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  • 1
    Online Resource
    Online Resource
    N Sources and Doses on Japonese Cucumber Yield and Nitrate Accumulation in Fruits in Greenhouse
    Canadian Center of Science and Education ; 2018
    In:  Journal of Agricultural Science Vol. 10, No. 10 ( 2018-09-15), p. 468-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 10, No. 10 ( 2018-09-15), p. 468-
    Abstract: Despite Japanese cucumber nutritional and commercial importance, few studies have been carried out with the nitrogen (N) fertilization of the crop, especially in greenhouse conditions. This study objective was to evaluate the Japanese cucumber yield and nitrate (NO3-) accumulation in the fruits in greenhouse as a function of the N sources and doses at Vi & ccedil;osa, Minas Gerais State, Brazil. The experiment was set in a randomized complete block design, arranged in a 2 & times; 5 factorial scheme, with two N sources (ammonium sulphate and ammonium nitrate) and five N doses (0; 75; 150; 300 and 600 kg ha-1), with four replicates. The number of fruits per plant, average fruit mass, fruits yield and NO3- accumulation in the fruits were evaluated. The maximum economic efficiency N doses for two N sources used was calculated according to the prices of the fertilizers and Japanese cucumber fruits practiced in 2010. There were no significant effects of N sources and of the interaction between N sources and N doses for the productive characteristics (number of fruits per plant, average fruit mass and fruits yield) of the Japanese cucumber. However, all the productive characteristics of the Japanese cucumber increased following a quadratic model as a function of the N doses. The maximum economic efficiency N doses for the fruits yield of Japanese cucumber were 398 kg ha-1 and 386 kg ha-1, resulting in fruits yield of 76.38 t ha-1 and 76.29 t ha-1, for the ammonium sulphate and ammonium nitrate, respectively. NO3- accumulation in Japanese cucumber fruits as a function of the N doses for two N sources evaluated was not verified.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v10n10p468
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2018
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  • 2
    Online Resource
    Online Resource
    Initial Growth of Yellow Passion Fruit Under Organic Fertilization
    Canadian Center of Science and Education ; 2018
    In:  Journal of Agricultural Science Vol. 10, No. 9 ( 2018-08-13), p. 191-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 10, No. 9 ( 2018-08-13), p. 191-
    Abstract: The production of yellow passion fruit seedlings is common among producers. Low cost techniques to maximize and reduce the cost of production with the application of cattle manure make the production of seedlings feasible. The objective of experiment was to evaluate different concentrations of cattle manure in substrate with and without liquid the biofertilizer in the production of yellow passion fruit seedlings. The experiment was carried out at the Universidade Estadual da Paraíba, Catolé do Rocha county, Paraíba state. The experimental design was completely randomized, in a 5 × 2 factorial scheme, with 5 repetitions end 3 plants per plot. The treatments consisted of five concentrations of cattle manure (0, 20, 40, 60, and 80% of the substrate volume), without and with the biofertilizer (10 mL plant-1). Sixty days after sowing, the following items were evaluated: plant height; number of leaves; root length; leaf area; leaf fresh mass; stem fresh mass; root fresh mass; aerial part fresh mass; total plant fresh mass; aerial part dry mass, and the Dickson quality index. The concentrations between 38 and 69% of composted cattle manure combined with the application of liquid biofertilizer increased the initial growth of yellow passion fruit plants, making its use feasible in the production of seedlings.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v10n9p191
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2018
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  • 3
    Online Resource
    Online Resource
    Morphological Characterization of Cephaleuros virescens Occurring in Mango Trees
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 11 ( 2019-07-31), p. 156-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 11 ( 2019-07-31), p. 156-
