EMISSÃO DE ÓXIDO NITROSO ASSOCIADO AO USO DE UREIA NO CULTIVO DE MELÃO AMARELO

O meloeiro tem grande importância econômica para o Nordeste brasileiro. Entretanto, em seu cultivo utiliza-se insumos que podem prejudicar o ambiente; como, os fertilizantes nitrogenados. Objetivou-se avaliar a emissão de N2O em cultivo de meloeiro amarelo ‘Goldex’. O experimento foi instalado em delineamento inteiramente casualizado, com cinco repetições. Os tratamentos foram: 0 (controle), 1,0; 1,5 e 2 vezes a quantidade de nitrogênio recomendada para cada estádio. Foi analisado o fluxo de N2O, área foliar, número de folhas, massa seca da parte aérea, massa seca dos frutos, massa seca da parte radicular, nitrogênio total do solo, das plantas e N (NH4+ e NO3-) do solo. O fluxo de N2O teve comportamento temporal irregular durante a fase de plântulas e crescente na floração. Os tratamentos afetaram significativamente a área foliar, número de folhas, massa seca da parte aérea, massa seca da parte radicular, nitrogênio da parte aérea e parte radicular das plantas e do solo. A aplicação de nitrogênio, em dosagens superiores à recomendada, não aumentou a produção do meloeiro. E o cálculo do fator de emissão mostrou que a emissão do N2O não atingiu valores prejudiciais ao ambiente.Palavras-chave: fator de emissão, efeito estufa e nitrogênio. NITROUS OXIDE EMISSION ASSOCIATED WITH UREA USE THE YELLOW MELON CROP ABSTRACT: The melon has great economic importance for the Brazilian Northeast. However, in its cultivation uses inputs that can harm the environment; Such as nitrogen fertilizers. The objective of this study was to evaluate the emission of N2O in yellow 'Goldex' cultivar. The experiment was installed in a completely randomized design with five replications. The treatments were: 0 (control), 1.0; 1.5 and 2 times the amount of nitrogen recommended for each stage. N2O flux, leaf area, leaf number, shoot dry mass, fruit dry mass, dry mass of the root portion, total soil nitrogen, of the plants and N (NH4 + and NO3 -) of the soil were analyzed. The flow of N2O had irregular temporal behavior during the seedling phase and increased in flowering. The treatments affected significantly the leaf area, number of leaves, dry mass of the aerial part, dry mass of the root part, nitrogen of the aerial part and root part of the plants and the soil. The application of nitrogen, in dosages higher than the recommended one, did not increase the production of the melon. And the calculation of the emission factor showed that the emission of N2O did not reach values harmful to the environment.Keywords: emission fator, greenhouse and nitrogen.

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Ruellia simplex cuttings propagation produced on carnauba waste substrate

Revista Agro mbiente On-line ◽

10.18227/1982-8470ragro.v14i0.6185 ◽

2020 ◽

Vol 14 ◽

Author(s):

Taciella Fernandes Silva ◽

Klayton Antonio Do Lago Lopes ◽

Janaiane Ferreira Dos Santos ◽

Ana Paula De Almeida Sousa ◽

Francisca Gislene Albano-Machado ◽

...

Keyword(s):

Root System ◽

Aerial Part ◽

Ornamental Plants ◽

Dry Mass ◽

Fresh Mass ◽

Randomized Design ◽

Shoot Number ◽

Significant Difference ◽

Number Of Leaves ◽

Completely Randomized Design

The production of quality seedlings is necessary for the trading of ornamental plants. Seedling quality depends on several factors, among these factors, the substrate is highlighted. Thus, this study aimed to evaluate the effect of substrates based on bagana of carnauba, in the production of Ruellia simplex seedlings, by vegetative propagation. A completely randomized design was adopted, with six treatments and four replications. The treatments (substrates) were composed of bagana of carnauba (BC) and soil, in the following proportions: BC0 - 0% BC + 100% of soil; BC20 - 20% BC + 80% of soil; BC40 - 40% BC + 60% of soil; BC60 - 60% BC + 40% of soil; BC80 - 80% BC + 20% of soil; BC100 - 100% BC + 0% of soil. The plot consisted of a plant. After 45 days of cutting, it was evaluated: number of shoots; number of leaves per shoot; diameter of the highest shoot; length of the highest shoot; root length; inflorescence number; number of flowers per inflorescence; leaf area; root volume; aerial part fresh mass; root system fresh mass; aerial part dry mass; and root system dry mass. There was a significant difference for the variables, number of leaves per shoot, diameter and length of the highest shoot, number of flowers per inflorescence, fresh and dry mass of the aerial part. Having a direct relationship between the increase in the proportion of bagana of carnauba volume and the inflorescence number, the substrate 100% of bagana of carnauba is indicated.

