Aplicação superficial de micronutrientes em áreas de sucessão soja-milho no Mato Grosso-Sinop

• Autor(a) principal: Silva, Claudison José da
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Biblioteca Digital de Monografias da UFMT
• Texto Completo: http://bdm.ufmt.br/handle/1/948
• topic: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA; Glycine max; Micronutrientes; Toxidez; Produtividade; Glycine max; Micronutrients; Toxicity; Grain yield

In Brazil soybean is the agricultural crop that occupies the largest a rea sown, has great importance in the production of vegetable oil, feed for animal feed and use in the chemical and food industry. In order for a good development of soybeans and high yields to occur, micronutrient fertilization should be emphasized and essential for plant growth and play an important role in balanced nutrition of crops. In this context, the objective of this study was to propose responses to soybean yield as atypical doses of micronutrient, zinc (Zn), boron (B), manganese (Mn) and copper (Cu) applied on the pre-planting soil surface. The studies were developed in Sinop-MT, from October to February in the 2017/18 harvest, with latitude 12 ° 03'50.3 "S, longitude 55 ° 33'13.1" W, and altitude of 383 meters with flat topography. the experiment was conducted under a randomized block design (DBC), containing 5 experiments with 5 treatments and 5 replicates, the plots were 5 x 7 m in size. The doses for boron and copper, namely: 0, 3, 6, 9 and 12 kg ha-1; manganese and zinc, namely: 0, 4, 8, 12 and 24 kg ha-1 and in addition a mix with all these micronutrients, separated for each dose interval. The cultivar NS 7901 RR was used. The Zn, Mn, B and Cu sources were Zinc Sulfate (20%), Manganese Sulphate (26%), Borogran (8%) and Sulfate of Copper (25%) . It was evaluated after harvest, productivity, weight of thousand grains, number of grains per plant, number of grains per pod, number of pods per plant and stand. Statistical analyzes did not present differences between treatments for Zn, Mn and Cu doses , resulting in a significant difference for boron and complete. For Zn these results probably occurred because the zinc content was higher than the critical level in the 0 -20 cm depth (SOUSA and LOBATO, 1998). In this case, the probability of response to zinc application is low (Anderson et al., 2003; ARAÚJO, NASCIMENTO et al., 2003). However, the Mn doses were demonstrated by Pinto (2012) that the efficiency of the application of Mn in the soil in general is low, and requires the application of doses cons idered high in relation to the micronutrients. However, in the present work (1.5, 3.0, 6.0, 12.0, and 48.0 kg ha-1), there were also increases in the levels of the micronutrients in the soils, but the concentration and amount of Mn accumulated by the soybean plants were little influenced. Probably due to the concentration of Copper being adequate in the soil, may have influenced the absence of a significant difference between the treatments, these data corroborate with works carried out by Borkert, (2002) who also showed no response to copper fertilization in four years of cultivation of soybeans, in two soils, one of clayey texture and one of medium texture. Therefore for B and complete it was observed that when done to the fertilization boratada in increasing doses there was a decrease in the stand of plants, that is, germination failure by Boro toxicity, being one of the factors that in the end affected the components of production and productivity of soybeans.