Open Access Original Research Article

Water and Pulp Quality of Green Coconut Produced with Mulching and Irrigation Frequency

Kátia Gomes da Silva, Franciscleudo Bezerra da Costa, Yasmin Lima Brasil, Álvaro Gustavo Ferreira da Silva, Gilvan Oliveira Pordeus, Valéria Maria Medeiros, Ana Marinho do Nascimento, Jéssica Leite da Silva, Márcio Santos da Silva, Arthur Xavier Mesquita de Queiroga, Giuliana Naiara Barros Sales

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2018/44284

Objective: The objective was to evaluate the postharvest quality of the water and the green coconut pulp.

Experimental Design: The experiment was conducted in a random block design, corresponding to the use of treatments with and without mulching, combined with five irrigation frequencies.

Place and Duration of the Study: The experiment was held at the Várzeas de Sousa project, located between the municipalities of Sousa and Aparecida, in the hinterlands mesoregion of Paraíba state, where it was taken to the Agrifood Science and Technology Center of the Federal University of Campina Grande, Pombal campus, in October 11, 2017.

Methodology: The testing was conducted in random blocks, in a 2 x 5 factorial scheme, (factor 1: treatments with and without mulch and factor 2: irrigation frequency (TR1: daily irrigation; TR2: irrigation every 2 days; TR3: irrigation every 3 days; TR4: irrigation every 4 days; andTR5: irrigation every 5 days).

Results: Treatments didn’t influence the physical-chemical characteristics of green coconut water or pulp, being the variables within the current standards and norms. 

Conclusion: Use of mulch enabled the coconut to obtain higher ratio values SS/TA, regardless of irrigation interval, very important from a commercial point of view and acceptance of water. In the pulp, greater prominence was observed for the phenolic compounds of the fruits treated with the use of mulch and independent of the irrigation shift.

Open Access Original Research Article

Antioxidant Capacity in Leaf and Root Tissues of Prunus spp under Flooding

Elizete Beatriz Radmann, Elsa Kuhn Klumb, Sidnei Deuner, Valmor João Bianchi

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2018/43650

The present study aims to evaluate the antioxidant responses and cellular damage in 'América' Japanese Plum and 'GxN-9' peach rootstock plants under soil flooding stress. Two-year-old plants propagated by cuttings were transplanted to pots (4 L) and two months after planting; they were submitted to different flood periods (2; 4 and 6 days); each period being composed of two treatments; control (irrigated daily to field capacity) and water stress (soil flooding). After each stress period; cells damage was evaluated by measuring lipid peroxidation (MDA) and hydrogen peroxide (H2O2); and the specific activity of the antioxidant enzymes Superoxide Dismutase (SOD); Catalase (CAT) and Ascorbate Peroxidase (APX) from 200 mg of leaf and root tissues. Under stressed conditions; an increase in the activity of the antioxidant enzymes and the levels of H2O2 and MDA in both cultivars and tissues were observed. Leaves showed the highest cellular damage when compared with roots; which suggests the higher activity of photosynthetic and photorespiratory metabolism. The values of MDA and H2O2 were lower in America when compared to GxN-9; indicating that the antioxidant system of the Japanese Plum cultivar is more efficient as compared to the peach rootstock under soil flood conditions.

Open Access Original Research Article

Influence of Different Coatings on Quality and Shelf-Life of Guava under Different Storage Temperature

Albert Einstein Mathias de Medeiros Teodosio, Elny Alves Onias, Luana Muniz de Oliveira, Marília Hortência Batista Silva Rodrigues, Jescika Alves Ribeiro, Thaís Batista Queiroga, Evandro Franklin de Mesquita, Railene Herica Carlos Rocha Araújo, Bárbara Genilze Figueiredo Lima Santos

