A produção de cana-de-açúcar no Brasil, estimada para a safra 2019/20, é de 615,98 milhões de toneladas, sendo Goiás, o segundo estado com maior produção. Segundo estimativas, as áreas destinadas para mudas no setor sucroalcooleiro são representativas, tendo sido de 48 mil hectares na safra 2018/2019. A cana-de-açuar é a cultura de maior área irrigada do país. Estudos relatam que a frequência e a lâmina de irrigação devem variar com os períodos de crescimento da cana. O cultivo da cana-de-açúcar a partir de mudas tem permitido a redução do volume gasto de colmos, por proporcionar alta taxa de multiplicação. Assim, o presente estudo objetiva esclarecer alguns dos pontos de interferência do desenvolvimento da cana-de-açúcar, buscando avaliar as características de qualidade de mudas pré-brotadasa partir de duas frequências de irrigação, verificando a idade de viveiro com melhores desempenhos para a produção da muda e a interferência das partes do colmo de onde são extraídas as gemas para produção. O pré-ensaio, foram plantadas no Instituto Federal Goiano-Campus Ceres-Goiás 16 variedades. Na segunda etapa, os experimentos foram instalados em ambiente protegido, na cidade de Goianésia, no dia 19 de fevereiro de 2019, e avaliados na fase inicial por 21 dias, sendo as avaliações feitas com intervalos de três dias e a validação no dia 19 de março de 2019. Os dados a seguir são do experimento original. A variedade determinada foi a CTC 4. O delineamento experimental para o experimento foi DBC em parcelas subdivididas 3x2, com 4 repetições, frequência de irrigação (1x e 2x), sendo três idades - 14 meses, 10 meses e 6 meses. Todos os dados foram analisados pelo software SISVAR. As frequências de irrigação desempenharam influência nas avaliações iniciais da germinação. Idade do material propagativo de 6 meses é superior em 19,98% às gemas de 10 meses e 12,88% às de 14 meses. Quanto à posição das gemas no colmo. Quanto ao índice de qualidade de Dickson (IQD), as mudas de viveiros mais jovens foram superiores às demais.

The objective of this study was to evaluate the performance of the common bean crop grown with application of osmoprotectants based on algae of the genus Durvillaea potatorum in the winter crop season, with occurrence or not of water suppression. The experiment used a randomized block design, in split plots, arranged in a 4x7 factorial scheme, in which the plots were composed of four treatments - periods of water suppression (7, 14, 21 days and the control treatment: 100% of field capacity throughout the crop cycle) and the subplots consisted of seven types of osmoprotectants. The treatments with osmoprotectants was applied during the full flowering of the common bean. Three days after application of osmoprotectants, the treatments with suppression of irrigation were established. The use of osmoprotectants based on algae of the genus Durvillaea does not affect the variables plant height, stem diameter, stem and pod dry matter, first pod height, number of pods per plant and number of grains per pod in common bean plants cultivated with occurrence of water suppression. Common bean plants under water restriction conditions have lower leaf and shoot dry matter and lower 100-grain weight. Common bean grain yield was influenced by the type of osmoprotectants and the water suppression period.

Cotton has great socio-economic importance due to its use in textile industry, edible oil and biodiesel production and animal feed. Thus, the objective of this work was to identify the best potassium rate and soil management for cotton crops and select among cultivars, the one that better develops in the climatic conditions of the Cerrado biome in the State of Goiás, Brazil. Thus, the effect of five potassium rates (100, 150, 200, 250 and 300 kg ha-1 of K2O) and two soil management systems (no-till and conventional tillage) on the growth, development and reproduction of four cotton cultivars (BRS-371, BRS-372, BRS-286 and BRS-201) was evaluated. The data on cotton growth and development were subjected to analysis of variance; the data on potassium rates were subjected to regression analysis; and the data on cultivars and soil management to mean test. The correlation between the vegetative and reproductive variables was also assessed. The conventional tillage system provides the best results for the herbaceous cotton, regardless of the others factors evaluated. The cultivar BRS-286 has the best results in the conditions evaluated. The cultivar BRS-371 under no-till system present the highest number of fruiting branches at a potassium rate of 105.5% and highest number of floral buds at a potassium rate of 96.16%. The specific leaf area was positively correlated with the number of bolls per plant at 120 days after emergence of the herbaceous cotton.

The study aimed to evaluate the nitrogen sources and doses application effects on the dry matter production and the sugar and alcohol gross yield of sugarcane (SP80-1816) in the cane-plant cycle in a dystrophic Red Oxisol. The experiment was conducted in the Fazenda Rio Paraiso II field, belonging to Usina Raizen, in Jatai - GO. The experimental design used was randomized blocks, arranged in a factorial scheme (2 x 4), with three replications. The treatments consisted of two nitrogen sources (urea and ammonium nitrate) and four nitrogen doses (0, 60, 120, and 180 kg ha(-1)). Dry matter variables were analyzed in sub-subdivided plots, as four evaluation periods were added (210, 250, 290, and 330 days after planting). The evaluation periods influenced sugarcane dry matter, and urea favored these variables to the ammonium nitrate's detriment. In contrast, the opposite occurred for stalk yield and sugar and alcohol yields, in which ammonium nitrate provided greater increments. The increase in nitrogen doses provided linear gains in practically all studied variables.

Sugarcane requires high doses of phosphorus to achieve high productivity. However, not all the phosphorus applied to crops is utilized. Therefore, it is believed that some remaining phosphorus can meet the nutrient demand of the ratoon crop. The objective of this study was to evaluate the effects of mineral fertilization with triple superphosphate (TSP) and organic fertilization with poultry litter (PL), applied to plant cane and the first ratoon, on the quality of second ratoon sugarcane. The experimental design was a randomized complete block design with a 5 × 5 factorial scheme with four replications. The treatments consisted of five TSP doses (0, 60, 120, 180, and 240 kg ha⁻¹) and five PL doses (0, 2, 4, 6, and 8 t ha⁻¹). Fertilization with TSP and PL applied in the two preceding cycles promoted an increase in plant height, stalk diameter, number of tillers, and productivity in the second ratoon. The doses of triple superphosphate and chicken litter applied in cycles preceding the second ratoon were able to increase the agronomic performance of the genotype IACSP95-5094. However, the highest subsequent combined doses of triple superphosphate and chicken litter resulted in a 27% increase in stalk productivity. In general, the preceding doses of chicken litter showed greater potential to enhance the technological attributes.