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Initial interference of Cyperus rotundus L. in pre-sprouted seedlings of sugarcane cultivars RB985476 and IACSP95-5000

Agronomía Colombiana ◽

10.15446/agron.colomb.v36n3.73317 ◽

2018 ◽

Vol 36 (3) ◽

pp. 210-216

Author(s):

Ana Ligia Giraldeli ◽

Felipe Carrara de Brito ◽

André Felipe Moreira Silva ◽

Giovani Apolari Ghirardello ◽

Ana Carolina Viviani Pagenotto ◽

...

Keyword(s):

Factorial Design ◽

Leaf Area ◽

No Reduction ◽

Dry Mass ◽

Cyperus Rotundus ◽

Weed Interference ◽

Randomized Design ◽

Number Of Leaves ◽

Completely Randomized Design

Weeds compete with plants for water, light, nutrients and space. In sugarcane, planting pre-sprouted sugarcane seedlings (PSS) may mean a change in weed interference and management. The aim of this study was to generate information on the interference of Cyperus rotundus L. in PSS. Two experiments were carried out in a completely randomized design, one with cultivar RB985476, with seven densities of C. rotundus (0, 17, 35, 70, 140, 280 and 560 plants m-2), and the second with cultivar IACSP95-5000, with four densities of C. rotundus (0, 70, 140 and 280 plants m-2). For this weed, a 2x6 factorial design was used for the experiment with RB985476 and a 2x3 design was used for IACSP95-5000, the first factor being absence and presence of the crop, and the second factor the densities of the species. Biometric evaluations of height, diameter, number of tillers and leaves, leaf area and dry mass were carried out. The PSS had a reduction in height, number of leaves and leaf area in the main till at 60 d after planting (DAP) in RB985476. For the IACSP95-5000 cultivar, there was no reduction in the analyzed variables. The average dry mass per plant of C. rotundus decreased as the density of the species increased in the absence of PSS.

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Macronutrient fertilizers on basil growth and yield

Comunicata Scientiae ◽

10.14295/cs.v11i0.3200 ◽

2020 ◽

Vol 11 ◽

pp. e3200

Author(s):

Janderson Carmo Lima ◽

Marilza Neves Nascimenro ◽

Uasley Caldas Oliveira ◽

Anacleto Ranulfo Santos ◽

Alinsmario Leite Silva

Keyword(s):

Leaf Area ◽

Growth Parameters ◽

Dry Mass ◽

Growth And Yield ◽

Randomized Design ◽

Leaf Dry Mass ◽

Number Of Leaves ◽

Completely Randomized Design ◽

Reference Doses ◽

Different Doses

The objective of this work was to determine the macronutrient doses that allow the highest phytomass yield and growth of basil plants. The experiment was carried out in the experimental area of the Federal University of Recôncavo da Bahia, in Cruz das Almas, BA, in a greenhouse. The treatments were obtained according to the Baconian matrix statistical arrangement, in which one of the nutrients is supplied in variable amounts, while the others are kept at a referential level. Six nutrients (nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S)) were evaluated in three different doses, and two additional treatments, one with reference doses and another without nutrient addition, totaling 20 treatments that were arranged in a completely randomized design with five replications, totaling 100 experimental units. At 50 days after treatment distribution, the growth parameters were evaluated: Plant height, number of leaves, leaf dry mass, stem, root and leaf area. It was observed that the highest leaf dry mass accumulation was estimated with the dose of 250 mg dm³ of N giving an average of 8.01g per plant, being significantly higher when compared to all other tested elements, this parameter is extremely relevant because the leaves are characterized as the main product of this species. Phosphorus doses allowed significant results in height and leaf area, whereas K favored higher leaf emission. Positive responses were verified for nutrients Ca, Mg and S in all parameters tested at levels above those tested as reference.

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Efficacy of substrate and humic substance on cuttings production of Spondia purpurea L.

