scholarly journals Rapid Sand Filtration of Recycled Irrigation Water Controlled Pythium Root Rot of Poinsettia in Greenhouse

2019 ◽  
Vol 29 (5) ◽  
pp. 578-589 ◽  
Author(s):  
Sangho Jeon ◽  
Charles S. Krasnow ◽  
Gemini D. Bhalsod ◽  
Blair R. Harlan ◽  
Mary K. Hausbeck ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Irrigation Water ◽  
Root Rot ◽  
Nutrient Deficiency ◽  
Sand Filtration ◽  
Growing Media ◽  
Plant Weight ◽  
Media Type ◽  
Pythium Root Rot ◽  
Rapid Sand Filtration

Pythium species incite crown and root rot and can be highly destructive to floriculture crops in greenhouses, especially when irrigation water is recycled. This study assessed the performance of rapid filtration of recycled irrigation water for controlling pythium root rot of poinsettia (Euphorbia pulcherrima) in greenhouses. Two greenhouse experiments investigated the effect of filter media type (sand and activated carbon), fungicide application (etridiazole), and pathogen inoculum source (infested growing media and infested irrigation water). Rapid sand filtration consistently controlled pythium root rot of poinsettia. Significant improvements in height, weight, root rot severity, and horticultural quality were observed for the plants in the sand filter treatment, compared with the inoculated control plants. However, the activated carbon filter removed essential nutrients from the irrigation water, resulting in plant nutrient deficiency and consequently leaf chlorosis, thus reducing plant weight, height, and horticultural quality. The etridiazole application did not completely prevent root infection by Pythium aphanidermatum, but plant weight, height, and horticultural quality were not negatively affected. P. aphanidermatum spread from infested growing media to healthy plants when irrigation water was recycled without filtration. Rapid sand filtration appears to have the potential to limit the spread of P. aphanidermatum that causes root rot of greenhouse floriculture crops.

Growing media, greenhouse tomato yield and Pythium root rot

2006 ◽  
Vol 86 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Viviane Juneau, Jean Caron ◽  
Carole Martinez, Valérie Gravel ◽  
Suzanne Allaire
Keyword(s):  
Root Rot ◽  
Chemical Properties ◽  
Anaerobic Conditions ◽  
Growing Media ◽  
Greenhouse Tomato ◽  
Tomato Yield ◽  
Cultural Conditions ◽  
Pythium Root Rot ◽  
Physico Chemical ◽  
Fall Experiment

Increased environmental pressure is forcing the horticultural industry to look for new growing media in replacement of rockwool and high-quality peat substrates. The objectives of this study were to determine: (1) the effect of different substrates on greenhouse tomato (Lycopersicon esculentum Mill.) yield and root rot caused by Pythium, and (2) thethreshold values of some substrate physico-chemical properties for tomato yield and Pythium root rot. Two experiments (fall, spring) were conducted using five substrates. In the fall experiment, yield was related to water availability, as long as aeration was sufficient. In the spring experiment, yield depended on air storage and gas concentrations (O2, CO2) in the substrate because of their low aeration levels. The effect of substrate types and their physico-chemical properties on Pythium root rot varied according to the cultural conditions. Under fall cropping conditions, substrates showing wet and anaerobic conditions favoured Pythium root rot. In these experiments, adequate aeration properties for tomato plant productivity were obtained with a maximum of 30% low-quality peat added to a mixture of sawdust and compost. Key words: Growing media, irrigation strategies, physico-chemical properties, Pythium root rot, Lycopersicum esculentum

Treatment Methods for the Removal of Off-Flavours from Heavily Polluted River Water in the Netherlands – A Review

1983 ◽  
Vol 15 (6-7) ◽  
pp. 301-310 ◽  
Author(s):  
J Hrubec ◽  
H A M de Kruijf
Keyword(s):  
Activated Carbon ◽  
The Netherlands ◽  
River Water ◽  
River Rhine ◽  
Sand Filtration ◽  
Treatment Methods ◽  
Polluted River ◽  
The North ◽  
Carbon Filtration ◽  
Rapid Sand Filtration

In The Netherlands the raw water, obtained from the heavily polluted river Rhine, has off-flavours which must be removed by using sophisticated and expensive treatment methods to be acceptable for drinking. One method consists of storage of river water in open bankside reservoirs with residence time of a few months followed by physical-chemical treatment involving coagulation, ozonation, rapid sand filtration, activated carbon filtration and disinfection. Another method used consists of pretreatment of river water by means of coagulation and rapid sand filtration followed by underground storage in the dune areas along the North Sea coast by means of artificial recharge. The water after the recharge is treated by using aeration, dosing of powdered activated carbon, rapid sand filtration and slow sand filtration. The most effective treatment processes for improvement of taste and odour are ozonation and activated carbon filtration.

Removal of Nematodes by Rapid Sand Filtration

1969 ◽  
Vol 95 (1) ◽  
pp. 1-16
Author(s):  
Irvine Wen-Tung Wei ◽  
R. S. Engelbrecht ◽  
John H. Austin
Keyword(s):  
Sand Filtration ◽  
Rapid Sand Filtration

Iron and manganese removal by a membrane filtration system

2001 ◽  
Vol 1 (5-6) ◽  
pp. 357-364 ◽  
Author(s):  
Y. Jimbo ◽  
K. Goto
Keyword(s):  
Membrane Filtration ◽  
Manganese Concentration ◽  
Sand Filtration ◽  
Design Standards ◽  
Manganese Removal ◽  
Filtration System ◽  
Small Capacity ◽  
Rapid Sand Filtration ◽  
Removal System ◽  
Iron And Manganese

The design standards of the iron and manganese removal system by membrane filtration were investigated. The membrane filtration after pre-chlorination could remove iron completely and could remove around 70% of manganese. In the case of manganese concentration being more than 0.05 mg/l, the membrane filtration could remove them completely after the deposition in the oxidation tank. The concentrations of iron and manganese were reduced more than 90% by the oxidation tank and were reduced until under the detection limit after the membrane filtration. The economic comparisons between the rapid sand filtration system and this membrane filtration system in a small capacity and a middle capacity were investigated. The 15 years total costs of the membrane filtration system were estimated to be smaller than or around equal to the rapid sand filtration system in both capacities.

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