O processo de produção de mudas em bandejas proporciona facilidade de manejo e homogeneidade do plantel em campo. O substrato deve apresentar características físicas e químicas que proporcionem condições ideais para o bom desenvolvimento das mudas, resultando em plantas de qualidade. Sendo assim, objetivou-se com o trabalho acompanhar o ciclo de crescimento de mudas de berinjela e pimentão com uso de vermicomposto, em sistema de produção de base ecológica. O ensaio foi realizado na propriedade rural Hortvida, localizada no município de Governador Dix-sept Rosado – RN. Decorridos 25 dias após a semeadura foram avaliadas: número de folhas por planta, altura de plântula, diâmetro do coleto, comprimento da folha, largura da folha, peso da massa fresca da plântula e o peso da massa seca da plântula. Foi utilizado o delineamento inteiramente casualizado com 14 tratamentos, correspondentes aos substratos a base de esterco bovino (EBO) e esterco de pequenos ruminantes (EPR) em diferentes proporções. Mediante análise quantitativa e as condições experimentais, recomenda-se a utilização do vermicomposto 80EBO+20EPR para produção de mudas de berinjela, e para mudas de pimentão o tratamento 30EBO+70EPR e 80EBO+20EPR.

O sorgo apresenta alta responsividade à aplicação de fertilizantes, principalmente os nitrogenados. Nesse contexto, objetivou-se avaliar as plantas de sorgo (Sorghum bicolor), mediante doses crescentes de bioestimulante, na presença e ausência de nitrogênio. O estudo foi conduzido na Fazenda Experimental Luiz Eduardo de Oliveira Sales, no município de Mineiros-GO. Foi utilizado o delineamento em blocos casualizado em esquema fatorial 5 x 2, correspondentes a cinco doses de bioestimulante no tratamento de sementes (0, 3, 6, 9 e 12 mL ha-1) na presença e ausência de adubação nitrogenada, com 4 repetições, totalizando 40 unidades experimentais. A unidade experimental foi composta por quatro linhas de 4,0 m de comprimento, espaçadas 0,5 m entre si, totalizando uma área de 8,0 m2. Os resultados foram submetidos à análise de variância, onde as descrições das variáveis foram realizadas em função das doses de bioestimulantes com presença e ausência de nitrogênio de liberação gradual, realizando-se a regressão polinomial e testando-se os modelos lineares, quadráticos e, sendo escolhidos os modelos significativos de mais alto grau. Os resultados obtidos mostraram a influência do nitrogênio sobre as plantas de sorgo. O intervalo de 5,5 a 6,0 mL de bioestimulante na presença de adubação nitrogenada com nitrogênio de liberação gradual melhorou o crescimento e o rendimento de plantas de sorgo.Palavras-chave: Sorghum bicolor, reguladores vegetais, adubação nitrogenada. BIOSTIMULANT AND GRADUAL RELEASE NITROGEN IN THE PERFORMANCE OF SORGHUM ABSTRACT: Sorghum presents high responsiveness to the application of fertilizers, mainly nitrogen fertilizers. The objective of this study was to evaluate sorghum plants (Sorghum bicolor), using increasing doses of biostimulant, in the presence and absence of nitrogen. The study was conducted at the Experimental Farm Luiz Eduardo de Oliveira Sales, in the municipality of Mineiros, Brazil. A randomized block design in a 5 x 2 factorial scheme, corresponding to five doses of biostimulant in the treatment of seeds (0, 3, 6, 9 and, 12 mL ha-1) was used in the presence and absence of nitrogen fertilization, with 4 replications, totaling 40 experimental units. The experimental unit was composed by four lines of 4.0 m in length, spaced 0.5 m apart, totaling an area of 8.0 m2. The results were submitted to analysis of variance, where the description of the variables were performed according to the biostimulant doses with the presence and absence of gradual release nitrogen. The polynomial regression was performed by testing the linear and quadratic models, and the significant models were chosen and presented. The results obtained showed the influence of nitrogen on sorghum plants. The range of 5.5 to 6.0 mL of biostimulant in the presence of nitrogen fertilization with gradual release nitrogen improved the growth and yield of sorghum plants.Keywords: Sorghum bicolor, plant regulators, nitrogen fertilization.

Insects and algae demonstrate adaptability in hydroponic environments. Algae attract flies, Bradysia spp. (Diptera: Sciaridae) and Scatella stagnalis (Diptera: Ephydridae), called fungus gnats and shore fly, respectively. Flies feed on algae, damaging seedlings radicellae, and may transmit pathogens to lettuce plants. Little information on the management of flies and algae is known. A paradox in the face of the expansion of hydroponics. The objective was to evaluate the potential of hydrogen peroxide (H 2 O 2 ) as an insecticide and algaecide agent. Entomopathogenic fungi were also evaluated as an alternative control to flies. The experiment was conducted in a commercial hydroponic system under a randomized complete block design with 5 treatments and 4 replicates. The treatments, sprayed on the phenolic foam plates, immediately after lettuce seed deposition, were: H 2 O 2 , Beauveria bassiana, Metarhizium anisopliae, Spinosyn and water, as control. The quality of the lettuce seedlings (cv. Brida), the presence of flies and algae evolution in the phenolic foam plates were recorded daily. H 2 O 2 and Spinosyn affected lettuce seed germination, but were able to reduce adult flies on the phenolic foam cells. The highest number of larvae was observed with both fungi, and only water, compared to H 2 O 2 . No larvae were found in Spinosyn sprayed phenolic foam cells. However, lettuce seedlings from Spinosyn sprayed plates were those with lower fresh weight. H 2 O 2 severely retained algae infestation in phenolic foam cells over a 15-day observation period. The present work demonstrates the potential that H 2 O 2 can play as an insecticidal and algaecide agent in hydroponic environments.

