Impact of reduced potassium nitrate concentrations in nutrient solution on the growth, yield and fruit quality of melon in hydroponics

Asao, Toshiki; Asaduzzaman, Md.; Mondal, Md. Fuad; Tokura, M.; Adachi, Fumihiko; Ueno, Makoto; Kawaguchi, Mikiko; Yano, Shozo; Ban, Takuya

doi:10.1016/j.scienta.2013.09.045

Cited by 41 publications

(47 citation statements)

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“…A general trend of decreasing K content in fruit was observed with decreasing KNO 3 concentrations in the nutrient solution. These results are in accordance with the study of Asao et al (2013) in which the K of melon fruit decreased with decreasing KNO 3 levels in the nutrient solution. The reduction of K in the fruit may have been due to its low absorption by the x Means within a column followed by different letters are significantly different according to Tukey's multiple range test at P < 0.05 (n = 15).…”

Section: Discussionsupporting

confidence: 92%

“…Na and Ca concentrations of strawberry fruits significantly varied with different treatments (Table 6). Asao et al (2013) also found that a reduced level of KNO 3 in the nutrient solution increased the Na content in melon fruit. A reduced level of KNO 3 with Ca(NO 3 ) 2 adjustment increased the Ca contents of mid-and final-stage fruit and the Na content in mid-stage fruit (Table 6).…”

Section: Discussionmentioning

confidence: 82%

“…Reducing this level in strawberry fruit would provide a good option in the diet for CKD patients. Asao et al (2013) reported that a reduction in KNO 3 in hydroponic solution could reduce the K concentration in melon fruit. Therefore, the objective of the present study was to investigate the impact of reduced K concentration in nutrient solution on the fruit K content of strawberries, while maintaining normal growth, yield, and other indicators of fruit quality.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of Potassium (K) Content in Strawberry Fruits through KNO3 Management of Hydroponics

et al. 2017

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The consumption of vegetables and fruits rich in potassium (K), such as melons and strawberries, is restricted in chronic kidney disease (CKD) patients. Therefore, we attempted to produce low-K strawberry fruits through management of a KNO 3 fertilizer in nutrient solution from anthesis to the harvest period. A general trend of decreasing K content in fruit was observed with the decrease of KNO 3 concentration in the nutrient solution. Among four strawberry cultivars, the fruit of the 'Toyonoka' exhibited a K reduction of about 64% when plants were grown in nutrient solution with KNO 3 at 1/16 of the normal level. Citric acid and ascorbic acid contents of 'Toyonoka' fruit were reduced with decreasing KNO 3 concentrations in the nutrient solution. Although the reduced NO 3 − of the nutrient solution was adjusted by using Ca(NO 3 ) 2 to obtain low-K strawberries, growth, yield, and quality did not vary with this adjustment. Compared with the typical level of K in strawberry fruit of 170 mg/100 g FW (Standard Tables of Food Composition in Japan, 2011), a 23.5% decrease (130 mg/100 g FW) in K was found in 1/32 level of KNO 3 . The K contents of plant parts suggested that the low KNO 3 level was responsible for the low K absorption, which may have affected the translocation and accumulation of K into fruit. Therefore, 1/32 level of KNO 3 in nutrient solution lowers the fruit K content considerably.Key Words: chronic kidney disease, Fragaria × ananassa Duch. 'Toyonoka', fruit potassium content, potassium nitrate, potassium translocation. IntroductionPotassium (K) is a major electrolyte in the human body. It plays an important role in the contraction or relaxation of skeletal, smooth, and cardiac muscles, nerve impulse transmission, acid base equilibrium, enzymatic action, intracellular fluid tonicity, and renal function (Crawford and Harris, 2011;Russell, 2009). The average daily K intake is estimated to be 2000-3900 mg·day −1 (Choi and Ha, 2013;Kes, 2001; Putcha Received; September 16, 2015. Accepted; March 6, 2016. First Published Online in J-STAGE on April 23, 2016. * Corresponding author (E-mail: asao@life.shimane-u.ac.jp).and Allon, 2007). About 77% of dietary K is excreted in the urine via the kidneys (Holbrook et al., 1984). A study found that higher K excretion is associated with a reduction in the risk of adverse renal outcomes (Smyth et al., 2014), but patients with chronic kidney disease (CKD) have limited ability to excrete K through the kidneys. As a result, the level of K increases in the blood serum. An elevated level of K in serum is called hyperkalemia, and is associated with an increased risk of chronic kidney disease progression and all-cause mortality in patients with chronic kidney disease . Mills et al. (2014) found that high dietary K was associated with an increased risk of cardiovascular disease among patients with CKD. In the United States, hyperkalemia causes 5 deaths/1000 person-years in patients with CKD (US Renal Data System, 2002). The number of CKD patients is continuing to increase g...