    Abstract: The objective of this work was to accomplish the micromorphological characterization of the causal agent of the algal spot in & lsquo;Amrapali & rsquo; mango trees. Therefore, & lsquo;Amrapali & rsquo; mango leaves exhibiting symptoms of algal spots were used for making microscope slides, on which the pathogen somatic and reproductive structures were measured. The dimensions obtained for sporangiophores and sporangia were 245.5-545.6 & times; 10.5-19.1 & mu;m and 21.4-34.2 & times; 16.3-24.7 & mu;m, respectively. Descriptions based on symptoms and micromorphology indicated that the algae are Cephaleuros virescens, since this morphological data corroborates with literature descriptions. Besides, the algae had already identified by DNA sequencing as C. virescens.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n11p156
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
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  • 4
    Online Resource
    Online Resource
    Evaluation of the Addition of Urea or Calcium Oxide (CaO) on the Recovery of Dry Matter of the By-Product of Sweet Corn Silage
    Canadian Center of Science and Education ; 2017
    In:  Journal of Agricultural Science Vol. 9, No. 9 ( 2017-08-15), p. 141-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 9, No. 9 ( 2017-08-15), p. 141-
    Abstract: The objective of this study was to evaluate the effects of the addition of different percentages of urea or calcium oxide (CaO) on the fermentative characteristics and chemical composition of the by-product of sweet corn silage, without whole kernel corn. The experimental design was completely randomized in a 2 × 5 factorial scheme, with two additives (CaO or urea) and five inclusion levels (0, 0.5, 1.0, 1.5, and 2.0% in natural matter of by-product of sweet corn silage). There was interaction between the type of additives and addition levels (CaO or urea) for pH values (P 〈 0.05). The mean pH values ranged from 3.40 to 5.36 in the additive silage. For effluent production, the additive type interaction and addition levels were significant (P 〈 0.05). The addition of CaO independent of the level used was not effective in reducing dry matter (DM) losses during ensilage. The total losses of DM presented a significant increase with the levels of addition of CaO, varying from 91 to 177% in relation to the control silage. The addition of urea to all levels had a satisfactory effect on the total loss of DM, ranging from 38 to 69% improvement in the reduction in relation to the control silage. The additive CaO was not efficient in reducing the fermentation losses and preserving the silage. However, urea was efficient in the recovery of DM in the ensilage process.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v9n9p141
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2017
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  • 5
    Online Resource
    Online Resource
    Physical Attributes of the Soil and Maize Productivity Under an Intercrop System
    Canadian Center of Science and Education ; 2018
    In:  Journal of Agricultural Science Vol. 10, No. 12 ( 2018-11-15), p. 358-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 10, No. 12 ( 2018-11-15), p. 358-
    Abstract: The intensive use of agricultural areas for farming, together with inadequate management, can cause soil degradation and promote a low-quality environment for crops; An intercrop system of maize and forage can therefore be an alternative to existing production systems. The aim of this study was to identify the effect of intercropping maize with forage on the physical attributes of the soil and on productivity in maize, as a function of the sowing season and different forages, in the northeastern region of Brazil. A trial intercrop of maize with three forages (Brachiaria brizantha, Panicum maximum & lsquo;Mombasa & rsquo;, and Crotalaria spectabilis a.) was planted at two different times: phase 1-forage sown between the rows of maize, mixed with the basal dressing; and phase 2-forage sown between the rows, at the V4 stage in maize; in addition to maize with no intercrop (control). The trial was carried out in a randomised block design, with four replications. Forage Mombasa inserted in phase 1 (1) and phase (2) of sowing favored higher values of macroporosity in the layers 0.0-0.10 m and 0.10-0.20 m respectively. For the mass of 1000 grains and grain yield, there were no significant differences between the treatments when compared to the exclusive corn. It was concluded that the maize-forage intercrop promotes changes in the physical attributes of the soil (macroporosity, total porosity and density), and that maize productivity is not affected by the intercrop system.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v10n12p358
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2018
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  • 6
    Online Resource
    Online Resource
    Comparison of Methodologies to Determine the Optimum Plot Size for Okra Seedlings Evaluation
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 5 ( 2019-04-15), p. 388-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 5 ( 2019-04-15), p. 388-
