ResumoO trabalho teve por objetivo avaliar características pós-colheita de frutos partenocárpicos de melancia obtidos com uso de 2,4-D. O experimento foi conduzido na Estação Experimental da Universidade Federal do Tocantins -Campus de Gurupi/Setor de Olericultura, localizado na região sul do Estado do Tocantins. Utilizou-se o delineamento experimental blocos casualizados com quatro repetições. Os tratamentos constaram da aplicação de cinco doses de 2,4-D (150, 175, 200, 225 e 250 mg L -1 ), além de um tratamento testemunha, frutos obtidos com fertilização natural. As características avaliadas foram: massa média de frutos; formato do fruto; padrão de listras; espessura da casca na região distal; coloração externa dos frutos; sólidos solúveis totais (ºBrix) e coloração de polpa. O regulador vegetal afetou todas as características avaliadas. Para formato de fruto, firmeza da polpa, coloração externa da casca e da polpa sofreram menos influência com a aplicação do regulador. Massa média de fruto, espessura da casca, ºBrix e padrão de listras foram às características mais afetadas pelo 2,4-D. Palavras-Chaves: Citrullus lanatus L., frutificação, partenocarpia, fitohormônio. Abstract Post-harvest characteristics of parthenocarpic watermelon fruits obtained with use of 2,4-DThe study aimed to evaluate post-harvest characteristics of parthenocarpic watermelon fruits obtained with use of 2,4-D, the experiment was conducted at the Experimental Station of the Federal University of Tocantins/Campus-Gurupi in the Department of Olericulture, located in the southern region of the State of Tocantins. The treatments consisted of five doses of 2,4-D (150, 175, 200, 225 and 250 mg L -1 ), plus a control treatment, which are the fruits obtained by natural fertilization. The characteristics were evaluated: average fruit weight; fruit shape; pattern of stripes; shell thickness in the distal region; External fruit color; total soluble solids (°Brix) and color of pulp. The plant regulator affected all evaluated characteristics. For fruit shape, pulp firmness, external coloring of the shell and pulp suffered less influence with the application of the regulator. Average fruit mass, bark thickness, ºBrix and striped pattern were the characteristics most affected by 2,4-D.

Growing Japanese hybrid squash has been a cost-effective alternative to growers; however, several factors directly influence plant growth and development, nutrition being one of the main ones. Data regarding the nutrition of these vegetables are scarce. The objective of this study was to verify the effect of phosphorus doses applied via soil, on fruit yield of Japanese hybrid squash. Two experiments were conducted in 2017, May 1 through July and September 2 through November, in the experimental area of the Olericulture Sector of the Federal University of Tocantins. For the development of both experiments, it was used the Divina ® cultivar owned by the company "Horticeres seeds". The experimental design was randomized blocks with five treatments and four replications, as follows: 0; 75; 150; 225 and 300 kg ha −1 of P2O5. The characteristics evaluated were: productivity (ton ha −1 ), average fruit mass (kg), number of flowers per parcel (unit), transverse diameter (cm) and phosphorus content in Japanese squash (g kg −1 ). The mean values related to the study variables were submitted to analysis of variance, and subsequently, regression analysis. The 300 kg ha −1 dose of P2O5 provided higher yield and average fruit mass. In both growing seasons. Cultivation of the Japanese hybrid squash between September and November showed higher productivity.

Em condição tropical semi-úmido o uso do cultivo protegido pode permitir o cultivo de diferentes tipos de cultivares de alface. Usando mulching em casa vegetação, objetivou-se avaliar diferentes tipos de cultivares de alface em condição de domínio climático tropical semi-úmido. Foram instalados dois experimentos, o primeiro cultivo entre os meses de junho a julho; o segundo entre janeiro a março. Em cada época, foram avaliadas as cultivares Vera, Solaris, Mimosa e Lucy Brown. As variáveis avaliadas foram: massa fresca das plantas (g); comprimento do caule (cm); diâmetro da cabeça (cm); número de folhas por cabeça; volume das cabeças (dm3) e produtividade (Mg ha-1). Em casa de vegetação, a melhor época para cultivar alface é no período de primavera/verão onde se observou maior crescimento, desenvolvimento e rendimento das cultivares de alface; o uso do mulching em casa de vegetação em condição de domínio climático tropical semi-úmido é uma alternativa para o produtor de alface permitindo colher plantas maiores e de melhor qualidade, nessa condição com cultivo protegido usando mulching a cultivar Lucy Brow foi a que melhor se desenvolveu

Information on spatial variability of soil chemical properties is allowing an increasingly efficient management of soil fertility. This study was conducted in the municipality of Santa Rosa do Tocantins, TO, in the 2018/2019 crop year. The objectives of the study were to characterize the spatial variability of chemical properties of a dystrophic Red Latosol in the Cerrado of Tocantins using geostatistics and optimize the management of soil fertility by means of precision agronomy techniques, for more efficient input use in agricultural production areas. For the experiment, 49 soil samples were collected at 0.2 m depth, from equidistant points in a regular grid 100 m apart, over an area of ??150 ha. Each sample was composed of 5 subsamples. The soil properties evaluated included pH, bases sum, potential acidity, organic matter, total cation exchange capacity, base saturation, phosphorus, sulfur, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc. A descriptive analysis was carried out, highlighting the mean, median, minimum, and maximum values for each soil variable. In addition, the coefficients of variation, asymmetry, kurtosis, and the normality test of Kolmogorov-Smirnov were performed. The area presented significant variations in chemical and macronutrient attributes and little variation in micronutrients, except for zinc. The study reveals variations in different soil attributes and the need for correction depending on the requirements of the crop.