RESPONSE OF BEET TO DOSES OF POTASSIUM IN OXISOL WITH HIGH CONTENT OF THE NUTRIENT

• Autor(a) principal: Passos, Danilo dos Reis Cardoso
• Data de Publicação: 2020
• Outros Autores: Cecílio Filho, Arthur Bernardes, Reis, Isaias dos Santos, Pereira, Breno de Jesus
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Caatinga
• DOI: 10.1590/1983-21252020v33n314rc
• Texto Completo: https://periodicos.ufersa.edu.br/caatinga/article/view/9243
• topic: Beta vulagaris L.. Adubação potássica. Nutrição mineral. Acúmulo de nutrientes.; Beta vulgaris L.. Potassium fertilization. Mineral nutrition. Nutrient accumulation.

Fertiliser recommendation tables for beet culture have been prepared based on the response to potassium (K) doses in soils with a low nutrient content. However, there is little research that evaluates potassium fertilisation for beet crops in soil with high K content, a condition commonly found, which allows a better understanding of the crop’s response to the nutrient. The objective was to evaluate the response of beet to doses of K in Oxisol with a high K content. The experiment was carried out in the field, with an experimental design in randomised blocks, in a 4 x 2 factor scheme with four replications. The doses of K were 0, 60, 120 and 180 kg ha-1 of K2O, and the cultivars were ‘Early Wonder’ and ‘Kestrel’. At 50 days after transplantation, the levels of nitrogen (N), phosphorus (P), K and boron (B) in the diagnostic leaf were evaluated. Beet yield and accumulation of these four nutrients were analysed at harvest. The doses of K positively influenced the leaf content of K; however, without an effect on beet yield. Therefore, in Oxisol with a high K content available, potassium fertilisation is not recommended. To maintain soil fertility at a high potassium content, fertilisation with 162 and 126 kg ha-1 of K2O is recommended for ‘Early Wonder’ and ‘Kestrel’, respectively; doses equivalent to the quantities exported by the beet root.