A Quantitative Management of Potassium Supply for Hydroponic Production of Low-Potassium Cherry-Type Tomato Fruit for Chronic Kidney Disease Patients

Abstract

Chronic kidney disease (CKD) has been a global health problem in recent years. CKD patients often restrict their potassium (K) intake to avoid the high risk of hyperkalemia. In this study, quantitative K management in hydroponics was adopted to produce low K cherry-type tomato (Solanum lycopersicom L.) fruit. The total quantity of K supply per plant during the cultivation was 7.2 g (1 K), 3.6 g (1/2 K), 1.8 g (1/4 K), 0.9 g (1/8 K) and 0.6 g (1/12 K), respectively. The total fruit yield decreased to about 75% at 1/2 K and 58% at 1/12 K compared to 1 K. The fruit K content was lower in 1/4 K, 1/8 K and 1/12 K than in 1 K and 1/2 K, and the fruit from 1/8 K and 1/12 K achieved below 100 mg 100 g−1 FW of K. Total soluble solid content (Brix) was 7–8% in 1 K and 1/4 K but was lower in 1/8 K and 1/12 K. Fruit acid content decreased to 87% in 1/2 K to 70% in 1/4 K and 1/8 K, and to 57% in 1/12 K of 1 K. In conclusion, quantitative K management in hydroponics is expected to produce low K tomato fruit. Fruit K content of approximately 100 mg.100 g−1 FW was achieved when the quantity of K supply was 1/4 K and 1/8 K, with a relatively smaller effect on fruit yield, Brix and acid content.

Soilless cultivation systems to produce tailored microgreens for specific nutritional needs

“…The main purpose of the second experiment was to provide subjects with impaired kidney function an alternative food product (K-reduced microgreens) to limit K intake. Similarly to the first experiment, the agronomic trial was conducted in a commercial greenhouse to verify how the extensively documented experimental protocols from other studies 7,8,[33][34][35] can be readily applied in a commercial greenhouse context.…”

Growth and Nutrient Utilization in Basil Plant as Affected by Applied Nutrient Quantity in Nutrient Solution and Light Spectrum

“…However, the shoot fresh and dry weights showed no increase with the increase in ANQ. Similarly, in another study, the absorption of K by tomato was increased with the increase in applied potassium quantity; however, the leaf dry weight of tomato did not increase with the increased absorption of potassium [24]. The absorption of excess nutrients that cannot be converted into biomass is known as luxury absorption [18,19], which causes the waste of nutrients.…”

“…QNM is more beneficial than the EC management method for the future development of hydroponics in terms of saving resources and regulating vegetable quality. In recent years, QNM has been applied to control the yield and quality of vegetables [ 5 , 24 ].…”

“…The shoot dry weight of tomato was decreased with the decrease in ANQ [ 25 ]. In another study, the leaf dry weight of tomato remained unaffected by different applied potassium quantities, and the potassium absorption increased with the increase in applied potassium quantity [ 24 ]. The shoot fresh and dry weights of lettuce were decreased with the decrease in applied nitrate quantity, and the nitrate absorption decreased with the decrease in applied nitrate quantity [ 5 ].…”

Formulação de rações versáteis para ajuste da relação N:P:K em sistemas de aquaponia: desempenho e higidez de juvenis de tilápia-do-Nilo (>i<Oreochromis niloticus>/i<), e qualidade e quantidade na produção de biomassa de alface

“…Além disso em concentrações abaixo do recomendado para as culturas, podem causar alterações nos metabólitos secundários, resultando em aumentos de polifenóis, alcaloides e glucosinolatos nas plantas (HAFSI et al, 2017;SON et al, 2021). Para evitar que a deficiência de K cause danos às culturas, é recomendado a disponibilidade de 7 mg de K na solução para cada 1 mg de K absorvido pelos vegetais (TSUKAGOSHI et al, 2021).…”