Research Society and Development ◽

10.33448/rsd-v9i8.5006 ◽

2020 ◽

Vol 9 (8) ◽

pp. e60985006

Author(s):

Paula Sara Teixeira de Oliveira ◽

Fabíola Luzia de Sousa Silva ◽

Kleber Veras Cordeiro ◽

Gustavo dos Santos Sousa ◽

Rafaela Leopoldina Silva Nunes ◽

...

Keyword(s):

Humic Substances ◽

Leaf Area ◽

Humic Substance ◽

Rice Husk ◽

Aerial Part ◽

Dry Mass ◽

Root Volume ◽

Substrate Interaction ◽

Randomized Design ◽

Completely Randomized Design

For the propagation of seedlings by cutting it is important to select an appropriate substrate. Additionally, the use of humic substances can stimulate the growth of the plants, as is already known for many species. We aimed to investigate the influence of substrates based on carnauba bagana and carbonized rice husk associated with humic substance - HS in the production of Spondia purpurea L. seedlings by cuttings. We studied three proportions (v:v) of substrates, namely, 100% carbonized rice husk; 50% carnauba bagana + 50% carbonized rice husk; 100% carbonized rice husk and four doses of the humic substance, namely, 0 g L-1; 12.5 g L-1; 25 g L-1; 50 g L-1. The experiment was arranged in a completely randomized design, in a 3x4 factorial with four replicates. There was a significant effect of HS doses and substrate interaction and HS doses on the leaf area and dry mass of the aerial part of seedling seedlings. Root volume was affected in isolation by the factors tested. The interaction responses between the substrate and doses of humic substance infer that they act in different ways on development of seriguela seedlings according to the type of substrate, therefore, it is essential to identify and choose the compiled that favors the best results. There is then a need test other substrates associated with the addition of HS, already known to condition the increase of seriguela seedlings produced by cuttings.

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Pengaruh Pemberian Pupuk Organik Cair Nasa Dan Pupuk Kompos Terhadap Pertumbuhan Tanaman Kenaf ( Hibiscus cannabinus L)

Agrifarm : Jurnal Ilmu Pertanian ◽

10.24903/ajip.v7i1.364 ◽

2018 ◽

Vol 7 (1) ◽

pp. 6

Author(s):

Hairin Juanda ◽

Tutik Nugrahini ◽

Mahdalena Mahdalena

Keyword(s):

Plant Growth ◽

Leaf Area ◽

Plant Height ◽

Analysis Of Variance ◽

Organic Fertilizer ◽

Hibiscus Cannabinus ◽

Stem Diameter ◽

Randomized Design ◽

Number Of Leaves ◽

Completely Randomized Design

Effect of NASA Liquid Organic Fertilizer and Compost Fertilizer on Kenaf Plant Growth (Hibiscus cannabinus L). This study aims to determine the effect of NASA POC, compost fertilizer and the interaction of NASA POC and compost fertilizer on kenaf plants. This research was carried out at East Borneo Samarinda Indonesia. with a time of ± 4 months, starting from June to September 2016. The design of the study uses factorial completely randomized design (CRD) consisting of 2 treatments and 4 replications. The treatment consists of 2 factors. The first factor is the administration of NASA POC consisting of 4 levels, namely: j0: Control (without treatment), j1: POC with a concentration of 10 ml / liter of water, j2: POC with a concentration of 15 ml / liter of water, j3: POC with a concentration of 20 ml / liter of water. The second factor is Compost fertilizer consisting of 4 levels, namely: k0: Without the provision of Compost Fertilizer, k1: Composting 500 gram / polybag, k2: Composting Fertilizer 700 grams / polybag, k3: Composting 800 grams / polybag. From the analysis of variance showed that the effect of giving NASA POC (J), compost (K) and the interaction of NASA POC and compost (JK) did not affect the parameters of plant height 30 DAP, 60 DAP and 90 DAP, stem diameter 30 DAP, 60 DAP and 90 DAP, number of leaves 30 DAP, 60 DAP and 90 DAP, leaf area 30 DAP, 60 DAP and 90 DAP.

