Phosphate and potassium fertilization on agronomic and physico-chemical characteristics and bioactive compounds of eggplant

Abstract

Eggplant is a functional food rich in antioxidants and its consumption brings several benefits to human health. Phenolic compounds and anthocyanins are some of the compounds that interfere in this antioxidant capacity and may be influenced by the mineral nutrition of the plant. The objective was to analyze the effects of potassium and phosphate fertilization on the agronomic and physico-chemical characteristics and bioactive compounds of eggplant fruits. The work was carried out at the Taboquinha Farm, in the municipality of Baldim, MG, at coordinates 19º 17’ 12.5” S and 43º 54’ 01” W, from March to October 2017. The experimental design was randomized blocks in a 4 x 4 factorial scheme with four replicates. The factors under study were phosphorus and potassium represented by four doses of P2O5 (0, 60, 120 and 180 kg ha-1) and four doses of K2O (0, 25, 50 and 75 kg ha-1), respectively. It was concluded that potassium and phosphate fertilization did not improve the agronomic and physico-chemical characteristics of eggplant fruits; however, potassium fertilization in greater amounts promoted improvements in the contents of phenolic compounds. The lack of phosphorus increased the anthocyanin content in the fruits, but interfered negatively in their shape. Potassium and phosphate fertilizations produced antagonistic effects on fruit moisture content.

Prediction of Antioxidant Activity of Cherry Fruits from UAS Multispectral Imagery Using Machine Learning

“…The most interesting correlations for leaf analysis and antioxidant capacity of cherry fruits was the negative correlation of leaf boron content (L_B) with DPPH, validating the importance of soil boron on the antioxidant capacity of cherry fruits, and the correlation of leaf potassium content (L_K) with the FCR (Table 4). The latter agrees with Oliveira et al [23], who showed that potassium fertilization in greater amounts than optimum for maximum growth and yield, promoted the development of phenolic compounds in plants. Potassium levels were above the optimum for obtaining the maximum yield for almost all cherry trees in the two experimental areas (data not presented here).…”

Zinc oxide nanoparticles and bioinoculants on the postharvest quality of eggplant subjected to water deficit

“…However, the results of the current study surpassed those of other studies on eggplant cultivation (Radicetti et al, 2016;Çolak et al, 2018;Oliveira et al, 2019). Eggplant is one of the vegetables (fruits) with low acidity, with a pH greater than or equal to 4.5 (Oliveira et al, 2019). In the present study, pH values were above 4.9, and SS values ranged from 4.6 to 4.8.…”

“…According to Tukey's test, the treatments and irrigation percentages tested did not cause significant variation in the values of the studied variables, especially for pH, SS, TA, SS/ TA and firmness (Table 4). However, the results of the current study surpassed those of other studies on eggplant cultivation (Radicetti et al, 2016;Çolak et al, 2018;Oliveira et al, 2019). Eggplant is one of the vegetables (fruits) with low acidity, with a pH greater than or equal to 4.5 (Oliveira et al, 2019).…”

Produção De Pimenta Malagueta Submetida a Doses De Hidrogel E Lâminas De Irrigação

“…A prática da adubação torna-se um fator importante para se obter a qualidade desejada de sementes. A aplicação é positiva e exerce influência sobre processos bioquímicos e fisiológicos das plantas, contribuindo com a produção e qualidade das sementes, promove um melhor desenvolvimento vegetativo das plantas e melhores condições de suprimentos dos frutos e sementes que serão formados (OLIVEIRA et al, 2019).…”