The beet (Beta vulgaris L.) vegetable is of great importance in the Brazilian market, mainly by having high nutritional values in consumer diet. Thus, the objective of this work was to evaluate the effects of organic and mineral fertilization on the production and post-harvest quality of beet. The experiment was conducted in the field, in the municipality of Urutaí-GO. The experimental design was a randomized block (DCB), where treatments were applied to two types of fertilizer: organic (chicken manure) and conventional (mineral fertilizer) with six replicates (using six tubers per plot). The following evaluations were made: horizontal and vertical diameters of the tubers (cm) weight (kg) Protein (g) Lipid (%) Ash humidity (%), electrical conductivity (µS·cm −1 ), pH, Titratable Acidity and Brix. The organic surpassed conventional treatment for all variables, except for the ash content, wherein the organic treating poultry litter base, showed 1.40% of ash and pH (6.48).

A alface (Lactuca sativa) é uma hortaliça popular no planeta, destacando-se, dentre as folhosas, como a mais produzida no Brasil; é considerada um dos alimentos mais saudáveis, de grande importância alimentar e na saúde humana. Objetivou-se com este trabalho avaliar o comportamento de cultivares de alface no Oeste Potiguar. As mudas foram produzidas em ambiente protegido. Trinta e cinco dias após transplante, foram analisados os componentes de produção e de qualidade das cultivares da alface. Foi utilizado o delineamento em blocos, casualizado, com sete tratamentos correspondentes às cultivares de

The objective of this work was to assess the effects and tendencies weighted by genotypes x environments interaction for soybean, as well as to employ a biometric approach through the relative contribution of the sum of squares expected values (RCSS) and to define which levels of the variation sources determine the differential effects of the interaction. The experimental design was randomized blocks arranged in a factorial scheme (four growing environments x 20 soybean genotypes). The relative contribution of expected sums of squares values to soybean genotypes x growing environments interaction defined that the environment Tenente Portela - RS significantly influence plant height, number of pods per plant, number of reproductive nodes in the main stem, number of reproductive nodes in the ramifications, number of grains per plant and grain yield. The variation factor soybean genotypes define that number of pods per plant, number of reproductive nodes in the ramifications, number of grains per plant and grain yield are potentiated by genotype TMG 7161 RR. The biometric approach is efficient to understand the treatment levels and the slicing of simple effects of a factorial experiment, being possible to apply this methodology extensively in soybean.

The objective of this work was to analyze the performance of soybean seedlings in different seed treatments, with multivariate profiles and canonical interrelationships. The experiment was conducted in the county of Mineiros-GO. The soil was classified as a Quartzarenic Neosol. The experimental design used was a randomized block in a 5x4 factorial, corresponding to the seed treatments (WAT, CRU, FIP, FOR and STA) in 4 soybean cultivars (Bônus, Ultra, Extra and BKS7830), in 4 repetitions. Before sowing, pre-plant burndown was performed. The fertilizer used was 450 kg ha -1 of fertilizer 05-25-15 applied in the furrow and in a single dose next to the seeding. During the conduct of the experiment, the control of pests, diseases and weeds were carried out as they became necessary, respecting good practices and integrated management. The data obtained were submitted to the assumptions of the statistical model, verifying the normality and homogeneity of the residual variances, as well as the additivity of the model. Uni and multivariate tools were applied. The analyzes were performed on Rbio from R and Genes interfaces. The interaction of soybean cultivars and types of seed treatment led to variations in all analyzes evaluated in soybean seedlings. The best performances were found among the BRS 7380RR cultivars that expressed the highest shoot fresh mass when subjected to seed treatment with Cruiser, whereas the greatest root length was expressed in cultivar Ultra in the Fortenza seed treatment.

The objective of this work was to explain the cause and effect estimates on corn yield as a function of planting speed. The study was conducted from January 21 to June 15, 2019, at Fazenda Invernadinha, rural area of ​​the municipality of Mineiros, GO, Brazil. The experimental design consisted of randomized blocks, corresponding to five tractor planting velocities (4, 6, 8, 10 and 12 km h-1), in 4 replicates, where each plot consisted of 8 300 m long lines spaced at each 0.9 m, for a population of 60.000 plants ha-1. Sowing was carried out in no-till system after soybean harvest. A John Deere tractor and planter assembly were used, models 7715 (182 hp horsepower) and 2115 CCS Vacumeter (8 rows of 0.9 m respectively) with 30-hole 30 mm seed discs. Data were submitted to the assumptions of the statistical model, verifying the normality and homogeneity of the residual variances, as well as the additivity of the model. The analyzes were performed in the Rbio R interface, besides the Genes Software. It was concluded that the plant population is the variable that most influences the cause and effect estimates on corn yield. For high corn yields it is recommended that the tractor planting speed be adjusted to 6 km h-1.