Open Access Original Research Article

Postharvest Quality during Refrigerated Storage of ‘Nadorcott’ Mandarin

I. C. Nardello, R. F. F. Cantillano, M. Seifert, P. C. Mello- Farias, M. B. Malgarim, R. P. de Oliveira

Journal of Experimental Agriculture International, Page 1-10
DOI: 10.9734/JEAI/2017/38520

Aims: The aim of this article was to study the suitable storage duration and temperature of Nadorcott mandarin.

Study Design: The experimental design used was the completely randomized design, with two factors: two storage temperatures and four storage durations, with four repetitions for each period, and each repetition counting with 15 fruits.

Place and Duration of Study: The mandarin cv. Nadorcott used were from Rosário do Sul city, Rio Grande do Sul (RS) State, Brazil. Fruits were harvested in commercial maturation, and transported to the Food and Postharvest Laboratory, Embrapa Temperate Climate, Pelotas-RS.

Methodology: Mandarins were stored during 15, 30, 45, and 60 days at refrigerated temperatures of 4°C and 8°C, with two days at 20°C in order to simulate market conditions. The parameters analyzed were: total soluble solids content; titratable acidity; the relationship between total soluble solids and titratable acidity; firmness; longitudinal diameter; mass loss; juice yield; skin color; rotting percentage; antioxidant activity; total carotenoids; total phenolic compounds and vitamin C.

Results: Maturity index of 9.97 and 11.52 to 4°C and 8°C, respectively, was obtained. The biggest loss of mass (12.08%) and rotting (18.33%) occurred at 60 days of storage at 8°C. The total phenol content (60.02 mg of gallic/100 g of fresh fruit) and the vitamin C concentration (15.7 mg of ascorbic acid/100 g of fresh fruit) had the highest reduction at 60 days of storage at 8°C.

Conclusion: The ‘Nadorcott’ mandarin maintained postharvest quality characteristics when stored up to 45 days at 4°C, with relative humidity between 90-95%, and commercialized for 2 days at 20°C.

Open Access Original Research Article

Evaluation of Cowpea (Vigna unguiculata L.) Genotypes’ Growth and Yield Performance and Resistance to the Cowpea Seed Beetle, Callosobruchus maculatus F.

Bashiru Adams, Enoch Adjei Osekre, Stephen Amoah

Journal of Experimental Agriculture International, Page 1-9
DOI: 10.9734/JEAI/2017/38712

The search for resistant cowpea (Vigna unguiculata (L.)) Walp. genotypes against the cowpea seed beetle Callosobruchus maculatus F. (Coleoptera: Chrysomelidae) in order to minimize the use of synthetic insecticides due to problems associated with their use led to field and laboratory experiments to evaluate the growth and yield of 10 cowpea genotypes on the field and their responses to the insect in the laboratory. A randomized complete block design with three replications and a completely randomized design with four replications were used for the field and laboratory experiments, respectively. The study was undertaken at Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana from the period August 2016 to February 2017. The cowpea genotypes were Asontem, Sanzisanbili, Hans Adua, Zamzam, Nketewade, Videza, IT97K-819-132, Agyenkwa, Bengah and Bianga. The results of the field experiment showed that there were significant differences among the cowpea genotypes in all the growth and yield parameters evaluated. Asontem, Hans Adua, Zamzam, Videza and Bianga produced significantly (P< .05) taller plants at maturity. Nketewade produced the highest grain yield (466.1 kgha-1) whiles Sanzisanbili, Hans Adua, Zamzam, Videza, Agyenkwa and Bengah recorded the lowest grain yields. The grain yield ranged from 75.4 to 466.1 kgha-1. Results from the laboratory experiment showed that Videza supported the least number of F1 progeny, prolonged the development period of C. maculatus and suffered the least storage weight loss. Videza was thus the only genotype that showed moderate resistance to C. maculatus whiles the other genotypes were either susceptible or highly susceptible.

Open Access Original Research Article

In-row Vegetation Cover and Its Effects on ‘Tannat’ Canopy and Grapes in the Campanha Region of Rio Grande do Sul State

C. S. P. Lamela, G. P. Zandona, V. B. Costa, M. Ferrer, M. B. Malgarim, P. C. Mello Farias, F. G. Herter

Journal of Experimental Agriculture International, Page 1-13
DOI: 10.9734/JEAI/2017/37857

Aims: The objective of this study was to evaluate the use of a permanent resident in-row cover crop and its effects on canopy and grapes of ‘Tannat’ vineyard.

Study Design: The experiment was a randomized block with four replications. The treatment factor was permanent resident vegetation cover with two levels, presence of in-row vegetation cover (VC) and vegetation cover absence, with herbicide usage (HB). 

Place and Duration of Study: Experiment was carried out in a commercial vineyard using a vertical shoot position (VSP) system on Eutrophic Red-Yellow Latosol soil in the city of Bagé, in 2014/2015 and 2015/2016.

