BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura

Journal Information
ISSN / EISSN : 0034-7655 / 2318-2407
Published by: Brazilian Journal of Agriculture (10.37856)
Total articles ≅ 624
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Adônis Moreira, Reinaldo Paula Ferreira, Duarte Vilela, Larissa Alexandra Cardoso Moraes
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 425-438; https://doi.org/10.37856/bja.v96i2.4275

Abstract:
Improvement to animal genetics requires the supply of superior quality forage, such as alfalfa (Medicago sativa L.). Under tropical and subtropical conditions in Brazil, alfalfa cultivation has been restricted to the 'Crioula' cultivar, although studies have indicated that other cultivars have excellent potential of yield. The objective of this work was to evaluate the adaptation and longevity of 92 alfalfa cultivars to the tropical edaphoclimatic conditions by assessing shoot dry weight yield (SDWY), crude protein content (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and nutrient content in SDWY. The 'Crioula', 'P 105', 'Rio Grande', and 'Springfield' cultivars were the most promising owing to their higher yield and lower reduction in SDWY. Crude protein (CP) content varied among cultivars, with the highest value found in 'Pro INTA Lujan' (24.5%) and the lowest found in 'Pecos' (18.8%). NDF content ranged from 25.8% ('Key II') to 38.7% ('California 50'), while ADF content ranged from 16.4% ('F 708') to 24.8% ('Diamond'). Nutrient levels of all cultivars were within the levels considered appropriate for tropical conditions.
Elston Kraft, Luís Carlos Iuñes De Oliveira Filho, Carolina Riviera Duarte Maluche Baretta, Pierre Marcel Perreira, Evandro Spagnollo, Leandro Do Prado Wildner, Osmar Klauber Filho, Dilmar Baretta
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 388-407; https://doi.org/10.37856/bja.v96i2.4255

Abstract:
The objective was to evaluate the relationship of soil fertility in areas with productivities gradients of soybean managed under no-tillage system (NT) in Western Santa Catarina, Brazil, and the interaction of this fertility with the physical and biological attributes of the soil. Areas with NT of High (NTH), Medium (NTM) and Low (NTL) soybean productivity were selected during the agricultural years 2016/2017 and 2017/2018. In each system, a sampling grid of 3 × 3 points, positioned 30 m apart, was used. Univariate analysis of the data showed no difference between the systems. However, principal component analysis helped identify the attributes that can affect productivity. Redundancy analysis identified the influence of biological attributes on some soil nutrients. The explanation for higher soybean productivities in NT system should not consider just the chemical fertility of the soil, but a holistic approach to fertility.
Eduardo De Castro Mattos, Thaís Cattarine Henriques Tomé, Rafael Braghieri Menillo, Fábio Ricardo Marin
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 446-470; https://doi.org/10.37856/bja.v96i2.4250

Abstract:
The objective of this study was to evaluate the technical and economic feasibility of installing central pivot irrigation systems in current days (Scenario A) and in two future scenarios, one with a 10% increase in rainfall (Scenario B1) and the other with 10% reduction in rainfall (Scenario B2). For both future scenarios, an increase of 2ºC in the global temperature and the concentration of atmospheric carbon dioxide (CO2) increasing to 528 ppm (parts per million) were considered. For the study, the recommendation for an area of clayey soil and with the sugarcane cycle was evaluated on three different planting dates: May 15, August 15 and November 15. The DSSAT/CANEGRO model was used, and under the current conditions, the simulations indicated greater yield for planting in May, both for rainfed and irrigated. For scenario B1, there was an increase in yield of 22% for rainfed and 33% for irrigated. In addition, irrigation provided yield gains in the two future scenarios of 13% and 14% for B1 and B2, respectively. Based on the results obtained, central pivot irrigation proved economically viable in the simulated climatic conditions. Therefore, the increase in sugarcane production provided by irrigation in agronomic management was sufficient to make investment in the region in question feasible. It is suggested to repeat the study in other regions, since the existing synergy between the factors that define agricultural yield can change the decision making about the implantation of irrigation systems in the production environment.
Gabriel Ferreira Paiva, Tayane Patrícia de Oliveira Malanski Barbieri, Bruna Da Silva Melo, Francisco José Teixeira Gonçalves,
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 439-445; https://doi.org/10.37856/bja.v96i2.4276

Abstract:
This work aims to test the antifungal effect of essential oils of Eucalyptus citriodora, Mentha spicata and Mentha arvensis in vitro. The study was carried out in a completely randomized block design, with a factorial scheme of three treatments and five concentrations, in concentrations of 0, 50, 100, 500 and 1000 mg ml -1 . The data obtained were subjected to analysis of variance and compared using the 5% t test. It was possible to conclude that the tested oils have compounds effective in inhibiting the mycelial growth of Pythium sp., suggesting the possibility of use for the formulation of biofumigants for soil treatment.
Léo R. F. Louzeiro, Adalton Raga, Miguel F. de Souza-Filho, Laura J. Gisloti
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 380-387; https://doi.org/10.37856/bja.v96i2.4284

