Foliar Applied Potassium: Effects on Cantaloupe Quality (original) (raw)
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Plants
This is the first report to study the impacts of potassium sources on apricot fruit yield, quality and storability as a preharvest foliar application. Five sources of potassium (K-humate, K-sulphate, K-nitrate, K-silicate and K-citrate), plus water as a control treatment, were applied individually at 0.2% three times on ‘Canino’ apricot over the 2019 and 2020 seasons. The results showed that all potassium salts, applied foliarly, have potential to improve yield, fruit color, and some fruit physical attributes, such as: weight, size and firmness, as well as a reduced lipid peroxidation, accompanied by a low fruit malondialdehyde content reflected in a high tolerance during storage. The K-nitrate treatment was more effective in the improvement of fruit yield, preharvest quality parameters and keeping fruit postharvest quality characteristics from sharp decline during cold storage. Concerning fruit anatomy, K-nitrate and K-citrate showed thicker cuticle and epidermal parenchyma cell di...
2000
Netted muskmelon (Cucumis melo L. (Reticulatus Group)) fruit quality (ascor- bic acid, `-carotene, total free sugars, and soluble solids concentration (SSC)) is directly related to plant potassium (K) concentration during fruit growth and maturation. During reproductive development, soil K fertilization alone is often inadequate due to poor root uptake and competitive uptake inhibition from calcium and magnesium. Foliar applica- tions
FOLIAR APPLICATION OF POTASSIUM IMPROVES FRUIT QUALITY AND YIELD OF TOMATO PLANTS
Tomato is well known regarding its quality and nutritional value in all over the world but imbalances of fertilizer nutrients severely affect the quality of tomato. To investigate the specific contribution of potassium to yield and quality of tomato, a field experiment was conducted on two tomato cultivars, Nagina and Roma. Foliar application with varying levels (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0%) of potassium solutions was applied to the plants and compared with control (without K). Exogenous application of 0.6% K significantly improved plant height, lycopene content, potassium, fruit weight and diameter. Exogenous application of 0.5, 0.6 and 0.7% K maximally improved ascorbic acid contents of both tomato cultivars whereas 0.4 and 0.8% did not improve ascorbic acid contents. Due to positive correlation between K nutrition and fruit quality attributes, exogenous application of an appropriate K level can contribute to higher yield and better quality of tomato fruits. Among all potassium levels, 0.5-0.7% K maximally improved performance of tomato plants of both cultivars.
(46) Foliar-applied Potassium: Effects on Muskmelon Quality, Sugar, Ascorbic Acid, and Beta-carotene
HortScience
Muskmelonfruit[Cucumis melo L. (Retiulatus Goup)] sugar content is related to potassium (K)-mediated phloem loading and unloading of sucrose into the fruit. During fruit growth and maturation, soil fertility is often inadequate (due to poor root uptake) to satisfy the demand for K. Potassium uptake also competes with the uptake of Ca and Mg, two essential minerals needed for melon fruit membrane structure, function and postharvest shelf-life. Supplemental foliar-applied K could alleviate this problem especially during the critical fruit growth/maturation period. We conducted experiments to determine the effects of timing of supplemental foliar K applications on fruit quality and health attributes of orange-flesh muskmelon `Cruiser'. Plants were grown in a greenhouse and fertilized with a regular soil-applied N–P–K fertilizer throughout the study. Entire plants, including the fruit were sprayed with a solution of a novel glycine amino acid-complexed potassium (Potassium Metalosat...
Effects of Foliar Potassium Fertilization on Muskmelon Fruit Quality and Yield 1
Sugar content, aroma and texture are key quality traits that influence consumer preference of many fruits and vegetables such as muskmelon (Cucumis melo L. (Reticulatus Group)). These quality traits are directly related to potassium (K)-mediated processes. However, soil-derived K alone is seldom adequate to satisfy these fruit quality processes. Controlled environment studies have shown that supplemental foliar K applications can overcome this apparent deficiency. However, the suitability of potential K salts as foliar sources is still uncertain. We evaluated six foliar K sources (potassium chloride - KCl, potassium nitrate - KNO3, monopotassium phosphate - MKP, potassium sulfate - K2SO4, potassium thiosulfate - KTS , and a glycine amino acid-complexed K- Potassium Metalosate, KM) for effects on fruit quality parameters of field- grown muskmelon 'Cruiser' over two growing seasons, 2006 and 2007 in Weslaco, south Texas. Weekly foliar K applications were initiated at fruit s...
Acta horticulturae, 2015
Cadoux' clementine is a citrus fruit well appreciated by consumers. However, this cultivar produces fruits of small to medium size that are fairly accepted commercially. In a field study, we evaluated the effects of rates and frequencies of foliar potassium (K) fertilization, applied either as potassium nitrate (KNO 3) or potassium sulfate (K 2 SO 4), on fruit production (fruit size, weight and yield) and quality parameters (skin thickness, firmness, color index, maturity index, juice content, acidity and total soluble sugars). Concentrations of foliar fertilizer solutions were 5 and 8% (m/v) for KNO 3 , and 2.5 and 4% (m/v) for K 2 SO 4 , applied either two or three times during fruit growth on orchards with three planting densities (D1: 6×6 m, D2: 5×6 m and D3: 6×3.5 m tree spacing). In all treatments, after potassium sprays, K (% DM) content increased in the leaves of clementine 'Cadoux' between 12 and 40% compared to their initial K levels while in the control this content dropped about 15% compared to its initial content (before K sprays). Fruit weight increased with K application rate and frequency. K fertilization treatments in three foliar applications showed the best percentages of fruits of extra size class, whatever the source of K (KNO 3 or K 2 SO 4) or plant density. Foliar applications of K also increased fruit color, firmness and rind thickness. Fruit juice content, acidity and total soluble solids slightly increased with foliar K application. Raising K concentration and the number of foliar applications increased tree fruit production. In terms of efficiency of foliar K fertilizers, 4% K 2 SO 4 in three applications resulted in maximum gain of fruits per kg of foliar fertilizer.