Methodology: Plant technical, physicochemical and polyphenolic potential parameters related to branch behavior and grape composition were evaluated.

Results: The use of permanent resident in-row vegetation cover slightly decreased its performance during the 2014/2015 crop, but raised quality parameters such as reducing sugars, total and extractable anthocyanins and reduced the potassium content in grapes. During 2015/2016 crop, there were no yield differences between VC and HB, and yet the permanent resident in-row vegetation cover raised the quality parameters in relation to 2014 crop.

Conclusion: This technique, where is particularly used in deep soils of the Campanha region, promotes sustainability in soil conservation and also can reduce herbicides costs, green pruning, and, mainly, thinning usage when aiming to increase the quality.

Open Access Original Research Article

Agro-morphological Diversity of Six Peanut (Arachis hypogaea L.) Breeding Lines from Three Geographical Areas

Fidele Bawomon Neya, Kadidia Koita, Sanon Elise, Bertin M’bi M’bi Zagre, Abel Tounwensida Nana, Mark D. Burow, Philippe Sankara

Journal of Experimental Agriculture International, Page 1-12
DOI: 10.9734/JEAI/2017/37686

Aims: To improve peanut (Arachis hypogaea L.) performance, morphological traits of agronomic importance were assessed for genetic diversity of six breeding lines. These lines are from different geographical origins Burkina Faso, Senegal and the USA.

Study Design: The experimental was performed as a Fisher randomized complete block with three replications.

Place and Duration of Study: The morphological experiment was conducted at the research station of Rural Development Institute (IDR) at Gampêla in the East-Central area of ​​Burkina Faso during the cropping season of 2015-2016.

Methodology: Twenty character traits (qualitative and quantitative morphological parameters and resistance components) described in the peanut descriptor were used for characterization.

Results: Analysis of variance revealed a wide variability between these six lines for different traits of characters used. Principal Component Analysis (PCA) and the hierarchical cluster analysis (HCA) indicate that this variability is structured into three groups. Group I includes early breeding lines, productive and susceptible to leaf spot (early and late) SH470P, CN94C and (AS) the second group includes a single line resistant and late GM656; and the third group include resistant and latest maturing breeding lines, NAMA and PC79-79.

Conclusion: GM656 and CN94C could be potential parents in the breeding program to combine resistance with early and high yield potential.

Molecular characterization of these breeding lines will better distinguish these and understand the genetic control of different traits; this will allow an improvement of this important crop for performance and leaf spot resistance.

Open Access Original Research Article

The Effect of Different Doses of Calcium Nitrate Applications on Some Phytonutrient Element Contents of Leafy Parsley (Petroselinum crispum (Mill.)) Plant

Sevinc Adiloglu, Funda Eryilmaz Acikgoz, Yusuf Solmaz, Aydin Adiloglu, M. Rustu Karaman

Journal of Experimental Agriculture International, Page 1-6
DOI: 10.9734/JEAI/2017/37891

Leafy parsley (Petroselinum crispum (Mill)) plant is an important source of Ca for human and 100 grams of leafy parsley plant provides 200-300 grams of Ca. This research was conducted to determine the different doses of calcium nitrate application on some macro and micro phytonutrient element contents of leafy parsley (Petroselinum crispum (Mill)) plant. For this purpose, the experiment followed randomized block experimental design with three replications in greenhouse conditions. 1.5 gm-2 plant seeds sowed for each parcel. Four calcium nitrate application doses (I. dose: 0 ppm, II. dose: 15 ppm, III. dose: 30 ppm and IV. dose: 45 ppm) were applied. Parsley plants were harvested 75 days after of seed sowing. Some macro and micronutrient element (N, P, K, Ca, Mg, S, Fe, Cu, Zn and Mn) contents of plants were analyzed. According to the results, average total N contents of plant samples were determined as 3.93%, 3.96%, 4.01%, and 4.07%, respectively. Other macro elements were determined as follows: P (0.32 %, 0.33 %, 0.35 % and 0.33%), K (5.78%, 5.92%, 6.09% and 6.46%), Ca (0.67%, 0.76%, 0.78% and 0.79%), Mg (0.10%, 0.11%, 0.11% and 0.12%), and S (0.26%, 0.34%, 0.39% and 0.52%), respectively. Nevertheless, for some microelements, the contents were obtained as; Fe (59.06, 62.16, 65.01 and 72.07 mgkg-1) Cu (27.62, 32.03, 38.90 and 39.80 mgkg-1) Mn (24.70, 27.50, 29.03 and 31.87 mgkg-1), and Zn (21.97, 23.30, 29.60 and 57.17 mgkg-1), respectively. The increasing doses of calcium nitrate application resulted in increasing outcomes, which are statistically significant, for each of the nutrient elements.