Jeandson Silva Viana

Produção e qualidade de sementes e raízes de cenoura cultivada em solo com adubação orgânica e mineral

The inexistence of organic seeds in the market and the absence of information constitute a difficulty for the organic production. The green fertilizer efficiency (GF) was evaluated, of organic compound (OC), and biofertilizer (B) in carrot production and seeds quality, compared to conventional fertilizer (CF-control), through the treatments: 1) CF; 2, GF+B via soil; 3) GF+B via plant; 4) OC+B via soil; 5) OC+B via plant; 6) OC+GF+B via soil and 7) OC+GF+B via plant. Higher morphological values (height, length and diameter), of germination and vigor were given by treatment 5, while production and total soluble solids reached higher gradients when growing plants with treatment 4, upper data of treatment 1. Treatment 3 resulted in root production with lower number of branches nematode. Carrots of preview treatments 2 and 6 were classified in a lower size. Decomposition of GF, linked to B applied to the plant, may have given a higher carrot resistance to nematodes and better commercial classification. Organic treatments resulted in better roots and seed quality and higher production.

Dormancy Breaking in Ormosia arborea Seeds

Ormosia arborea is a tree species planted in urban areas and used to restore degraded areas. Its seeds are dormant and propagation is difficult. This study compares different dormancy breaking methods and physiological seed quality and seedling production. The seeds were germinated in sand in the laboratory of the Universidade Estadual de Santa Cruz, Ilheus, Bahia, Brazil. The following dormancy breaking treatments were applied: control (intact seeds), 100°C water immersion; boiling water immersion followed by 24 hours of soaking; scarification with number 100 and number 50 sandpaper opposite from root emergence; sulfuric acid immersion for 1 hour, 50, 45, and 30 minutes. Seed immersion in 100°C and boiling water did not break the dormancy. The study species showed a greater vigor of seedling when its seeds were submitted to treatments associated with tegument rupturing by sandpaper or sulfuric acid. On the other hand, seed scarification with sulfuric acid for 1 hour, 50, 45, and 30 minutes or sandpaper favored seed germination and vigor.

Physiological Potential Evaluation of Myracrodruon urundeuva Stored Diaspores

The conservation of seeds in an appropriate location combined with the utilization of rapid tests for monitoring the physiological aspects is essential for quality seedlings. Thus, the study aimed to evaluate the behavior of Myracrodruon urundeuva diaspore under different periods and storage environments, and verify the testing of individual exudate pH in the physiological monitoring. The experimental design was completely randomized, factorial 2 × 8 (8 periods of storage and 2 storage environments) with four replications of 25 diaspores, using the Tukey test at 5% probability for average comparisons. After analysis of variance, it was performed regression analysis for the quantitative factor and simple Pearson correlation test. The variables analyzed were moisture content, seedling emergence (E) emergence velocity index (IVE), mean emergence time (TME) and the pH of the individual exudate. The results of E, IVE, TME tests indicated that the Myracrodruon urundeuva diaspores could be stored for ten months in room fridge, with low vigor loss. The pH test individual exudate showed lower estimates of simple Pearson correlation with the emergence test, not monitoring the physiological potential of Myracrodruon urundeuva diaspores.

Application of dairy residue in peanut (Arachis hypogaea L.) cultivated in Northeastern Brazil

Peanut (Arachis hypogaea L.) is one of the widely cultivated legume in tropical and subtropical regions. The aim of this study was to evaluate the agronomic characteristics of peanut (BR1) under different doses of dairy residue. The experiment was conducted as a randomized block design with three replicates. The treatments consisted of doses of milk residue: 0, 2.5, 5, 7.5, 10 m 3 ha -1 and an additional control containing phosphors and potassium (PK) at dose of 15 and 50 kg ha -1 . The following characteristics were determined in plants: leaf area, number of stems, shoot and root system length, dry weight of shoot and root system, number of pods and grain yield. The dose of 5 m 3 ha -1 provided the highest agronomic characteristics. The grain yield was greater for the dose of 10 m 3 ha -1 . The dairy residue can be used as a source of fertilizer on peanut crop by meeting their nutritional requirements.

Peanut seed yield under influence of fertilizer and biostimulant

Nowadays, the search for increase in the crop productivity with high organoleptic, physical and physiological quality of seeds remains one of the main objectives. Considering the importance of peanuts (Arachis hypogaea L.) for Brazilian agriculture and for the production of seeds, it is indispensable to use technological innovations aiming at the advancement of productivity and profitability for the seed producer. This study aimed to evaluate the yield and the components of peanut seed production of cultivar BR1, subjected to the foliar and seed application of Ca + B, Mo + P and Stimulate®. The design was randomized blocks with the use of three products (Ca + B, Mo + P, Stimulate ® ), two types of applications (via foliar and seed), the PK culture, and the absolute control, following a factorial scheme of [(3 × 2) + 2]. The doses of 2.0 mL/kg (Ca + B), 1.6 mL/kg (Mo + P), and 15 mL/kg (Stimulate ® ) via seeds were indicated the best for the development of the peanut crop due to its profitability and efficiency. The application of Ca + B, Mo + P, and Stimulate ® via seeds is beneficial for the initial counting, emergence, emergence speed index, biological productivity, pod production, seed production and leaf area.