Ricardo de Normandes Valadares, Danieli Andrade Nóbrega, Jordana Antônia dos Santos Silva, Adônis Queiroz Mendes, Fabian Santana Silva, Fernando Antônio Tenório Rocha, Maria da Cruz Chaves Lima Moura, Dimas Menezes
This work aimed to evaluate the influence of two types of pruning techniques on agronomic traits of melon genotypes conducted under open greenhouse conditions equipped with a hydroponic system. The experimental design used was a split-plot with 2 pruning techniques x 19 genotypes in 4 replications. The study showed no significant difference within genotypes due to pruning technique (except for the number of days for maturity) and the pruning x genotype interaction. Therefore, the melon could be cultivated no matter the pruning technique used. Nevertheless, pruning based on two secondary branches seemed to be more suitable by preventing them from breaking, compared to that based on main branches. Melon genotype G-10 was found as a good compromise in terms of flowering precocity, fruit yield and quality.
Edmar Gonçalves de Jesus, Reynaldo Teodoro de Fatima, Amaralina Celoto Guerrero, Marcos Eric Barbosa Brito, Josinaldo Lopes Araujo Rocha, Adriana Silva Lima, Idelvan José da Silva, Caciana Cavalcanti Costa
Aims: To study the growth and gas exchanges of arugula plants under water stress and phosphate fertilisation as attenuator.
Study Design: The experimental design was randomised blocks, with treatments arranged in a 5 x 2 factorial scheme, corresponding to five doses of P2O5 (0, 50, 100, 150 and 200 mg dm-3) and two irrigation depths, 50% of the real evapotranspiration (ETr) and 100% ETr, with four replicates, totaling 40 experimental units.
Place and Duration of Study: The experiment was carried out in a protected environment of the Center of Sciences and Agrifood Technology (CCTA) of the Federal University of Campina Grande (UFCG), Campus of Pombal-PB, Brazil, in the period from February 2 to March 31, 2015.
Methodology: Phosphorus (P) was applied 10 days before seedlings transplantation, which was homogenised. The source was single superphosphate, which has the following composition: 18% of P2O5, 16% of Calcium (Ca) and 8% of Sulfur (S). The real evapotranspiration was determined through weighing lysimetry in the treatments that received 100% ETr. For that, the weight of the pots at field capacity (WFC) (kg) was determined from the saturation through capillarity followed by drainage until constant weight, which was considered as WFC. The pots were daily weighed to obtain the actual weight (Wa) (kg) of each pot.
Results: The dose of 200 mg dm-3 under 100% ETr leads to the best production of fresh leaves of arugula; Phosphorus application improves the gas exchanges of arugula plants cultivated under 50% ETr, with the dose of 104 mg dm-3 P2O5 delivering the greatest gains in CO2 assimilation rate.
Conclusion: Arugula growth and phytomass formation are reduced when plants are cultivated under 50% ETr, However, phosphorus application optimises the osmoprotection process of the arugula plants, but does not promote the increase of production under water deficit conditions.
Despite the huge potential of utilising Jersey cattle as diary animals in the tropical countries, the genetic basis of the relationship between milk yield and conformation traits has been scarcely described in the literature especially in West Africa. This trial therefore set a layout to estimate the additive genetic correlations, heritabilities and repeatabilities of milk, udder and body conformation traits for Jersey cattle in the Derived Guinea Savannah zone of Nigeria. Our study used a total of 4200 lactation records for milk yield and conformation traits of Jersey cows. The milk and conformation traits data was analysed by fitting and solving a multiple trait animal model solutions using average information restricted maximum likelihood algorithm. Traits with moderate to high heritabilities and repeatabilities estimates were milk yield (0.35; 0.53), body condition score (0.25; 0.31), chest ligament (0.72; 0.75), chest width (0.23; 0.28), body depth (0.61; 0.65), udder circumference (0.44; 0.45), rear udder height (0.38; 0.41), rear udder width (0.52; 0.63) and teat length (0.34; 0.40), respectively. Milk yield had the highest additive genetic correlation with body weight (0.86). We concluded that the heritability was high enough to consider the traits in selection programs. The high additive genetic correlation between milk yield and bodyweight in the derived Guinea Savannah Zone of Nigeria validates the need to considering bodyweight in selection programs geared towards improvement of milk yield of Jersey cattle born in Nigeria.
Shirlene Souza Oliveira, Eduardo Cezar Medeiros Saldanha, Marluce Reis Souza Santa Brígida, Noélle Khristinne Cordeiro, Henrique Gusmão Alves Rocha, Jose Leandro Silva de Araújo, Gabriela Mourão de Almeida, Whesley Thiago dos Santos Lobato
Objectives: The objective of this work was to evaluate the effect of doses of magnesium sulphate monohydrate for increased productivity in the cultivation of oil palm.
Location and Duration of Study: The experiment was conducted in the Company Marborges, located in the municipality of Garrafão do Norte, State of Pará, Brazil, during 2014 to 2015.
Methodology: The experiment was laid out in randomized block design, consisting of five treatments viz., magnesium sulphate monohydrate @ 0 g plant-1, 500 g plant-1, 1000 g plant-1,1500 g plant-1 and 2000 g plant-1 with three replications. Soil samples were collected from two depths i.e., 20 and 40 cm before the treatments imposition for laboratory analysis. After soil sample collection, treatments were applied manually twice, with an interval of 6 months. The harvests of fresh fruit bunches were manually performed every fifteen days within a period of two years being evaluated the sum of the number of bunches of fresh fruits produced by treatment; bunch weight of fresh fruit (Kg) and productivity (t/ha/year). Performed analysis of variance year level of 5% probability and for variables whose F was significant regression analysis.