    Abstract: The production of okra using seedlings is a practice increasingly used by farmers. However, this system still lacks further research involving substrates, tray types, cell volume, pest control and disease. For this it is important to determine the optimum size of the plots, in order to reduce the experimental errors and the expenses with the experiment. The objective of this work was to determine the optimum plot size for experiments involving okra seedlings produced in Styrofoam trays of 128 cells using different methods. The methods were the maximum curvature, the maximum curvature with bootstrap simulation and the maximum curvature of the coefficient of variation. The evaluated characteristics were aerial part height, stem diameter, aerial dry matter, root dry matter, total dry matter and quality of seedlings as measured by Dickson quality index. The results showed that the optimum plot size is different between the evaluated characteristics and for characteristics there is no significant difference in the optimum plot size between the three different methods. The optimum size for evaluating okra seedlings produced in Styrofoam trays of 128 cells is 10 seedlings per plot and is indicated the use of the maximum curvature method using a bootstrap simulation.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n5p388
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
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  • 7
    Online Resource
    Online Resource
    Multivariate Analysis in Corn Cultivars Productivity Submitted to Fertilizations and Row Spacing
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 7 ( 2019-05-31), p. 96-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 7 ( 2019-05-31), p. 96-
    Abstract: The corn crop is important in various contexts of Brazilian agricultural production, both with respect to economic and social factors. The objective was to verify, through multivariate methods, the productive performance of two corn cultivars as a function of three types of fertilizations and two row spacing, identifying the correlation between the variables and the grouping between the evaluated treatments. The experiment was carried out at Experimental Farm Rafael Fernandes, Mossor & oacute;, Brazil. It was adopted a randomized block design at 3 & times; 2 & times; 2 factorial experiment with four replications, the treatments consisted of three fertilizations (OF: Organic Fertilization; OMF: Organomineral Fertilization and MF: Mineral Fertilization), two cultivars of corn (Bras 3010 and Potiguar) and two row spacing (80 cm and 50 cm). The highest productivity was found with the use of organic fertilization, in the cultivar Potiguar, in the row spacing of 80 cm. The final population, productivity and the mass of 1000 grains were the components that had the most effect in the evaluation of the data set. Each evaluated cultivar responded differently to the fertilizations and spacing evaluated. The agreement between the results of the cluster analysis and the main component analysis with the analysis of variance shows the adequacy of the multivariate statistical techniques used in this research.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n7p96
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
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  • 8
    Online Resource
    Online Resource
    Establishment of Sufficiency Ranges to Determine the Nutritional Status of ‘Gigante’ Forage Cactus Pear—Micronutrients
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 18 ( 2019-11-15), p. 222-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 18 ( 2019-11-15), p. 222-
    Abstract: Micronutrient sufficiency ranges are of great importance in crop nutritional diagnosing for improved fertilizer recommendations under field conditions. The objective of this paper was establishing the micronutrients ranges in the cladodes for the evaluation of the nutritional status of & lsquo;Gigante & rsquo; forage cactus pear. Micronutrients contents in cladodes and dry matter yield of 72 plots were used. The experiment was composed of four cattle manure rates (0, 30, 60, and 90 Mg ha-1 year-1), three spacings (l.00 & times; 0.50, 2.00 & times; 0.25, and 3.00 & times; 1.00 & times; 0.25 m), and two production cycles, in a 4 & times; 3 & times; 2 factorial plan, designed in randomized blocks, with three replicates. Sufficiency ranges of plots with dry matter & ge; 19.93 Mg ha-1 cycle-1 were determined as well as the mathematical chance for plots with dry matter & ge; 23.75 Mg ha-1 cycle-1 and the critical level. The sufficiency range, critical level and mathematical chance are, respectively, for each micronutrient, in mg kg-1: B, 22.3-32.7; 23.7; 20.36-27.94; Cu, 2.0-3.7; 1.6; 1.8-2.8; Fe, 61.1-126.6; 62.0; 35.8-85.3; Mn, 260.0-507.7; 111.0; 54.8-252.2; Zn, 34.5-57.8; 30.3; 19.7-48.5; and, Na, 29.8-56.2; 19.4; 26.6-42.7. For B, Zn, and Na, the sufficiency range, mathematical chance, and the critical level are adequate; for Cu, Fe, and Mn, the critical level and mathematical chance are more adequate for nutritional evaluation of `Gigante` forage cactus pear, associated with dry matter yield ranging from 21.8 to 31.2 Mg ha-1 cycle-1.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n18p222
