Nutrient uptake, production and quality of Rosa hybrida in rockwool as affected by electrical conductivity of the nutrient solution

1990 ◽  
pp. 519-523 ◽  
Author(s):  
C. De Kreij ◽  
T. H. J. M. Van Den Berg
Keyword(s):  
Electrical Conductivity ◽  
Nutrient Uptake ◽  
Nutrient Solution ◽  
Rosa Hybrida

ELECTRICAL CONDUCTIVITY OF NUTRIENT SOLUTION, PLANT GROWTH AND FRUIT QUALITY OF SOILLESS GROWN TOMATO

2001 ◽  
pp. 503-508 ◽  
Author(s):  
A. Elia ◽  
F. Serio ◽  
A. Parente ◽  
P. Santamaria ◽  
G. Ruiz Rodriguez
Keyword(s):  
Electrical Conductivity ◽  
Plant Growth ◽  
Nutrient Solution ◽  
Fruit Quality

scholarly journals PEG-8000 Alters Morphology and Nutrient Concentration of Hydroponic Impatiens

HortScience ◽  
2005 ◽  
Vol 40 (6) ◽  
pp. 1768-1772 ◽  
Author(s):  
Stephanie Burnett ◽  
Marc van Iersel ◽  
Paul Thomas
Keyword(s):  
Electrical Conductivity ◽  
Polyethylene Glycol ◽  
Nutrient Uptake ◽  
Plant Height ◽  
Nutrient Solution ◽  
Nutrient Concentration ◽  
Nutrient Deficiency ◽  
Foliar Tissue ◽  
Impatiens Walleriana ◽  
Peg 8000

Osmotic compounds, such as polyethylene glycol 8000 (PEG-8000), reduce plant elongation by imposing controlled drought. However, the effects of PEG-8000 on nutrient uptake are unknown. Impatiens `Dazzler Pink' (Impatiens walleriana Hook. F.) were grown hydroponically in modified Hoagland solutions containing 0, 10, 17.5, 25, 32.5, 40, 47.5, 55, or 62.5 g·L–1 PEG-8000. Impatiens were up to 68% shorter than control plants when grown with PEG-8000 in the nutrient solution. Plants treated with PEG-8000 rates above 25 g·L–1 were either damaged or similar in size to seedlings treated with 25 g·L–1 of PEG-8000. Impatiens leaf water potentials (Ψw) were positively correlated with plant height. PEG-8000 reduced the electrical conductivity of Hoagland solutions as much as 40% compared to nontreated Hoagland solutions, suggesting that PEG-8000 may bind some of the nutrient ions in solution. Foliar tissue of PEG-treated impatiens contained significantly less nitrogen, calcium, zinc, and copper, but significantly more phosphorus and nickel than tissue from nontreated impatiens. However, no nutrient deficiency symptoms were induced.

Growth, nutrient uptake and tipburn severity of hydroponic lettuce in response to electrical conductivity and K:Ca ratio in solution

1994 ◽  
Vol 45 (1) ◽  
pp. 251 ◽  
Author(s):  
DO Huett
Keyword(s):  
Electrical Conductivity ◽  
Nutrient Uptake ◽  
Nutrient Solution ◽  
Growth Period ◽  
Vegetable Crops ◽  
Standard Formulation ◽  
Fresh Weight ◽  
Concentration Maximum ◽  
Young Leaves ◽  
Number Of Leaves

A commercial hydroponic nutrient solution formulation was developed to reflect the high K:N uptake of a range of vegetable crops (Huett and Dettmann, Aust. J. Agric. Res. 1992, 43, 1653-65). This standard formulation had a K:N ratio of 1.7: 1.0 and a K:Ca ratio of 1.25 : 1 00 (equivalent weight basis). Head lettuce cv. Coolguard and cv. Fame and non-heading cv. Red Mignonette were grown in recirculating culture to maturity with the standard formulation to examine the effect of electrical conductivity (EC) (0.4-3.6 dS m-l) and, for the latter two cultivars, nutrient formulation K: Ca ratio (from 1.00:3.50 to 3.50: 1-00) on growth, nutrient uptake and tipburn severity. Plants grown at an EC of 0.4 dS m-l were N and K deficient, while recently matured leaves and youngest leaves contained the highest Ca concentrations which decreased with increasing EC. When cv. Coolguard was grown at an EC of 1.0 dS m-l, N and K deficiency was eliminated and leaves contained the highest Ca concentration. Maximum fresh weight of leaf and head was recorded at 1-6 dS m-' and the decline in nutrient solution N and K concentrations over the growth period was 13 and 42% respectively. An increase in the K: Ca ratio of the formulation increased (P < 0-05) leaf by 13% and leaf+head fresh weight at maturity by 10% for cv. Fame whereas, for cv. Red Mignonette, a reduction in the K : Ca ratio increased ( P < 0.05) leaf fresh weight by 29% compared with the standard formulation. A reduction in the K : Ca ratio increased ( P < 0.05) the Ca concentration in the youngest leaves of cv. Fame and of cv. Red Mignonette at 1.6 and 3.6 dS m-l. Leaf K concentrations were generally reduced ( P < 0.05) by low EC and low K:Ca ratio. Hot conditions led to tipburn developing in cv. Red Mignonette at the 2 week harvest. The number of leaves plant-1 with tipburn at maturity (week 3) was reduced ( P < 0.01) from 23.1 to 4.4 as EC was reduced from 3.6 to 0 - 4 dS m-1 and was reduced ( P < 0 05) from 15.2 to 12.3 as the nutrient formulation K : Ca ratio was reduced from 3.5 : 1.0 to 1.25 : 1.00. Over the last week of the growth period, the number of leaves with tipburn remained stable at an EC of 0-4 dS m-l whereas, at 3.6 dS m-l, the number of leaves with tipburn increased by 253%. Tipburn developed in young leaves of cv. Red Mignonette which had a Ca concentration range from 1.7 to 3.2 g kg-1 and was generally absent from recently matured leaves which had a Ca concentration of 11.0 g kg-1. Young leaves of the tolerant cv. Fame had a Ca concentration of 5-9 g kg-1.

