Growth and Fruit Biochemical Characteristics of Three Strawberry Genotypes under Different Potassium Concentrations of Nutrient Solution

Abstract

A nutrient solution experiment was performed to evaluate the growth, yield and fruit biochemical characteristics of strawberry under different potassium levels of nutrient solution. Potassium concentrations including 235 (control), 350, 450 and 600 mg L-1 were applied to three strawberry genotypes of Camarosa, Selva and Parus under hydroponic culture. In the three genotypes, the maximum leaf area was observed at 350 mg L-1 K, and the maximum shoot fresh weight was either at 350 mg L-1 (in Camarosa and Parus) or at 400 mg L-1 (in Selva). In Selva, higher yield was produced by higher K concentrations than control (17-33%) and in Camarosa, the maximum yield was produced at 350 mg L-1 (16%), whereas fruit yield in Parus was not affected by K concentrations. In Selva and Parus application of 350 mg L-1 potassium produced more fruits than control. The maximum fruit vitamin C content in Camarosa and Selva was at 350 mg L-1, and in Parus at 450 mg L-1, while the significant lowest in three genotypes was at 600 mg L-1. Fruit titratable acidity and pH in Camarosa and Selva, and fruit TSS in Parus were not affected by K levels. Fruit total soluble solids (TSS) in Camarosa and Selva were maximum in 350 and 450 mg L-1. Increasing K concentrations of nutrient solution increased leaf and fruit K concentration than control. The results indicate that overall plant growth and fruit quality of three strawberry genotypes were increased by 350 mg L-1 potassium, while application of 600 mg L-1 reduced most traits than control. The Selva genotype had also a better response to higher concentration of K than two other genotypes.

Nitrogen and potassium supplied by phenological stages affect the carotenoid and nutritive content of the tomato fruit

“…Similar responses have been obtained when K is raised from 8 to 9 molc m -3 NS in tomato (Ramírez et al, 2012). In strawberries and pepper, increasing the K supply from 210 mg L -1 to 350 mg L -1 in the nutrient solution significantly increased key quality attributes of fruits (Tohidloo et al, 2018).…”

“…Potassium (K) has key roles in various physiological and biochemical processes in plants, including photosynthesis, osmoregulation, enzyme activity, secondary metabolism, protein biosynthesis, sugar transport and many quality traits of products (Oosterhuis et al, 2014;Pourranjbari Saghaiesh et al, 2018;Tohidloo et al, 2018). Likewise, in open field tomato cultivation, K doses from 0 to 60 and 120 kg ha -1 , or K levels of 200 to 400 mg L -1 in the hydroponic solution, increase the content of vitamin C, sugars, lycopene, and protein of the fruit (Almeselmani et al, 2009;Ahmad et al, 2015), although decreases in sugars (42 to 25 g) and vitamin C were also reported due to a K supply of 0 to 200 kg ha -1 (Ehsan- Akhtar et al, 2010).…”

Análisis nutricional y niveles de extracción del mango ‘Azúcar’ en el Departamento del Magdalena, Colombia

“…El K es crucial para muchas reacciones bioquímicas que son esenciales para la activación de enzimas y los procesos fisiológicos en la célula (Anees et al, 2016). El tamaño, la apariencia, el color, los sólidos solubles, la acidez, el contenido de vitaminas, el sabor y la vida útil de la fruta están significativamente influenciados por un suministro adecuado de K (Tohidloo et al, 2018). Extracción de nutrientes por la fruta.…”

Acidified Biochar Confers Improvement in Quality and Yield Attributes of Sufaid Chaunsa Mango in Saline Soil

“…The highest fruit sugar content was obtained from the treatment of 40 Mg/ha, which did not show a statistically significant difference with the level of 20 Mg/ha; the lowest sugar content was observed for the control treatment, which had no statistical difference from the level of 5 Mg/ha (Figure 5A,B). According to Tohidloo and Souri [58], plants use both active and passive mechanisms for the better uptake of B. However, under deficiency of B, xylem uptake is the most common pathway.…”