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Title: Deployment of Sawdust as Substrate Medium in Hydroponically Grown Lettuce
Authors: Christoulaki, Marirena 
Gouma, Sofia 
Manios, Thrassyvoulos 
Tzortzakis, Nikos G. 
Keywords: Lactuca sativa;Sawdust;NFT;Organic materials;Perlite;Plant growth;Soilless culture;Lettuce;Yield
Category: Other Agricultural Sciences
Field: Agricultural Sciences
Issue Date: May-2014
Source: Journal of Plant Nutrition, 2014, vol. 37, no. 8, pp. 1304-1315
Journal: Journal of Plant Nutrition 
Abstract: In this study, lettuce plants were grown in sawdust (Saw) and/or perlite (Per) mixtures (sawdust; Saw:Per 75:25%; Saw:Per 50:50%; Saw:Per 25:75%; Perlite) and in Nutrient Film Technique (NFT), in an unheated greenhouse. Plants grown in NFT were taller with greater leaf area resulting in greater fresh weight. Sawdust addition reduced leaf length, leaf area and as a consequence the fresh weight but not the leaf number. However, leaf dry weight increased as sawdust content increased into the substrate. Leaf chlorophyll reduced but leaf fluoresces increased in perlite and NFT. High sawdust content (75% or 100%) reduced photosynthetic rates and stomatal conductance. Nutrient uptake [potassium (K), sodium (Na), phosphorus (P)] was the greatest in NFT treatment, while perlite and Saw:Per 25:75% increased elemental uptake (up to 74%) comparing with the remaining treatments. Leaf elemental analysis fluctuated among treatments. Thus, low content (i.e. 25%) of sawdust in perlite could improve inorganic substrate media properties.
ISSN: 0190-4167
DOI: 10.1080/01904167.2014.881870
Collaboration : Cyprus University of Technology
Technological Educational Institute (TEI) of Crete
Rights: © Taylor & Francis
Type: Article
Appears in Collections:Άρθρα/Articles

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