Uso de bioativador, bioestimulante e complexo de nutrientes em sementes de soja

Abstract

INTRODUÇÃOA soja é a principal oleaginosa cultivada no mundo, sendo a cultura agrícola brasileira que apresentou maior crescimento, nas últimas décadas, ocupando, aproximadamente, 50% da área agrícola plantada (Conab 2013), o que contribui, significativamente, para a economia do País. Dentre os fatores que contribuem para assegurar o bom desempenho da cultura, está a utilização de sementes de alta qualidade, capazes de proporcionar adequado estabelecimento da cultura no campo. ABSTRACT RESUMOA qualidade de um lote de sementes é determinada pela sua condição genética, sanitária, física e fisiológica. A caracterização da qualidade fisioló-gica das sementes é baseada, fundamentalmente, no teste de germinação, o qual já possui metodologia padronizada. Porém, por ser conduzido em condições ideais, o teste possui limitações, como a inabilidade para detectar diferenças de qualidade entre lotes com alta germinação (Hampton & Tekrony 1995). Neste sentido, para a avaliação da qualidade fisiológica de sementes, de forma ampla e segura, é necessária a Use of bioactivator, biostimulant and complex of nutrients in soybean seeds New discoveries have stimulated the use of different substances with physiologic effects, in order to develop agricultural crops. Thus, this study aimed at evaluating seeds treated with biostimulant, bioactivator and nutrients, in the initial development of soybean seeds. Two lots of seeds (high and low vigor, BMX Potência RR cultivar) were used. The products tested were an insecticide with bioactivator effect, a plant growth regulator with biostimulant effect, a complex of nutrients and a control. Under laboratory conditions, the parameters water content, germination, first germination counting, accelerated aging, cold test, length and dry matter weight of seedlings were evaluated. Under greenhouse conditions, evaluations included emergence, emergence speed index, length and dry matter weight of seedlings. The efficiency of the products tested was affected by the seed physiologic quality, with a more pronounced effect for the products in high vigor lots. In general, the treatment with best results for initial performance was the complex of nutrients, followed by the plant growth regulator with biostimulant effect. The bioactivator had negative effect on seeds germination and seedling development. KEY-WORDS:Glycine max L.; seed vigor; seed treatment.

Physiological potential of soybean seeds over storage after industrial treatment

“…Moreover, superior germination performance was obtained in associating Fertilizer I and Technology II (T6) in the accelerated aging test (Table 5), compared to the results of their pairs of technology (T5 and T7). Bays et al (2007) reported a neutral effect after the application of cobalt, molybdenum, and boron on seeds in chemical treatment, whereas Binsfeld et al (2014) observed superior vigor in soybean lots when treated with a nutrient complex, which, in addition to these micronutrients, contained nitrogen and phosphorus, as in the fertilizers used in this study. However, these elements cannot be credited with the positive effect on physiological potential observed in this study, nor in that of Binsfeld et al (2014) since, during emergence, cotyledons are the structures responsible for seedling nutrition (Marcos-Filho, 2015).…”

“…Information in the literature regarding the physiological and agronomic performance of soybean seed treated immediately before sowing is not scarce (Pereira et al, 2007;Binsfeld et al, 2014). However, unlike the treatment performed on the farm itself, industrial seed treatment occurs months before sowing (Strieder et al, 2014), a practice that may lead to deterioration of the seed lot.…”

“…In spite of the beneficial effects of fungicides and insecticides in crop protection, harmful effects they may have on the physiological potential of soybean seeds have not infrequently been reported (Dan et al, 2010;Dan et al, 2011;Avelar et al, 2011), associated or not with fertilizers (Bays et al, 2007;Farooq et al, 2012;Binsfeld et al, 2014). However, little is known regarding the combined effect of these products on seed physiological performance over the storage period.…”

Biostimulants on mineral nutrition and fiber quality of cotton crop

“…Several studies have found high rates of soils with deficiency or toxicity caused by various elements in all parts of Brazil, and those that have more critical levels of deficiency are Mo, Co, Zn, Cu, Mn and B, especially in the Cerrado biome (Binsfeld et al, 2014). Experiments carried out using bioregulators in annual crops are inconsistent and the results do not always enable the adoption of this practice in a systematic way.…”

Interferência do oxigênio na conservação das sementes de arroz

“…Diversos parâmetros podem influenciar a qualidade das sementes, tais como adversidades durante o desenvolvimento das sementes, relacionadas à inadequação nutricional, à limitação da água e às pragas, durante a colheita, relacionado à época (DINIZ et al, 2013) e na pós-colheita, relacionado ao beneficiamento (PEREIRA; ALBUQUERQUE; OLIVEIRA, 2012), ao tratamento (BINSFELD et al, 2014) e ao armazenamento BORBA, 1993).…”