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2018/43852

The culture of guava tree (Psidium guajava L.) is a cultivation alternative to the Brazilian semiarid region, as well as a source of income for the small farmer. However, after the crop, fruits face a fast deterioration process, leading to the need for methodologies to delay ripening and consequently reduce losses. In this context, this project aimed to evaluate influences of the application of edible coating based on starch, associated arrowroot, or not to the pomegranate oil in the conservation in post harvest of the guava tree 'Paluma'. The experiment was designed to be entirely randomised, in a 2 x 4 factorial outline, two storage temperatures (20 ± 2°C for 12 days and 10 ± 2°C for 20 days, both with 85 ± 5% UR) and four types of coatings (T1: without application; T2: 0.3% pomegranate oil; T3: arrowroot until 2% and T4: arrowroot to 2% + 0.3% pomegranate oil, with five repetitions of two fruits). The use of the base arrowroot starch in 2% was shown to be efficient in the control of the ripening of the guavas stored in different temperatures. The coating of arrowroot starch to 2% + 0,3% of pomegranate oil, promoted more the reduction of the breathing tax of guavas, providing the maintenance of the shelf life post harvest of the fruits in both tested temperatures. Moreover, the coating of starch of araruta 2% + 0.3% of pomegranate oil provided a better shelf life in guavas for 20 days of storage the temperature of 10 ± 2°C with 85 ± 5% UR.

Open Access Original Research Article

Physiology and Postharvest Quality of Palm Sprouts (Opuntia fícus-indica) Harvested at Different Times

Emmanuel Moreira Pereira, Franciscleudo Bezerra da Costa, Anderson dos Santos Formiga, Giuliana Naiara Barros Sales, José Ricardo Tavares de Albuquerque, Thayse Cavalcante da Rocha, Verlânia Fabíola de Sousa Farias, Pahlevi Augusto de Souza

Journal of Experimental Agriculture International, Page 1-8
DOI: 10.9734/JEAI/2018/44248

Objective: The study aims to evaluate the physiological and postharvest quality characteristics of the palm (Opuntia fícus-indica) sprouts harvested at different times.

Experimental Design: The experiment was laid out in a completely randomised design, consisting of three palm cultivars (Gigante, Clone IPA 20 and Redonda) and eight harvest times (3, 6, 9, 12, 15, 18, 21 and 24 hours).

Place and Duration of the Study: Experiment was carried out in the experimental area of the Agri-Food Science and Technology Center of the Federal University of Campina Grande, Pombal, Paraíba, from November to January 2016.

Methodology: The experiment was carried out in a completely randomised design (CRD), in a factorial scheme of 8x3x3, having 8 harvest times (3, 6, 9, 12, 15, 18, 21 and 24 hours), 3 cactus cultivars ("Gigante", "Clone IPA 20" and “Redonda") and 3 replicates, belonging to the family Opuntia.

Results: Sprouts of "Gigante" presented the highest values of titratable acidity, ascorbic acid and chlorophyll. The average titration value of 0.63 (% malic acid), 11.2 mg ascorbic acid , and 1320.8 mg chlorophyll 100-1 of fresh mass, were observed in 3, 6 and 9th  hours of harvest. After these periods, a significant loss of these compounds were recorded.

Conclusion: ‘Gigante’ cultivar presented the best performance for the evaluated parameters. Palm sprouts showed a high values of titratable acidity, ascorbic acid, chlorophyll and phenolic compounds. Different harvesting schedules influenced the quality of these parameters. Based on the physiological characteristics evaluated, it has been revealed that the best harvest periods are 3, 6 and 9 hours.

Open Access Original Research Article

Biometric Characterisation and Physiological Quality of Seeds of Hymenaea courbaril L.

Ana Carolina Pinguelli Ristau, Maria Soraia Fortado Vera Cruz, Carlos Augusto Rocha De Moraes Rego, Hannah Braz, Shirlene Souza Oliveira, Bruna Penha Costa, Marlene de Matos Malavasi, Ubirajara Contro Malavasi, Cláudio Yuji Tsutsumi

Journal of Experimental Agriculture International, Page 1-9
DOI: 10.9734/JEAI/2018/43824

Aims: The objective of this work was to verify the influence of seed size on germination and vigour of seeds and seedlings of Hymenaea courbaril L.

Study Design: The experimental design was completely randomised.

Place and Duration of Study: The present work was carried out in the Laboratory of seeds of the State University of the West the Paraná, Brazil, between January to July, 2018.

Methodology: The seeds were obtained in the Marialva region, Paraná, classified according to the biometric characteristics, in accordance with the range of values of seed length, in small, medium and large to later be mechanically scarified and immersed in water for 48 hours. The study evaluated the biometric characteristics, moisture content, germination, seed vigour and seedling development.

Results: In the present study, the size of the seeds reflected effects on the physiological quality of the seeds, mainly in the parameters related to the performance of seedlings.

Conclusion: The seedlings evaluated from medium and large seeds showed better performance in the majority of parameters. In addition, the use of large seeds is recommended, because they have a higher percentage of seedling emergence and the best quality.