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Trichoderma Contributes to the Germination and Seedling Development of Açaí Palm

Agriculture ◽

10.3390/agriculture10100456 ◽

2020 ◽

Vol 10 (10) ◽

pp. 456

Author(s):

Bruno Fróes Campos ◽

Anselmo Junior Corrêa Araújo ◽

Cristina Aledi Felsemburgh ◽

Thiago Almeida Vieira ◽

Denise Castro Lustosa

Keyword(s):

Dry Mass ◽

Initial Growth ◽

Randomized Design ◽

Trichoderma Isolate ◽

Number Of Leaves ◽

Collar Diameter ◽

Completely Randomized Design ◽

Set Up ◽

Root Size ◽

Trichoderma Isolates

The application of Trichoderma fungus can be used to obtain seedlings of higher quality for plantations. The objective of this study was to evaluate the effects of Trichoderma isolates on the germination and initial growth of açaí seedlings. Two trials were set up. In the laboratory, the seeds were inoculated in suspensions prepared with each of the isolates for 24 h, and they were arranged in trays containing filter paper in a completely randomized design with five replicates containing 50 seeds each. For the control, the seeds were submerged only in water. Part of the seedlings resulting from seeds treated and not treated with Trichoderma were transferred to bags containing forest soil and were submitted to seven modes of application of Trichoderma and kept in a nursery. The speed of germination and hypocotyl were not influenced by the biological treatment. The application of the different Trichoderma isolates positively influenced the height, collar diameter, number of leaves, root size, leaf area and root, and aerial part dry mass of the açaí seedlings. The application of the Trichoderma isolate TAM01 on the preplanting substrate and biweekly applications on the postplanting substrate was the combination that most positively influenced the development of açai seedlings.

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Crescimento e produção de alface em resposta a níveis de drilocomposto e NPK

Colloquium Agrariae ◽

10.5747/ca.2020.v16.n3.a368 ◽

2020 ◽

Vol 16 (3) ◽

pp. 18-26

Author(s):

Angelita Aparecida Coutinho Picazevicz ◽

Arnaldo Libório Santos Filho ◽

Leonardo dos Santos França Shockness ◽

Luana Silva Lima ◽

Karoliny Fim da Silva ◽

...

Keyword(s):

Aerial Part ◽

Dry Matter ◽

Dry Mass ◽

Root Mass ◽

Randomized Design ◽

Completely Randomized Design ◽

Npk Fertilization

The objective was to evaluate the effects of levels of compost and fertilization with NPK on growth and production of lettuce. The experiment was carried out in a greenhouse, in a completely randomized design in a 6 x 2 factorial scheme, with four replications, considering six levels of compost (0; 25; 50; 75; 100 and 125 g plant-1) and absence and presence fertilization with NPK. The evaluated parameters were number of total and commercial leaves, mass of fresh commercial and total aerial part, mass of commercial and total dry aerial part, dry root mass and total dry mass. There was an interaction between the drilocomposite and NPK fertilization for the evaluated parameters, except for root dry matter. The fertilization with NPK increased the growth and production of lettuce when there was no application of the compost. Likewise, that the levels of this fertilizer increased the growth and production of lettuce only in the absence of NPK. The application of drilocomposite increases the growth of lettuce plants and can replace fertilization with NPK.

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Does the resistance to glyphosate herbicide affect the competitive ability of ryegrass with soybean?

Planta Daninha ◽

10.1590/s0100-83582014000100021 ◽

2014 ◽

Vol 32 (1) ◽

pp. 189-196 ◽

Cited By ~ 2

Author(s):

C. Oliveira ◽

D. Agostinetto ◽

L. Vargas ◽

L.A. Ávila ◽

C.P. Tarouco

Keyword(s):

Statistical Analysis ◽

Leaf Area ◽

Intraspecific Competition ◽

Competitive Ability ◽

Dry Mass ◽

Replacement Series ◽

Soybean Crop ◽

Randomized Design ◽

Glyphosate Herbicide ◽

Completely Randomized Design

The objective this work was to investigate the competitive ability between resistant and susceptible ryegrass biotypes and of these with soybean crop. Four experiments were carried under greenhouse, in a completely randomized design with four replications, in 2011 and 2012. Treatments were arranged in additive series and replacement series assay. In each series, the proportions among ryegrass resistant and susceptible plants related to soybean were: 100:0, 75:25, 50:50, 25:75 e 0:100. Leaf area and shoot dry mass were evaluated. Competitiveness statistical analysis consisted in applying diagrams to the replacement series and alternative interpretations of the competitiveness indexes. The soybean crop had equivalent competitiveness to the susceptible ryegrass biotype and inferior to the resistant biotype, while the biotypes, both susceptible and resistant to glyphosate, present equivalent competitive ability. In general, the intraspecific competition is more harmful to ryegrass when in competition with soybean, while interspecific competition is predominant for culture.