Abstract:
Fruits of two cultivars of guava, Psidium guajava L., (‘Tailandesa’ and ‘Kumagai’) and garlic passion fruit, Passiflora tenuifila Killip were collected to evaluate the infestation and co-infestation of frugivorous flies and the associated parasitoids and new hosts. Five species of Tephritoidea were recovered in Tailandesa guavas, three species in Kumagai guavas and three species in garlic passion fruit. This is the first report of a frugivorous fly infesting P. tenuifila. Individualization of the fruit samples was used to determine the co-infestation between Anastrepha spp., Ceratitis capitata and Neosilba spp. in each fruit. There was a fly/parasitoid association for Doryctobracon areolatus and Lopheucoila anastrephae with Anastrepha fraterculus in guavas. Infestation indices and emergence rate demonstrated that Tailandesa and Kumagai guavas are hosts capable of withstanding an infestation index ≥ 50 pupae/fruit and have an emergence rate ≥ 75%. The ability of some hosts to maintain and sustain the population of frugivorous flies at high levels may interfere with pest management.
, Bruno Da Silva Santos, Raquel Anjos De Souza, Alessandra Regina Butnariu, , ,
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 408-424; https://doi.org/10.37856/bja.v96i2.4283

Abstract:
The damage caused by the diamondback moth is a limiting factor in the production of brassicaceous plants worldwide and biological control by an egg parasitoid may be an effective way to control this pest. Thus, understanding oviposition preferences of pests and parasitoids in crop plants can be a key factor in optimizing biological control programs. The present study was aimed at determining the oviposition preference of Plutella xylostella and Trichogramma pretiosum in collard greens. Bioassays consisted of collard plants in cages and P. xylostella adults released inside to lay eggs on the leaves. After 24 hours, the adults were removed and T. pretiosum females released. In another experiment, cardboard strips containing P. xylostella eggs were offered to T. pretiosum released in cages with a collard greens plant inside and replaced every 2 hours for 24 hours. The results showed that P. xylostella has a preference for laying eggs on the leaves of the middle region of the plant, on the upper part of the adaxial surface. For T. pretiosum, no preference was observed, but mean parasitism rates were highest on the upper region of the adaxial surface, where most of the eggs were found. In the second experiment, the highest mean parasitism rates by T. pretiosum were observed at temperatures ranging from 25.9 to 37.4 °C and relative humidity between 42 and 78% in the photophase. No parasitism occurred in scotophase, indicating that field releases should be performed preferably in the early hours of the morning.
Jeferson Mineiro, Carlos Flechtmann
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 374-379; https://doi.org/10.37856/bja.v96i2.4273

Abstract:
On a survey of plant mites in the State of São Paulo, Brazil, a vagrant eriophyid mite on the leaves of Luffa cylindrica was collected and proved to be new for Science. It is herein described and figured.
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 339-354; https://doi.org/10.37856/bja.v96i1.4269

Abstract:
This study evaluated the effect of different crops grown during soybean offseason on the development and reproduction of Spodoptera eridania (Cramer). The experiment was conducted in laboratory at 25°C±1°C, relative air humidity of 70%±10% and a 12h photophase. The plants evaluated were cotton (FMT 701), sunflower (Embrapa 122-V2000), rattlebox (Crotalaria spectabilis Roth), corn (Dekalb 370) and millet (DR-300). The less suitable hosts for the survival of S. eridania were rattlebox, corn and millet. Only cotton and sunflower the specie completed its development (egg to adult). Corn, millet and rattlebox were the crops that most affected the performance of S. eridania, and therefore they could potentially be used in the soybean offseason period to interrupt the life cycle of this species, and thus reduce population incidence during soybean season.
Murilo Vieira Loro, Ivan Ricardo Carvalho, José Antonio Gonzalez da Silva, Natã Balssan Moura, Danieli Jacoboski Hutra, Francine Lautenchleger
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 324-338; https://doi.org/10.37856/bja.v96i1.4258

Abstract:
The objective of this work was to evaluate the interference of physical, nutritional, sanitary and genetic aspects in the quality of seeds. The experimental design used was randomized blocks, using 55 soybean F6 genotypes, with 4 replications. In this study, thousand seeds mass, germinated seeds, accelerated aging, tetrazolium, phytosanitary indicators (Aspergillus flavus,Cercospora kikuchii, Fusarium graminearum,Fusarium semisectum and Bacteriosis), seed nutritional indicators (nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, copper, iron, manganese, zinc, sodium and molybdenum). The physiological quality of the seeds is negatively affected by the health aspects of Cercospora kikuchii, Aspergillus flavus, Fusarium semictectum and Bacteriosis, in addition, nutritional aspects also act negatively due to the presence of salts, and positive due to the levels of P. Likewise, Zn, Mo and K are correlated as strong indicators of seed vigor levels. The developed genotypes have excellent behavior towards pathogens and seed nutrition, contributing to high quality seed production.
Evaldo Cervieri Filho, Géri Eduardo Meneghello, Francisco Amaral Villela, Ivan Ricardo Ricardo Carvalho, Francine Lautenchleger, Natã Balssan Moura
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, Volume 96, pp 314-323; https://doi.org/10.37856/bja.v96i1.4259

Abstract:
The aimed of study to evaluate soybean performance and canonical interrelationships towards spacing between sowing lines. This study was developed in the 2019/2019 crop season, in the county of Lagoa da Confusão-TO. The experimental design used was randomized blocks with four replications, using five spacing between lines (45, 35, 25 21 and 17 centimeters), conserving the same plant population. The plots consisted of four lines ten meters long. The was 30 cm between rows, demonstrating that it is attractive for soybean sowing. To this end, it should be noted that the reduction in the spacing of the sowing line leads to an increase in costs and operating time, which can make this recommendation unfeasible. In the desire for two consecutive plantations during the water season, it causes the rural producer to neglect some agronomic practices that increase yields, especially when they arise from the increase in operational time.
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