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
    detail.hit.zdb_id: 2501913-2
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  • 9
    Online Resource
    Online Resource
    Lettuce Growth in Different Pot Volumes and Irrigation Frequencies Under Saline Stress
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 3 ( 2019-02-15), p. 494-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 3 ( 2019-02-15), p. 494-
    Abstract: This study aimed to evaluate lettuce production in different pot volumes and different irrigation frequency under saline stress. The experiment was carried out at the Department of Environmental and Technological Sciences of the Federal Rural University of the Semi-Arid, in Mossor & oacute;, RN, Brazil. Randomized block experimental design was used in factorial scheme of 2 & times; 3 & times; 3, with 3 replicates. Treatments were consisted of 2 water & rsquo;s salinity levels (0.5 and 2.0 dS m-1), 3 frequencies of irrigation (6, 9, and 12 daily events), and 3 different pots (0.5, 1.0, and 3.0 L). Data from parameters evaluated at harvest were submitted to variance analysis and means were compared. We verified that when the lower saline water (0.5 dS m-1) was used lettuce production increased when cultivated in pots of 3.0 L and submitted to 6 daily events of irrigation. When 3.0 dS m-1 water was used the best results were obtained in 0.5 L and nine daily events of irrigation. The combination of 0.5 L pot and six or nine daily events of irrigation better inhibited the damaging effects of salinity.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n3p494
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
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  • 10
    Online Resource
    Online Resource
    Estimation Leaf Area by Composite Leaves of Canavalia rosea Seedlings Through Linear Dimensions From Last Leaflet
    Canadian Center of Science and Education ; 2019
    In:  Journal of Agricultural Science Vol. 11, No. 9 ( 2019-06-30), p. 299-
    Details
    In: Journal of Agricultural Science, Canadian Center of Science and Education, Vol. 11, No. 9 ( 2019-06-30), p. 299-
    Abstract: The objective of this work was to propose models of equations from measurements of the linear dimensions of the last leaflet for the estimation of the leaf area of the composite leaves of Canavalia rosea. For this purpose, 441 composite leaves of 198 seedlings were used, 45 days after sowing, produced in nursery and belonging to the Federal University of Esp & iacute;rito Santo, Campus S & atilde;o Mateus, located in the municipality of S & atilde;o Mateus, North of the State of Esp & iacute;rito Santo, Brazil. The length (L) along the main midrib and the maximum leaf width (W) of the last leaflet of each composite leaf, as well as the leaf area of all leaflets, were measured. Subsequently, it was determined the product of the multiplication of the length with the width (LW) and leaf area observed (OLA) from the sum of leaf area of leaflets in front of these measures were adjusted linear and non-linear equations of linear first degree, quadratic and power models, where, OLA was used as a dependent variable in function of L, W and LW as independent variable. Based on the models tested, we obtained equations for the estimated leaf area (ELA). The mean values of ELA and OLA were compared by Student & #39;s t test 5% probability. The mean absolute error (MAE), the root mean square error (RMSE) and the Willmott d index, were determined as criteria for validation. The best adjusted equation was chosen through the non-significant values in the comparison of the means of ELA and OLA, values of MAE and RMSE closer to zero, value of the index d near the unitary and higher values of R2. Thus, the leaf area of the composite leaf of C. rosea seedlings can be estimated by the power model represented by equation ELA = 2.2951 (LW)0.9474 quickly, easily and non-destructively.
    Type of Medium: Online Resource
    ISSN: 1916-9760 , 1916-9752
    URL: Article
    DOI: 10.5539/jas.v11n9p299
    Language: Unknown
    Publisher: Canadian Center of Science and Education
    Publication Date: 2019
    detail.hit.zdb_id: 2501913-2
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