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Safflower genotypes submitted to soil density levels

Comunicata Scientiae ◽

10.14295/cs.v9i2.2977 ◽

2018 ◽

Vol 9 (2) ◽

pp. 142-153

Author(s):

Edna Maria Bonfim-Silva ◽

Juliana Tertezinha Sasso Paludo ◽

Tonny José Araújo da Silva ◽

William Fenner ◽

Maurício Dutra Zanotto

Keyword(s):

Soil Structure ◽

Dry Mass ◽

Carthamus Tinctorius ◽

Soil Density ◽

Randomized Design ◽

Crop Development ◽

Number Of Leaves ◽

Agricultural Use ◽

The Mean ◽

Completely Randomized Design

It is essential to have knowledge of changes in soil structure, as a result of agricultural use and its relationship with crop development, especially those with potential for use in new regions, such as the cultivation of safflower (Carthamus tinctorius L.) in the Cerrado. In view of this dynamics, the objective was to evaluate the phytometric components of safflower genotypes submitted to levels of soil densities in Cerrado Oxisol. Ten safflower genotypes were then submitted to compaction (five densities: 1.0, 1, 2, 1.4, and 1.8 Mg m-3) in a completely randomized design with four replications under greenhouse conditions. The plots consisted of an overlap of three rings of polyvinylidene chloride of 0.01 m height each, and the treatments were applied in the intermediate layer. The phytometric components (plant height, number of leaves and stem diameter) and shoot dry mass of the crop were evaluated at 30, 60 and 90 days after sowing. There was no significant interaction between safflower genotypes and soil densities, with the effects being isolated for genotypes and/or densities when significant. For the phytometric characteristics evaluated, the genotypes PI250196, PI301049, PI305173, and PI305205 are more stable about the variations of soil density in comparison to the others. The phytometric components and dry mass of safflower shoot are impaired from the mean density of 1.2 Mg m-3.

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MANAGEMENT OF VOLUNTEER CASTOR BEAN IN THE GLYPHOSATE-RESISTANT SOYBEAN CROP

Planta Daninha ◽

10.1590/s0100-83582016340300015 ◽

2016 ◽

Vol 34 (3) ◽

pp. 545-553 ◽

Cited By ~ 2

Author(s):

V.S. ROCHA ◽

A.G.F. COSTA ◽

D.M.B.M. TROVÃO ◽

J.H. ZONTA ◽

V. SOFIATTI ◽

...

Keyword(s):

Leaf Area ◽

Plant Height ◽

Castor Bean ◽

Dry Mass ◽

Stem Diameter ◽

Root Volume ◽

Soybean Crop ◽

Randomized Design ◽

Chlorimuron Ethyl ◽

Completely Randomized Design

ABSTRACT The goal of this study was to evaluate the management of volunteer castor bean with herbicide applications used in pre and post-seeding of soybean crop resistant to glyphosate. Two experiments were conducted in a greenhouse in a completely randomized design with three replications. The first experiment corresponded to applications of desiccation with treatments: glyphosate (1,080 g ha-1); glyphosate + 2,4-D (1,080 + 670 g ha-1); glyphosate + carfentrazone-ethtyl (1,080 + 20 g ha-1); glyphosate + flumioxazin (1,080 + 25 g ha-1); glyphosate + saflufenacil (1,080 + 35 g ha-1); glyphosate + chlorimuron-ethyl (1,080 + 12.5 g ha-1); diuron + paraquat (300 + 600 g ha-1); and the control without application. In the second experiment, the treatments corresponded to doses of 0, 90, 180, 360, 720, 1,440, 2,880 and 5,760 g ha-1 of glyphosate for applications in post-emergence in soybean RR. The applications took place when the castor bean plant had four to six true leaves. The evaluations done in both experiments were: control and plant height at 7, 14 and 21 days after application (DAA); and stem diameter, leaf area, root volume, dry mass of shoots and roots at 21 DAA. The treatments with diuron + paraquat and glyphosate associated with 2,4-D, carfentrazoneethyl, flumioxazin or saflufenacil are more efficient for castor bean control in desiccation in pre-seeding of soybean. Glyphosate doses from 720 g ha-1 are effective to control castor bean in post-emergence of the glyphosate-resistant soybean crop.

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