Efeito de doses de boro no crescimento vegetativo de girassol em diferentes classes de solos

Abstract

Effect of boron levels in vegetative growth of sunflower in different soil classesThe low availability of boron (B) in the soil is one of the limiting factors for the production of sunflower, which is an oleaginous plant characterized by broad climatic adaptability. The objective of this study was to evaluate the influence of boron rates applied in different soil classes on the development of sunflower cultivar Helium 863. The samples were collected in the layer 0-20 cm of the soil classes Gray Argisol -GL, Red Yellow Argisol -RYA, Litholic Neosol -LN, Eutrophic Red Argisol -ERA, Fluvic Neosol -FN and Haplic Vertisol -HV. The experiment was arranged in a randomized block 4 x 6 factorial (soils x doses) design, with four replications. The experimental unit was represented by one plant per pot. The soils showed significant effect (p <0.01) for all growth parameters studied. The sunflower plants grown in the soils FN, HV, GL and LN showed the highest leaf area, the largest inflorescence diameter, the highest levels of foliar boron, largest number of leaves and highest plant height, respectively. Fertilization with boron did not influence the production of dry matter of sunflower cv. Helium 863.

Sunflower subjected to boron doses in the semi-arid from Northern Minas Gerais, Brazil

“…However, the response to the B increase can vary between genotypes; with the variety BR 122 and the hybrids Aguará and Gurupi having the largest capitulum diameter when nourished with 3 kg ha -1 of B * p < 0.05. ( Capone et al, 2016), while in contrast, the varieties Embrapa 122/V-2000, Leila and Hélio 863 did not significantly respond to doses of B (Santos Junior et al, 2011;Euba Neto et al, 2014;Khalid et al, 2020).…”

“…Oliveira et al (2009) state that there is a difference in interactions among genotypes of the same species, causing divergence in the absorption of nutrients . Varieties Embrapa 122/V-2000 and Hélio 863 did not significantly respond to the boron doses regarding the number of leaves (Santos Junior et al, 2011;Euba Neto et al, 2014).…”

“…In the BRS 323 genotype, no significant effect of fertilization with B took place, with an estimated mean of 1.74 m. The behavior difference between same-species genotypes, under similar cultivation conditions and from the same harvest, can provide a distinction in the absorption and accumulation of nutrients, resulting in variations in the agronomic characteristics, such as the height (Jardini et al, 2014). The BR 122 variety alongside with the Aguará and Gurupi hybrids demonstrated the highest heights found when 3 kg ha -1 of B were provided (Capone et al, 2016), on the other hand, the varieties Hélio 863 and Leila did not obtain height gains from the doses of B (Euba Neto et al, 2014;Khalid et al, 2020).…”