The length of the hypocotyl has been highlighted as a potential descriptor of the soybean crop. However, there is no information available in the published literature about its behavior over several planting times. The present study aimed to identify soybean cultivars with stability and predictability of hypocotyl length behavior through neural networks and traditional adaptability and stability methodologies. We analyzed 16 soybean cultivars in 6 planting seasons under greenhouse conditions. In each season, a randomized block design with 4 replications was adopted. The experimental unit was composed of 3 plants. The plot mean was used in the analysis. Hypocotyl length data were analyzed by analysis of variance and Tukey’s test. Then analyses were carried out using the Traditional Method, Plaisted and Peterson, Wricke, Eberhart and Russell, and Artificial Neural Networks. A significant effect (p<0.01 by the F test) was identified for Cultivars versus Planting Season and Planting Seasons and Cultivars. Cultivars BRS810C, BRSMG760SRR, TMG1175RR, and BMX Tornado RR showed lower averages, high stability, and general adaptability regarding soybean hypocotyl length whereas the cultivar BG4272 presented higher mean, high stability, and general adaptability. Identification of soybean cultivars of predictable and stable behavior as to hypocotyl length contributes to Soybean Improvement as it further our knowledge on the potential descriptor and the possibility of increasing the number of descriptors.

Seed treatment is the most efficient technique for controlling pests and pathogens that can influence the initial development of the crop. However, storing treated seeds may damage the physiological quality. Thus, the objective of this study was to evaluate the influence of storage on the physiological quality of treated soybean seeds and on the morphology of soybean seedlings. The treatments were carried out with Fludioxonil, Imidacloprid and Anthranilic Diamide, in the dosage of 200, 150 and 100 mL of the commercial product 100 kg of seeds, respectively, from the cultivar BRSMG752S. The experimental designs used were randomized blocks (greenhouse) and completely randomized (laboratory), in a simple factorial 4x4scheme, with 4 sowing times (30, 20, 10 and 0 days after treatments) and 4 treatments (3 products and untreated seeds) with 4 repetitions. The treatment of soybean seeds with Anthranilic Diamide submitted to different storage periods was the one with the closest physiological quality to the treatment without application of agrochemicals. The soybean seeds treated with Imidacloprid showed a reduction in physiological quality with the storage time, reduction (in general) in the root length and presented a lower seedling length at 20 days of storage.

Objetivou-se identificar diferença entre grupos de cultivares, estudar o efeito da profundidade de semeadura sobre o diâmetro do hipocótilo e o comportamento do diâmetro do hipocótilo ao longo do desenvolvimento das plantas de soja. Para isto analisou-se cultivares de soja em estádio inicial de desenvolvimento, em condições de casa de vegetação, quanto ao diâmetro do hipocótilo em dois sentidos: COTsentido dos cotilédones e OPCOTsentido oposto aos cotilédones. Os dados foram analisados por meio da análise de variância, teste de médias (Tukey ou Scott-Knott), regressão e correlação fenotípica e genotípica. E, estimados o coeficiente de variação e coeficiente de determinação genotípica. Verificou-se que as cultivares de soja se diferenciam quanto ao diâmetro do hipocótilo e identificou-se grande influência genética em detrimentos aos efeitos ambientais. Semeadura de 1 à 3 cm de profundidade não influenciou o diâmetro do hipocótilo, avaliados nos estádios V2 e V3, ao analisar plantas das cultivares TMG 4185, BRSMG 68 [Vencedora], BRS 7980 e BRS 8381. As cultivares 98Y30, TMG1174RR e TMG 4185 apresentaram comportamento semelhantes quanto ao diâmetro do hipocótilo no período de 0 à 48 dias após o estádio de desenvolvimento V1.