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Reduction of Potassium (K) Content in Strawberry Fruits through KNO3 Management of Hydroponics

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“…It has been reported that changes in the potassium supply to a growing plant can cause significant alterations of the potassium content in the melon plant tissues (Asao et al, 2013). In the present study, the potassium content in the outer leaves of three lettuce types was significantly decreased under a reduced potassium regime (Fig.…”

Section: Discussionsupporting

confidence: 55%

“…139°90' E) on 13 May, 2015, and were harvested on 3 June, 2015 for green leaf lettuce, on 5 June, 2015 for Boston lettuce, and on 7 June, 2015 for romaine lettuce. For the entire period of the experiment in the greenhouse, the mean air temperatures were 25/20°C (day/night), relative humidity 70%, and average light intensity (on the cultivation beds) 500 μmol·m Asao et al, 2013). Reduced potassium treatments (keeping all other nutrient contents constant) were conducted from the transplanting day, with NaNO 3 used to replace KNO 3 in nutrient solutions.…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

Plant Growth and Photosynthesis Response to Low Potassium Conditions in Three Lettuce (Lactuca sativa) Types

Zhong¹,

Johkan²,

Hohjo³

et al. 2017

The Hortic J

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Chronic kidney disease has become a major public health problem worldwide. The aim of this study was to investigate the differences in plant growth and photosynthesis among three lettuce (Lactuca sativa) types with different morphological characteristics under low potassium conditions, providing information for improving the method of low-potassium lettuce culture. Lettuce was hydroponically grown in half-strength Enshi formula nutrient solution containing 4, 2, or 1 me·L In green leaf lettuce, reductions in both the net assimilate rate (NAR) and leaf area ratio (LAR) led to a decline in RGR. In Boston lettuce and romaine lettuce, the reduction of RGR was mainly due to a reduction in LAR, and to a lesser extent caused by NAR. Reduced potassium in the nutrient solution had a greater effect on mature leaves than on newly expanded leaves for all three lettuce types. In green leaf lettuce and Boston lettuce, photosynthetic rates of mature leaves significantly decreased under reduced potassium treatments, with a steady or gradually increased intercellular CO 2 concentration; this indicated that non-stomatal factors suppressed photosynthesis. In romaine lettuce, the photosynthetic rate was less influenced by reduced potassium levels in the nutrient solution, and the significant increase observed in leaf mass per area might contribute to maintaining photosynthesis in the leaf. The decrease in photosynthesis in mature leaves exhibited a similar trend to the decreased potassium content in the leaves within the three lettuce types, but the factor related to the reduction of photosynthesis was different.

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Effects of alternative cropping systems on globe artichoke qualitative traits

et al. 2017

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Impact of reduced potassium nitrate concentrations in nutrient solution on the growth, yield and fruit quality of melon in hydroponics

Cited by 41 publications

References 32 publications

Reduction of Potassium (K) Content in Strawberry Fruits through KNO<sub>3</sub> Management of Hydroponics

Reduction of Potassium (K) Content in Strawberry Fruits through KNO<sub>3</sub> Management of Hydroponics

Plant Growth and Photosynthesis Response to Low Potassium Conditions in Three Lettuce (<i>Lactuca sativa</i>) Types

Effects of alternative cropping systems on globe artichoke qualitative traits

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