sense, this work was developed with the objective of evaluating the effect of sodium hypochlorite in the removal of the parchment and in the emergence and seedlings development of conilon coffee in nursery conditions. Coffee seeds of the variety Victoria were used, which were harvested in the cherry stage and pulped by hand. Seeds were dried in an oven with forced ventilation until reaching moisture contents of 35%, 30% and 25% wet basis. Then, the seeds with parchment were soaked in a sodium hypochlorite solution with concentrations of 4%, 5%, 6% and 7% active chlorine for 3 and 6 hours. For each moisture content, two additional treatments were added consisting of seeds with parchment and seeds in which the structure was removed manually. The characteristics evaluated were: emergence speed index, total emergence, dry mass of the shoots and root system. Utilization of sodium hypochlorite promoted an acceleration in seedling emergence speed similar to the method for manual removal of the parchment when using concentrations of 4%, 5%, 6% and 7% for 3 hours, at all moisture contents.

Germination and Vigor of Fodder Fabacceae Seeds Submitted to in Vitro and in Situ Incubation  [PDF]
Renata Vianna Lima, Henrique Duarte Vieira, Tatiana Oliveira da Silva, Norberto da Silva Rocha, Bruno Borges Deminicis
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614235
Abstract: The current study was developed with the purpose to evaluate the germination and the vigor of Kudzu (Pueraria phaseoloides), Leucaena (Leucaena leucocephala) and Calopog?nio seeds (Calopogonium mucunoides) submitted to 0, 6, 12, 24, 48, 72 and 96 hours of testing to natural (in situ incubation) and simulated conditions (in vitro incubation) from the ruminal environment of bovines. For each period of in situ and in vitro incubation, in each kind of seed, the percentage of normal plants was evaluated, as well as abnormal plants, hard seeds, soaked seeds and dead seeds, besides the index of germination speed (IGS). The results were submitted to the Duncan test at a 5% probability. Higher percentages of normal plants were verified in the Kudzu and in the Leucaena kinds, when the seeds were submitted to in situ incubation, as well as the IGS for the three forage species. The Calopog?nio seeds did not turn out to be susceptible of use in the in situ and in vitro incubations. The in vitro incubation revealed to be more harmful to the seeds of the three species used.
Evaluation of Storage Potential of Jatropha curcas L. Seeds  [PDF]
Henrique Duarte Vieira, Alessandra Olmo Dardengo, Márcia Terezinha Ramos de Oliveira, Pedro Amorim Berbert, Bruno Borges Deminicis
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812204
Abstract: Ensuring the physiological quality of the seeds depends on storage conditions. Since their quality cannot be improved, good conditions during this period will contribute on keeping them viable for a longer time, delaying the deterioration process. In the present study, the effect of five storage periods in a refrigerated chamber at 15 ± 1, on the seeds viability during 30, 60, 90, 150 and 240 days of storage in glass containers was evaluated. Four replicates of twenty-five seeds per treatment were used and the data were compared by regression equation. It verified that, regardless of the storage time, the seeds when submitted to the drying temperature of 35 and 40 showed a significant linear reduction of germination, GSI and seed vigor after storage.
Estimative of Black Pepper leaf area with basis on the leaf blade linear dimension
Partelli, Fábio Luiz;Vieira, Henrique Duarte;Viana, Alexandre Pio;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000500039
Abstract: this research was aimed at establishing regression equations to estimate black pepper (piper nigrum) leaf area based on linear leaf measures. different black pepper varieties where growth on the field, four different size leaves were collected per plant with a total of 52 leaves to establish the regression equation and 28 to validate the equation for each variety (bragantina, la?ará, guajarina e cingapura). leaf midrib length (lml), maximum leaf broad width (mlbw) and leaf area (la) were measured. pearson's linear correlation coefficients were determined between observed and predicted measures with the observed la, besides estimating the linear regression equation for each variety. the equations best-fitted to estimate la based on circumscript rectangle were: 1) la = 2.2689 + 0.6900 x lml x mlbw; 2) la = 1.6402 + 0.6816 x lml x mlbw; 3) la = 1.4942 + 0.6215 x lml x mlbw and 4) la = 0.7467 + 0.6735 x lml x mlbw, for bragantina, la?ará, guajarina and cingapura varieties respectively. for all equations predicted values had high correlation coefficient with observed values thus showing that these equations must be variety specific and that they are appropriate for black pepper leaf area estimative.
Teste de tetrazólio para avalia??o da qualidade de sementes de Clitorea ternatea L.
Deminicis, Bruno Borges;Vieira, Henrique Duarte;Silva, Roberto Ferreira da;
Revista Brasileira de Sementes , 2009, DOI: 10.1590/S0101-31222009000200006
Abstract: this research verified different methods of pre-conditioning and concentrations of tetrazolium solutions for quality evaluation of butterfly pea seed. seeds collected in seropédica county (rj) e fortaleza county (ce) were submitted to the following methods of pre-conditioning: a) scarification with sandpaper and immersion in water at 25oc for 14 hours; and b) immersion in water at 95oc and left in the same water to rest without heating for 24 hours at 25oc. the teguments of the seeds were removed and the seeds were immerged in 0,1; 0,3 e 1% tetrazolium solution during 2 hours and 30 minutes at 25oc. to verify the reliability of the results through the tetrazolium test, germination test, first counting and index of germination velocity were done. scarification with sadpaper and immersion in water at 25oc for 14 hours were the most efficient in pre-conditioning butterfly pea seeds and 0,3% tetrazolium solution for 2 hours and 30 minutes at 25oc allow evaluating seeds of this species.
Qualidade fisiológica e resistência do recobrimento de sementes de milho
Concei??o, Patrícia Marluci da;Vieira, Henrique Duarte;
Revista Brasileira de Sementes , 2008, DOI: 10.1590/S0101-31222008000300007
Abstract: this work was developed with the objective of evaluating the physiologic quality of corn seeds uenf 506-8 covered and the resistance of the covering using different proportions of cement. it was used in the covering of the seeds a mixture of lime and culture media. as cement was used polivinil acetate glue (pva). the covering of the corn seeds was executed with a mixture of 70% (w/w) of lime, 10% (w/w) of semi-solid culture media jnfb and 20% (w/w) of water. in the mixture different proportions were added: 0,5; 1; 2; 3; 4 and 5% (w/w). evaluating the resistance of the covering was simulated the transport and the manual seeding, and the mechanical seeding of the covered seeds. the evaluation of the physiologic quality of the seeds was accomplished in seeds not covered and covered seeds with the proportions of cement: 0,5; 1; 2; 3; 4 and 5%. the increase of the proportion of cement of 2 for 3% caused a small reduction no significant in the speed of the germination, emergency speed and emergency, but it didn't affect the final number of normal plants in the germination test and cold test. for the manual seeding the use of 2% of cement is recommended and for the mechanical seeding 4% of cement.
Page 1 /21836
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.