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Fruit diameter, vitamin C and titratable acidity content of strawberry cultivars under different K levels of nutrient solution.
Source publication
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 cult...
Contexts in source publication
Context 1
... Parus cultivar fruit diameter was not affected by K levels of nutrient solution (Table 4). In Camarosa and Selva the significant maximum fruit diameter was in 350 mg L -1 K; however, the lowest fruit diameter of Camarosa was in control, and of Selva was in 600 mg L -1 K. Determination of fruit vitamin C content in three strawberry cultivars showed that fruit vitamin C was significantly influenced by K levels of nutrient solution (Table 4). ...
Context 2
... Parus cultivar fruit diameter was not affected by K levels of nutrient solution (Table 4). In Camarosa and Selva the significant maximum fruit diameter was in 350 mg L -1 K; however, the lowest fruit diameter of Camarosa was in control, and of Selva was in 600 mg L -1 K. Determination of fruit vitamin C content in three strawberry cultivars showed that fruit vitamin C was significantly influenced by K levels of nutrient solution (Table 4). In Camarosa and Selva, the changes of vitamin C were almost similar, in which the maximum fruit vitamin C was in 350 mg L -1 K and the significant lowest was in 600 mg L -1 K. ...
Context 3
... Camarosa and Selva, the changes of vitamin C were almost similar, in which the maximum fruit vitamin C was in 350 mg L -1 K and the significant lowest was in 600 mg L -1 K. In Parus cultivar, the maximum fruit vitamin C was in 450 mg L -1 K and the lowest value was in 600 mg L -1 K of nutrient solution (Table 4). Fruit titratable acidity was not affected by K levels in Camarosa and Selva cultivars, while in Parus the two maximum K levels (450 and 600 mg L -1 K) resulted in significantly higher titratable acidity than other two concentrations (Table 4). ...
Context 4
... Parus cultivar, the maximum fruit vitamin C was in 450 mg L -1 K and the lowest value was in 600 mg L -1 K of nutrient solution (Table 4). Fruit titratable acidity was not affected by K levels in Camarosa and Selva cultivars, while in Parus the two maximum K levels (450 and 600 mg L -1 K) resulted in significantly higher titratable acidity than other two concentrations (Table 4). ...
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Romaine lettuce (Lactuca sativa var. longifolia) was cultivated in a hydroponic system, in the free-standing
container equipped with two-shelf racks. The luminous intensity of the upper shelves was 200 μmol m 2 s 1,
and that of the bottom was 160 μmol m 2 s 1. The plants were exposed to light for 16 h each day. Seven cultivars
from two groups were cultivated in this study. There were four cultivars from the midi subtype (‘Casual,’
‘Pivotal,’ ‘Delcaso,’ and ‘Airton’) and three from the mini subtype (‘Xiomara,’ ‘Coventry,’ and ‘Elizium’). The
growth period of lettuce in the hydroponic chamber was 30 days. Immediately after harvest, lettuce was evaluated
for plant morphological parameters and for the content of macro- and microelements and metabolites with
health-promoting properties. Additionally, sensory evaluation was performed and leaf color parameters were
measured.
The genotype of romaine lettuce had a major impact on its extrinsic and intrinsic properties. The mini cultivars
produced lower fresh mass but contained higher amounts of nitrogen, phosphorus, potassium, copper, and boron
than varieties from the midi group. The contents of bioactive compounds were higher for midi romaine lettuce
than for the mini type. In terms of nitrate, there were significant differences, and lower nitrate levels occurred in
the mini group, except in ‘Coventry.’ The results obtained in this study did not allow us to single out any cultivar
from the midi group as the best or the worst in terms of chemical composition. Among the mini cultivars,
‘Elizium’ shown the tendency to accumulate a relatively small amount of nitrate and a relatively large amount of
chlorophyll, carotenoid, polyphenol and flavonoid. ‘Coventry’ with the lowest chlorophyll, carotenoid, and
flavonoid contents was found to be the poorest in bioactive compounds. The sensory evaluation indicated the
good quality of all mini and two midi cultivars, while ‘Delcaso’ (midi cultivar) received the worst marks, because
of poor smell and crispness and a bitter aftertaste. The higher light intensity (200 μmol m 2 s 1) used for plant
illumination did not unequivocally increase the content of health-promoting components or improve other
characteristics of romaine lettuce compared to the light 160 μmol m 2 s 1.
