Biometric and physiological relationships and yield of sugarcane in relation to soil application of potassium

Andrade, Aline Franciel de; Flores, Rilner Alves; Casaroli, Derblai; Bueno, Amanda Magalhães; Souza, Marco Aurélio Pessoa de; Jardim, Carlos Cesar Silva; Abdala, Klaus de Oliveira; Marques, Eduardo Parra; Mesquita, Marcio

Biometric and physiological relationships and yield of sugarcane in relation to soil application of potassium

Data

2022-04

Autores

Andrade, Aline Franciel de

Flores, Rilner Alves

Casaroli, Derblai

Bueno, Amanda Magalhães

Souza, Marco Aurélio Pessoa de

Jardim, Carlos Cesar Silva

Abdala, Klaus de Oliveira

Marques, Eduardo Parra

Mesquita, Marcio

Resumo

This study evaluates the effect of the soil application of potassium (K) on the physiological, productive, and economic variables of the first sugarcane ratoon grown in the Brazilian Central region. The experiment was arranged in a randomized complete block design, with five replicates. Treatments consisted of five doses of K (0; 41.5; 83.0; 124.5; and 166.0 kg ha−1). K contents in the soil, biometric variables, relative chlorophyll index, gas exchange parameters, and stem and sugar yield were evaluated. Soil application of K increased the K content in the soil with quadratic adjustment at depths from 0.0 to 0.2 m, with the maximum content of 0.38 cmolc dm−3 when 164.3 kg K ha−1 was applied. The significant adjustment was linear at the depths from 0.2–0.4 and 0.6–0.8 m, reaching 0.27 and 0.11 cmolc dm−3, respectively, for the highest dose applied. The application of K did not affect plant height in any of the periods evaluated, although affecting the number of tillers and leaf area at 120 DAB, reaching higher values at the dose of 166.0 kg K ha−1. Stomatal conductance, transpiration, photosynthesis, and internal CO2 concentration were affected by the increased application of K, with the dose of approximately 83.0 kg ha−1 resulting in the highest values. The dose of 166.0 kg K ha−1 obtained the best stem and recoverable sugar yields, 135.4 t ha−1 and 18.6 t ha−1, respectively, also obtaining the highest differential profit, US$ 425.8, in relation to the non-application of K fertilizer.

Palavras-chave

Differential profit, Gas exchange, Potassium Saccharum spp., Sugar yield

Citação

ANDRADE, Aline Franciel de et al. Biometric and physiological relationships and yield of sugarcane in relation to soil application of potassium. Sugar Tech, [s. l.], v. 24, p. 473–484, 2022. DOI: 10.1007/s12355-021-01032-z. Disponível em: https://link.springer.com/article/10.1007/s12355-021-01032-z. Acesso em: 18 nov. 2024.