Boron fertilisation at different phenological stages of soybean

Abstract

The high global food demand has led to crop management practices such as the use of micronutrients to increase soybean productivity. The aim of the present study was to evaluate the effect of boron fertilisation applied to two varieties of soybeans at different doses and different phenological stages on yield components, productivity and physiological quality of seeds. Two different soybean varieties were tested, one conventional (variety BRS 7980) and one transgenic (variety M 7739 IPRO), in two field experiments performed in parallel during the 2014/2015. A randomised block experimental design was used in both experiments, with a 3 x 5 factorial scheme, with four replicates per treatment. The tested factors were three phenological stages (V6, V9 and R1) and five boron doses (0, 1, 2, 3 and 4 B kg ha -1 ). The following parameters were analysed: leaf boron concentration, chlorophyll concentration, yield components and productivity. Boron fertilisation at different phenological stages had no effect on most agronomic traits, but it did increase productivity in both varieties, independent of the phenological stage of application. The boron dose indicated for maximum production for both varieties is 3.51 kg B ha -1 .

Technical and Economic Viability of Wheat with Forms of Application and Doses of Boron

“…However, for Brazilian Cerrado conditions, Gomes et al (2017) verified higher grain yield of soybeans with the application of 3.51 kg ha -1 of B, which can be explained mainly by the conditions of low organic matter of the soil. Factors that affect soil boron availability to plants include soil moisture, texture, temperature and organic matter content.…”

“…The average prices were quoted in the region of Selvíria, MS, Brazil, in 2017 (average of three years ago 2015and 2017, according to IEA, 2017. In this study, simulations were performed as if each experimental treatment represented commercial crops.…”

“…Factors that affect soil boron availability to plants include soil moisture, texture, temperature and organic matter content. Boron availability increases with increasing soil moisture, clay content, and organic matter content (Gomes et al, 2017). Table 2 shows the structure of the total operating costs (TOC) of the wheat crop in the municipality of Selvíria, describing the treatment with application in straw and boron dose of 0 kg ha -1…”

“…In the period from 2012 to 2016, the annual average area of wheat cultivated worldwide was approximately 220 million hectares, reaching 734 million tons in the 2015/2016 harvest (USDA, 2016). Muhmood et al, 2014), and boron deficiency is the most common micronutrient limitation in plants (Raimundi et al, 2013;Gomes et al, 2017).…”

Boron fertilization affects the physiological quality of soybean seeds, conventional and transgenic

“…Low levels of organic material and high levels of sand contribute the lack of boron that is common in Brazilian soils and that has led to significant productivity losses (Oliveira et al, 1996). Gomes et al (2017) working with boron application in different soybean cultivars indicate 3.51 kg ha -1 of B for the maximum soybean production without occurrence of toxicity. The occurrence of toxicity is also dependent on the type of soil, organic matter and soil moisture.…”