Open Access Original Research Article

Performance of Corn Cultivars in Different Row Spacing and Types of Fertilizations

Anailson de Sousa Alves, Suedêmio de Lima Silva, Tayd Dayvison Custodio Peixoto, Paulo Roberto de Souza Silveira, Joaquim Odilon Pereira, Francisco Aécio de Lima Pereira

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2019/46528

Aims: This study aimed to evaluate the productivity and production components of two cultivars of corn for different types of fertilization and row spacings on irrigated farming system.

Study Design: It was adopted a randomized block design at 3 x 2 x 2 factorial experiment with four replications, the treatments consisted of three fertilization (OF - Organic Fertilization; OMF – Organomineral Fertilization and MF - Mineral Fertilization), two cultivars of corn (Bras 3010 and Potiguar) and two row spacings (80 cm and 50 cm).

Place and Duration of Study: The experiment was carried out from June to October 2013, at Fazenda Experimental Rafael Fernandes, in the community of Alagoinha, belonging to the  Federal Rural University of Semi-Arido (UFERSA), lying 20 km from the city of Mossoró, Rio Grande do Norte, Brazil.

Methodology: The organic fertilization (OF) was performed as minimum recommendation corresponding to 10 t ha-1 of bovine manure. The organomineral fertilization (OMF) was made by applying 50% of the recommended amount of manure recommended in organic fertilization (OF), 5 t ha-1, and 50% of the recommendation of mineral fertilizer (MF). The mineral fertilization (MF) was performed based on the parameters observed in the soil analysis and recommendation for the corn crop in the region due to an expected maximum productivity.

Results: The study showed that the mineral fertilization (MF) provided an increase in the productivity components of both evaluated, the hybrid variety Bras 3010 and Potiguar. The OMF did not show significant differences regarding the MF in production components of corn cultivars evaluated.

Conclusion: Components of production and productivity of corn cultivars were incremented when using the spacing of 80 cm between rows. The variety Potiguar corn had higher grain productivity compared with the Bras 3010 hybrid when used the organic fertilization.

Open Access Original Research Article

Evaluation of the Impact of Normative Instruction No. 48 on the Production of Citrus Seedlings: A Case Study in Santa Luzia de Indua, Captain Poco-PA-Brazil

Luane Laíse Oliveira Ribeiro, Letícia do Socorro Cunha, Maria Eunice Lima Rocha, Lucila Elizabeth Fragoso Monfort, Wanderson Cunha Pereira

Journal of Experimental Agriculture International, Page 1-8
DOI: 10.9734/JEAI/2019/46247

Capitão Poço is considered the land of orange, having citriculture as the main source of income of producers in the municipality. Among the citrus production, the production phases is, the production of seedlings, which is heavily developed and marketed in the community of Santa Luzia of Induá, rural area of the city. The research objective consisted of accomplishing a survey of the production and marketing of citrus seedlings as in paragraph 48, in the community of Santa Luzia of Induá, municipality of Capitão Poço/Pará. The study was carriedout based on structured questionnaires founded in 48, where 50 producers of seedlings assets were interviewed at random. The data were tabulated in an electronic spreadsheet Microsoft Excel 2010® and 2013® for analysis and results presented in charts and tables formats. The study found that a large proportion of small and medium-sized producers had little knowledge of the regulations, but the large nurseries had reasonable knowledge. Because of this, and because of lack of information, understanding and correct interpretation of the Normative Instruction, most of the producers were not adapting to the imposed legislation, being thus afraid of changing the way of cultivation, since they have been working for a long time with the production of seedlings in the soil.

Open Access Original Research Article

Growth and Quality of Papaya 'Tainung 01' Seedlings Submitted to Different Irrigation Depths

Robson Prucoli Posse, Francielly Valani, Vinicius de Souza Oliveira, Roberto Kirmse, Regiane Lima Partelli, Gabriel Sossai Pancieri, Geilson Silva Costa

Journal of Experimental Agriculture International, Page 1-11
DOI: 10.9734/JEAI/2019/46331

Performing an adequate irrigation management for the production of papaya seedlings is essential to obtain plants that express all their genetic potential. For this reason, this work aimed to evaluate the effect of different irrigation depths on the growth and quality of papaya type 'Tainung 01' seedlings. The study took place at the Federal Institute of Espírito Santo, Campus Itapina, located in the in Colatina, in the Northwest region of the State of Espírito Santo, Brazil. The experimental design was completely randomized with 25 repetitions for each treatment. The treatments consisted on the application of six irrigation depths: 4, 6, 8, 10, 12 and 14 mm d-1. The seedlings were evaluated at 65 days after planting for the following morphological characteristics: plant height, stem diameter, number of leaves, leaf area, dry mass of the aerial part, dry mass of the root system, total dry mass and Dickson quality index. The irrigation depth of 9.16 mm d-1 had a higher Dickson quality index attesting a higher quality of seedlings, being the most suitable for the production of papaya 'Tainung 01' seedlings.

