The guava tree is the fruit of the guava tree of the species Psidium guajava L. belonging to the family of Myrtaceae a rustic fruit and adapts to the most varied types of soils. It is a fleshy fruit, thin-skinned, green, or when mature yellowish and very rich in soluble fibers. Seed germination is influenced by factors such as substrate, which can improve germination, resulting in the acquisition of more vigorous seedlings. The experiment was conducted in a greenhouse at the Federal Institute of Education, Science and Technology of Tocantins, Gurupi/TO, in 2017. The seeds of guava Kumagai and Paluma (Psidium guajava L.) used in the experiment were taken directly from the fruit, which was collected in the urban region of Gurupi in March 2017. For the two varieties evaluated, both for the first emergence count and seedling emergence, the substrates stood out: organic compound + black earth + commercial substrate (55% and 37%) (67% and 49%), washed sand + rice straw + black earth (52% and 36%) (52% and 36 %) lower substrates: washed sand (46% and 10%) (66% and 35%) and rice straw + sawdust + black ground (47% and 7%) (59% and 31%), respectively. The substrates: organic compound + black earth + commercial substrate and washed sand + rice straw + black earth provided the highest values of viability and vigour in white and red pulp guava seeds.

The Bacaba (Oenocarpus bacaba) belongs to the Arecaceae family, is a palm tree native to the Amazon, in which it is distributed throughout the Amazon basin, mainly in the regions of Pará, Tocantins, Acre, and in southern Maranhão, having as habitat the high virgin forest. The production of quality seedlings depends on several factors, and the composition of substrates is a major factor, because seed germination, root initiation, and rooting are directly linked to the chemical, physical and biological characteristics of the substrate. The experiment was carried out at the Federal Institute of Education - IFTO, Sciences, and Technology of Tocantins, in the city of Gurupi - TO, between September 5, 2018, and December 30, 2018. For the realization of the same, Bacaba seeds (Oenocarpus bacaba) were used, which were purchased at the street fair in the municipality of Gurupi - TO. Root and shoot length, number of leaves, root and shoot dry mass, first emergency count and seedling emergence were evaluated. The substrates: Washed Sand, Commercial Substrate, Pinus Bark + Sawdust Powder + Commercial Substrate, and Worm Humus + Coconut Shell + Commercial Substrate + Sawdust Powder provided the highest values of viability and vigor in Bacaba seeds.

Os solos brasileiros apresentam características mineralógicas que favorecem a adsorção do fósforo (P) e isto reduz a eficiência da adubação fosfatada. Uma estratégia para aumentar a acessibilidade do P residual (legacy P) no solo às plantas são o uso de microrganismos solubilizadores de fosfato. Aqui o objetivo foi avaliar o desenvolvimento e nutrição inicial do milho, e atributos químicos do solo após inoculação de BiomaPhos® associados a fontes fosfatadas de alta e baixa solubilidade. O experimento foi conduzido em casa de vegetação, em delineamento em blocos casualizados, em esquema fatorial (2x2), com seis repetições. O primeiro fator foi fosfato natural reativo e superfosfato triplo; e o segundo fator, a inoculação ou não de BiomaPhos®. Os fertilizantes foram aplicados em vasos com capacidade de 5 dm³ de solo e os inoculantes foram aplicados nas sementes no momento da semeadura. Foram avaliados parâmetros biométricos, atributos químicos do solo e teor e acúmulo de P foliar no milho aos 45 dias após emergência (DAE). Houve interação significativa (p<0,05) do efeito das fontes de P com inoculante para as variáveis: diâmetro do colo (DC); massa seca da raiz e da parte aérea (MSR e MSPA); relação parte aérea com a raiz (RPAR); massa seca total (MST); P foliar (Pfo); absorção de P (AP) e pH. Portanto, a associação entre os inoculantes solubilizadores de P e fertilizantes fosfatados promoveram crescimento da biomassa radicular e alteraram a disponibilidade e absorção de P durante os 45 DAE da cultura do milho. O BiomaPhos® foi mais eficiente em fonte com baixa solubilidade (FN), e seus efeitos são nulos ou negativos com fontes de P solúveis, ou seja, os microrganismos modulam o desenvolvimento do milho, o qual verificou respostas positivas do acúmulo de biomassa, teor e absorção de P do milho em estádio V6.

Cagaita seeds quickly lose their germination power when stored in the natural environmental conditions of the Cerrado. Like most native Cerrado species, data on more favorable seed viability conservation conditions are still quite scarce. The experiment was carried out in the greenhouse of the Federal Institute of Education, Science and Technology of the Tocantins in the city of Gurupi - TO, between November 5, 2019, and March 7, 2020. Cagaita seeds (Eugenia dysenterica DC.) were used to perform it. The treatments applied to the seeds consisted of five sowing times, at intervals of three days. In general, the evaluated characteristics showed sensitivity by indicating differences between sowing times, where the highest values, root, and shoot length were obtained when the seeds were sown on 11/05/2019 (12.8 cm; 10.2 cm), respectively, and lower at sowing of 11/17/2019 (7.8 cm; 7.0 cm), respectively. The values obtained from the first emergency count allowed us to differentiate the sowing times at vigor levels, they were influenced by the sowing times. Cagaita seeds, sowing soon after fruit collection, showed higher viability and vigor.

Research has been conducted with the yellow passion fruit crop, with emphasis on different formulations of substrates for seedling production, with good results. The appropriate substrate should present good physical, chemical, and biological characteristics, enabling, thus, the rapid growth of the seedling, a good dry matter content in the aerial and root parts, among other characteristics. This study aimed to evaluate the effect of different substrates on the viability and vigor of passion fruit seeds. Brs Giant yellow passion fruit seeds were used to this end (Passiflora edulis var. flavicarpa) directly from the fruits, which were collected in a property located in the municipality of Peixe in the southern region of the state of the Tocantins in Brazil. After the installation of the experiment, the process of evaluation and data collection was initiated. The highest values of root length and aerial part of seedlings were obtained when the seeds were sown in the moss substrate of Earthworm Humus, intermediate values in substrates 50% Wood Sawdust + 50% Washed Sand and 50% Black Soil + 50% Cattle Manure. It was also observed that the highest dry mass values of the root and shoot were obtained in the Earthworm Humus, intermediate values in substrates 50% Wood Sawdust + 50% Washed Sand, and 50% Black Soil + 50% Cattle Manure. The first emergency and emergence count of seedlings, due to the different substrates once again the substrate of Earthworm Humus stood out. Intermediate results were obtained in the substrates Washed Sand and 50% Black Soil + 50% Cattle Manure. The Earthworm Humus substrate of worm provided the highest values of viability and vigor in passion fruit seeds, followed by the mixture 50% Black Soil + 50% Cattle Manure. For the experiment, five types of substrates were evaluated: Washed Sand, Black soil, Wood Sawdust + Washed Sans + Black Soil + Cattle Manure, and substrate Earthworm Humus.