Effects of hydroponic solution composition, electrical conductivity and plant spacing on yield and quality of strawberries

1994 ◽  
Vol 34 (4) ◽  
pp. 529 ◽  
Author(s):  
RA Sarooshi ◽  
GC Cresswell
Keyword(s):  
Electrical Conductivity ◽  
Nutrient Solution ◽  
Fruit Set ◽  
Management Strategies ◽  
Calcium Nitrate ◽  
Planting Density ◽  
Plant Spacing ◽  
Marketable Yield ◽  
Yield And Quality

The influence of nutrient solution adjustment and replacement (management), its electrical conductivity (EC) and plant spacing on yield and quality of strawbeny fruit (var. Torrey) produced in a recirculating hydroponic system was studied at Gosford, New South Wales. Four ways of managing the nutrient solution were examined: (i) pH and EC adjusted daily and the solution replaced every 8 weeks (current grower practice); (ii) as above except that a topping up solution with lower potassium to nitrogen (K: N) ratio was used for EC adjustment; (iii) no daily adjustment of EC or pH and one-third of solution replaced every 2 weeks; and (iv) no daily adjustment of solution volume, EC or pH and full replacement after 8 weeks. Compared with grower practice, these alternative solution management strategies provided no advantage in yield, fruit number, or in the �Brix, citric acid, sweetness or flavour of fruit. Use of a topping up solution supplemented with ammonium nitrate (NH4NO3) and calcium nitrate [Ca(NO3)2] to reduce the K : N ratio from 1.7:1.0 to 1.4:1.0 had no effect (P>0.05) on yield but significantly increased (P<0.05) berry weight and improved fruit aroma. Regardless of which method of nutrient solution adjustment and replacement was used, the chemical composition of the recirculating solution changed markedly over 53 days. The method of nutrient solution management significantly (P<0.05) affected leaf phosphorus (P), calcium (Ca), magnesium (Mg), manganese (Mn), and zinc (Zn) but only Mg fell to a suboptimal level for growth of strawberries. Reducing the EC of the nutrient solution from 3 to 2 dS/m at early fruit set gave heavier (P<0.05) berries compared with constant EC of 2 dS/m. Increasing the EC from 2 to 3 or reducing it from 3 to 2 at early fruit set resulted in sweeter (P<0.05) berries and reducing the EC from 4 to 2 improved fruit aroma. Yield declined (P<0.05) when EC was increased from 2 to 4 dS/m. Solution EC bad significant effects (P<0.05) on leaf P, Mg, Mn and Zn. An increase in planting density from 5.35 to 9.35 plants/m2 lowered (P<0.05) marketable yield per plant and fruit acidity but gave 41% higher (P<0.05) yield on an area basis.

scholarly journals Silicon attenuates calcium deficiency by increasing ascorbic acid content, growth and quality of cabbage leaves

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dalila Lopes da Silva ◽  
Renato de Mello Prado ◽  
Luis Felipe Lata Tenesaca ◽  
José Lucas Farias da Silva ◽  
Ben-Hur Mattiuz
Keyword(s):  
Ascorbic Acid ◽  
Nutrient Solution ◽  
Acid Content ◽  
Dry Matter ◽  
Ascorbic Acid Content ◽  
Calcium Deficiency ◽  
Ca Deficiency ◽  
Leaf Water Loss ◽  
Nutrient Solutions

AbstractCalcium (Ca) deficiency in cabbage plants induces oxidative damage, hampering growth and decreasing quality, however, it is hypothesized that silicon (Si) added to the nutrient solution may alleviate crop losses. Therefore, this study aims at evaluating whether silicon supplied in the nutrient solution reduces, in fact, the calcium deficiency effects on cabbage plants. In a greenhouse, cabbage plants were grown using nutrient solutions with Ca sufficiency and Ca deficiency (5 mM) without and with added silicon (2.5 mM), arranged as a 2 × 2 factorial in randomized blocks, with five replications. At 91 days after transplanting, the plants were harvested for biological evaluations. In the treatment without added Si, Ca deficiency promoted oxidative stress, low antioxidant content, decreased dry matter, and lower quality leaf. On the other hand, added Si attenuated Ca deficiency in cabbage by decreasing cell extravasation while increasing both ascorbic acid content and fresh and dry matter, providing firmer leaves due to diminished leaf water loss after harvesting. We highlighted the agronomic importance of Si added to the nutrient solution, especially in crops at risk of Ca deficiency.

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