Open Access Original Research Article

Postharvest Pepper Conservation with Different Storage Strategies

Dalva Paulus, Gilmar Antônio Nava, Ivan Carlos Zorzzi, Raquel Valmorbida

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2019/46328

Aims: The present study was to assess the postharvest quality of Capsicum annum peppers subjected to different concentrations of salicylic acid at room temperature, and using of different kinds of treatments like as plastic films, refrigerated, with different storage periods.

Study Design: For this, two experiments were conducted: Experiment I – salicylic acid concentrations (0; 0.5; 1.0 and 2.0%) and three storage periods (7, 14 and 21 days) were tested; Experiment II – modified atmospheres were used, with low-density polyethylene (LDPE) films with five thickness (20, 40, 60, 80 and 100 µm), polyvinyl chloride (PVC) of 10 µm and control (without film), being stored under refrigeration at 9.5 ± 0.5°C and 90 ± 2% of relative humidity, kept for 7, 14, 21 and 28 days.

Place and Duration of Study: The experiments were conducted in the Horticulture Laboratory of the Federal University of Technology of Paraná (UTFPR), Paraná – Brazil in the period between April  to July 2016. 

Methodology: Physiological indicators, physical and chemical characteristics such as soluble solids content (SS,°Brix), titratable acidity (TA), SS/TA ratio, number of deteriorated fruits, fresh fruit weight loss and individual background color score of the epidermis of each fruit were analyzed.

Results: Experiment I - The soluble solids content was influenced by SA concentrations, with quadratic adjustment for 0; 0.5; 1.0 and 1.5% and linear for 2.0% of salicylic acid. For titratable acidity (TA), the SA concentrations of 0; 0.5 and 1% had quadratic adjustment. Experiment II - The control treatment showed a lower proportion of deteriorated fruits (0.3%), not differing from LDPE plastic films. The treatments with LDPE allowed a reduction in the amount of deteriorated fruits up to 14 days of storage, when compared to PVC, which had higher percentage of deteriorated fruits (12.84%).

Conclusion: It was concluded that 2.0% salicylic acid allowed the conservation of pepper for up to 28 days. Under room temperature and humidity or under conventional refrigeration, the fruits maintain good commercial quality for up to seven days. LDPE plastic films reduce fresh weight loss and do not increase fruit decay by rotting, prolonging in 21 days the storage period of the fruits.

Open Access Original Research Article

Bark and Fruit Extracts Anadenanthera colubrina (Vell.), Mimosa tenuiflora (Willd.) and Acacia mearnsii (Wild.) Species

Jordânia X. Medeiros, Leandro Calegari, Girlânio H. Silva, João A. Tanajura, Rafael L. Braz

Journal of Experimental Agriculture International, Page 1-7
DOI: 10.9734/JEAI/2019/46500

The aim of this study was to quantify extracts from the bark and green fruits of A. colubrina and M. tenuiflora, compared to A. mearnsii bark using the formaldehyde method. Ten M. tenuiflora and ten A. colubrina trees were selected to collect the studied material and five A. mearnsii individuals. Moisture content, total solids, Stiasny index and condensed tannin content were analyzed. The results were compared by Tukey test at 5% probability. In relation to the Stiasny index, the species A. mearnsii and M. tenuiflora did not differ statistically, with averages of 68.3 and 62.6%, respectively. The content of condensed tannins found in A. colubrina fruits, did not differ statistically from the content of the bark of the same species, corroborates with data referenced in the literature in research with this species that is traditionally exploited in the Northeast Region of Brazil by the tannery industry. The M. tenuiflora and A. colubrina species present potential for the production of tannic extracts, although tannin contents are inferior to those obtained for A. mearnsii. In addition, due to the abundance in the Brazilian semiarid region, the M. tenuiflora has potential for exploitation to obtain tannins.