Availability of boron in clayey and sandy soil due to the application of different borated sources in soybean cultivation

K F Bento,E L Schoninger,C B Raimundo,E Carniel,R R Rocha

doi:10.36560/131120201191

Abstract

Boron deficiency in the soil is commonly found throughout the country, mainly in cerrado soils, making it extremely necessary to fertilize such a micronutrient. Therefore, this study aimed to evaluate the availability of boron in clay and sandy soils with different sources of borated fertilizers in soybean cultivation in the 2018/19 soybean harvest. The availability of boron was evaluated by the method with hot water extraction in a soil sample in different soil layers and at a different time of collection. The experiment was assembled in randomized blocks (DBC), with 5 treatments and 4 replications, as follows: split boric acid: twice, total boric acid: one application of the integral dose, Granulex ®️, Produbor®️ and control treatment Granulex provided higher B content in the soil in the 1st collection, in the 10-20 cm layer in cl In sandy soil, the different sources did not defer under the availability of B at all depths and collections. In general, clayey soils retain B more when compared to sandy soils

Highlights

Brazil is the second largest grain producer in the world, second only to the United States of America (USA), standing out in soybean cultivation (Glycine max) with a planted area of 35.1 million hectares and an estimated production of 116,996 million tons in the 2017/2018 harvest (CONAB, 2018).The state of Mato Grosso is the largest soybean producer at the national level, with an estimate for the 2018/19 harvest of 9.66 million hectares of cultivation and production of 32.50 million tons, representing about 28.5% of all national soybean production.The use of technologies allowed the expansion of agricultural areas, especially in areas of the cerrado, characterized by flat or smooth wavy relief, with good possibilities for the use of mechanized agricultural practices (MONTEZANO et al, 2006)
The experiment was assembled in randomized blocks (DBC), with 5 treatments and and control treatment Granulex provided higher B content in the soil in the 1st collection, in the 10-20 cm layer in cl In sandy soil, the different sources did not defer under the availability of B at all depths and collections
The results of B availability obtained suggest that the dynamics of mobility of this micronutrient is influenced by the type of soil, the composition of fertilizer and dependent on dynamism in the periods of long rainfall, because in very rainy areas, where B can be leached (COMMUNAR; KEREN, 2007; SILVA et al, 1995)

Summary

Introduction

Brazil is the second largest grain producer in the world, second only to the United States of America (USA), standing out in soybean cultivation (Glycine max) with a planted area of 35.1 million hectares and an estimated production of 116,996 million tons in the 2017/2018 harvest (CONAB, 2018).The state of Mato Grosso is the largest soybean producer at the national level, with an estimate for the 2018/19 harvest of 9.66 million hectares of cultivation and production of 32.50 million tons (lMEA, 2019), representing about 28.5% of all national soybean production.The use of technologies allowed the expansion of agricultural areas, especially in areas of the cerrado, characterized by flat or smooth wavy relief, with good possibilities for the use of mechanized agricultural practices (MONTEZANO et al, 2006). Brazil is the second largest grain producer in the world, second only to the United States of America (USA), standing out in soybean cultivation (Glycine max) with a planted area of 35.1 million hectares and an estimated production of 116,996 million tons in the 2017/2018 harvest (CONAB, 2018). The state of Mato Grosso is the largest soybean producer at the national level, with an estimate for the 2018/19 harvest of 9.66 million hectares of cultivation and production of 32.50 million tons (lMEA, 2019), representing about 28.5% of all national soybean production. Most soils located in Mato Grosso are classified as Latosols: deep with little differentiation of subsequent horizons, low CTC, low fertility and very weathered (OLIVEIRA, 2006). Nutrients are classified as macro and micronutrients, and this distinction is by purely quantitative aspects, totaling seventeen fundamental elements for plant development: N, P, K, Ca, Mg and S, B, Cl, Cu, Fe, Mn, Mo, Zn, Ni, C, H and O, respectively (FAQUIN, 2005)

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