Effect of different macronutrient cation ratios on macronutrient and water uptake by melon (Cucumis melo) grown in recirculating nutrient solution

Root and foliar absorption and translocation of14C-metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] were determined in tolerant (‘Steptoe’) and susceptible (‘Morex’) barley (Hordeum vulgareL.) cultivars grown in nutrient solution culture under greenhouse conditions. Root-applied metribuzin toxicity to the two barley cultivars was also examined. A 50% reduction in growth occurred at 0.22 and 0.72 μM metribuzin for Morex and Steptoe, respectively. Root absorption was similar for both cultivars at 1 day, but Steptoe absorbed about two times more metribuzin 4 and 8 days after application than did Morex. Steptoe absorbed 19% of the total applied metribuzin by 8 days. Root absorption was positively correlated with water uptake (r≥ 0.87). Leaf absorption was three times greater for Morex than for Steptoe after 4 days. Transport to leaves from root application was rapid, and, by 1 and 8 days, leaves of Steptoe contained 71 and 82% and leaves of Morex 78 and 84% of the total absorbed14C, respectively. Translocation was apoplastic following both root and leaf absorption and was similar for both cultivars. Differential tolerance could partially be accounted for by differences in foliar absorption but not by differences in root absorption.

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Effect on Transpiration and Water Uptake by Rapid Changes in the Osmotic Potential of the Nutrient Solution

Physiologia Plantarum ◽

10.1111/j.1399-3054.1966.tb07045.x ◽

1966 ◽

Vol 19 (3) ◽

pp. 602-617 ◽

Cited By ~ 19

Author(s):

Stig Olof Falk

Keyword(s):

Water Uptake ◽

Nutrient Solution ◽

Osmotic Potential ◽

Rapid Changes

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Growth of melon cultivated in coconut fiber under different concentrations of nutrient solution

Comunicata Scientiae ◽

10.14295/cs.v9i3.2736 ◽

2018 ◽

Vol 9 (3) ◽

pp. 381-392

Author(s):

Christiano Rebouças Cosme ◽

Nildo Da Silva Dias ◽

Karen Mariany Pereira Silva ◽

John Lenon Vasconcelos Fonteles ◽

Marcelo Tavares Gurgel ◽

...

Keyword(s):

Growth Rate ◽

Nutrient Solution ◽

Cucumis Melo ◽

Aerial Part ◽

Coconut Fiber ◽

Relative Growth ◽

Standard Solution ◽

Cucumis Melo L ◽

Different Levels ◽

Nutrient Solutions

To evaluate the effects of applying different concentrations of the nutrient solution macronutrients in growth of melon cultivated in coconut fiber it was conducted this experiment uses the ‘Galia’ melon (Cucumis melo L., hybrid Babilonia RZ F1). The experimental design was a randomized blocks utilizing five treatments, which corresponded to different concentrations of macronutrients in nutritive solutions (corresponding to different levels of nutrient solution macronutrients) based on the standard solution for the melon proposed by Furlani: 100 (control), 75, 50, 25, and 12.5%, applied in five replications. The concentration of 50% provided higher production of dry matter of the aerial part and leaf area. The absolute aerial part growth rate showed different tendencies for levels being that concentration of 50% produced the best results. The relative growth rate of the aerial part and assimilation rate of the aerial part decrease with time for all concentrations of the nutrient solutions tested.

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Influence of day/night humidity and cation ratios and concentration in the nutrient solution on incidence of Didymella bryoniae in glasshouse cucumbers.

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v36i3.16673 ◽

1988 ◽

Vol 36 (3) ◽

pp. 225-230

Author(s):

N.A.M. van Steekelenburg ◽

G.W.H. Welles

Keyword(s):

Electrical Conductivity ◽

Disease Control ◽

Nutrient Solution ◽

Diseased Leaf ◽

Didymella Bryoniae ◽

Internal Rot ◽

Cation Ratios

The incidence of the disease on plants and fruits decreased with a lower 24 h av. RH in the range 80-87%. An increase in the electrical conductivity (EC) level of the nutrient solution from 2.5-5.0 dS/m (25 degrees C) decreased the number of diseased leaf axils at a Ca concn of 1.5 mmol/litre by 41%, but had no effect at a Ca concn of 4.5 mmol/litre. An increase in Ca concn from 1.5-4.5 mmol/litre decreased the number of diseased leaf axils at an EC level of 2.5 dS/m by 26%, but had no effect at an EC level of 5.0 dS/m. Changes in EC and Ca concn had no effect on the number of fruits with internal rot. It is concluded that to optimize disease control, high RH, low EC level and low Ca concn in the nutrient solution should be avoided. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Uptake of Mn and Zn by Cucumber Grown in Closed Hydroponic Systems as Influenced by the Mn and Zn Concentrations in the Supplied Nutrient Solution

HortScience ◽

10.21273/hortsci.48.3.373 ◽

2013 ◽

Vol 48 (3) ◽

pp. 373-379 ◽

Cited By ~ 6

Author(s):

Constantinos Tzerakis ◽

Dimitrios Savvas ◽

Nick Sigrimis ◽

Georgios Mavrogiannopoulos

Keyword(s):

Water Uptake ◽

Nutrient Solution ◽

Plant Biomass ◽

Climatic Conditions ◽

Zn Concentration ◽

Mn Content ◽

Hydroponic Systems ◽

Experimental Treatments ◽

Mn Concentration ◽

Supply Level

The objective of the present experiment was to estimate the uptake of manganese (Mn) and zinc (Zn) by cucumber in closed hydroponic systems at different Mn and Zn concentrations in the recycled nutrient solution under Mediterranean climatic conditions. The obtained data might be used to manage Mn and Zn supply in closed hydroponic crops of cucumber grown in Mediterranean greenhouses and avoid their accumulation to toxic levels. Four Mn levels (10, 40, 80, 120 μM) at a standard Zn concentration (6 μM) and four Zn levels (6, 20, 40, 60 μM) at a standard Mn concentration (10 μM) in the solution supplied to compensate for nutrient and water uptake by plants were applied as experimental treatments. The actual uptake concentrations of Mn and Zn were estimated by applying two different methods. The first method was based on the removal of Mn, Zn, and water from the recycling nutrient solution, whereas the second method was based on the total quantities of Mn and Zn that were recovered in plant biomass in combination with the total water uptake. Both methods gave similar uptake concentrations for Mn in the low-Mn supply level and Zn in all Zn levels. However, in the three higher Mn supply levels, the values estimated on the basis of nutrient removal from the recirculating nutrient solution were significantly higher than those found by measuring the total Mn content in plant biomass. These discrepancies in the three high-Mn treatments were possibly caused by partial immobilization of Mn by oxidizing bacteria in the nutrient solution.

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