Results: The superficial application of magnesium sulphate monohydrate to the root zone of the treated plants promoted a significant increase in the level (P<0.05) probability of error, the dose of 1500 g plant-1 provided an increase of 12% for the variable number of bunches of fresh fruit. With respect to the variable weight of fresh fruit, bunches were unable to calculate the best dose for the increase in weight was 1370 g plant-1.The dose of 1000 g plant-1 provided a 15% gain for the variable fresh fruit weight when compared to the control. For the variable productivity, this dose had a significant effect (P <0.05), when compared to dose 0.
Conclusion: This study showed that the superficial application of MgSO4 had a significant positive effect on the oil palm crop, improving nutrition in Mg and S, allowing an increase in the number and weight of fresh fruit bunch, which increased crop productivity. In the conditions studied, the ideal dose obtained by means of the derivative of the first equation was 1333 g plant-1 being between 1000 and 1500 g plant-1.
The fluctuation of the price of tomatoes during the year represents, for the Beninese population a real problem, both in terms of food and socio-economic. In this context, this work analyses the evolution of the selling prices of tomatoes in 11 Benin markets from 2006 to 2015. The tomatoes price experienced a high and strong fluctuation in most markets. The multiplicative model made it possible to isolate the trend and the seasonality. The trend has been adjusted by a 3rd order centered moving average model. Seasonality indices showed that the price is higher than the monthly average in most markets during the months from March to June. These fluctuations depend on the production system and rainfall conditions. The understanding of the evolution of the price of tomatoes is therefore necessary for the formulation of the market stabilization policies of this product.
Paulo César Ferreira Linhares, Lauvia Moesia Morais Cunha, Roberto Pequeno de Sousa, Ana Paula Morais Neves, Janilson Pinheiro de Assis, Alany Moisa Bezerra de Almeida, Maria Francisca Soares Pereira, Eudes de Almeida Cardoso, José Aluisio de Araújo Paula, Lunara de Sousa Alves
Oleric plants are grown in a system intercropping by family farmers in organic production areas in the region northeastern Brazil. The experiment was conducted in an experimental area belonging to a semi-arid rural federal university. The study was carried out in the period from August 2014 to November 2014, in order to evaluate agronomic efficiency of organic fertilised in the production of the intercropping of coriander and mint in the northeastern Brazil. The study area was designed in a randomized block area, arranged in a 2 x 4 factorial scheme set up, with three replications. The first factor set up consisted of single crop and intercropping of coriander and mint, and the second was hairy woodrose (Merremia aegyptia L.) added to cattle manure in the amounts (0.0, 2.0, 4.0 and 6.0 kg/2.0 m2). The evaluated characteristics for the coriander crop these were plant height, number of stems, green mass, number of bunches and dry mass. The evaluated characteristics for the mint crop these were biomass height, green mass, number of bunches, dry mass, oil content and yield oil. The agronomic efficiency of mint and coriander in intercropping was was obtained with the addition of 6.0 kg/2.0 m2 of organic fertilised incorporated into the soil. The equivalent area ratio was agronomically efficient, with equivalent area ratio (EAR) of 1.66.
Water is a limiting factor for the production of Papaya tree (Carica papaya L.) seedlings. Its lack leads to a reduction in the absorption of nutrients and its excess provides an environment for the development of pathogens, contributing to the leaching of nutrients, besides generating wastes. The present study aimed to evaluate the effects of irrigation depths on the growth of seedlings of ‘Rubi INCAPER 511’ papaya. The experiment was carried out at the Federal Institute of Espirito Santo, Brazil. The experimental design was completely randomized. Six treatments were used: 4, 6, 8, 10, 12 and 14 mm d-1 with 24 seedlings per treatment, totaling 144 in the experimental field. 60 days after sowing, the following morphological characteristics were evaluated: plant height, stem diameter, number of leaves, leaf area, SPAD index, shoot dry mass, dry mass of the root system and Dickson quality index. The depths between 12.5 and 14 mm d-1presented higher Dickson quality index, stem diameter, plant height and leaf number, with the 12.5 mm d-1depth being recommended for economic reasons in the production of seedlings of papaya 'Rubi INCAPER 511'.
Chives are herbs used as spice in Brazil, but their postharvest durability is short, mainly due to high metabolic rate and high moisture content. In this context, this study aimed to model the drying curves of chives at different temperatures and determine the effective diffusion coefficient and activation energy for the process. Chives were manually harvested, with moisture content of 12.0 (decimal, dry basis) and subjected to drying until reaching equilibrium moisture content, i.e., minimum amount of free water. The fitting capacity of eleven mathematical models used to evaluate drying processes in agricultural products was assessed. Treatments consisted of two physical patterns of length, whole and chopped leaves(pieces of approximately 2 cm and whole leaves of approximately 20 cm long, respectively), and four drying air temperatures (40; 50; 60 and 70°C). The fit of the studied models was assessed by nonlinear regression through the Gauss-Newton method. Among the mathematical models tested, Midilli was the one that fitted best to the experimental data. Increasing drying temperature leads to higher rate of water removal from the product.