Abstract
Sanitary landfill leachate is one of the major problems arising from disposal of urban waste. Sanitary landfill leachate may, however, have use in agriculture. This study, therefore, aimed to analyze initial plant growth and gas exchange in sunflower seedlings supplemented with sanitary landfill leachate and subjected to drought stress through variables of root fresh mass (RFM), shoot fresh mass (SFM), total fresh mass (TFM), relative chlorophyll content (CL), stomatal conductance (g s ), transpiration rate (E), net photosynthetic rate (A), ratio of internal to external CO2 concentration (Ci/Ca),water use efficiency (EUA), instantaneous carboxylation efficiency (A/Ci), and electron transport rate (ETR). The experimental design was a completely randomized 2 (irrigated and non-irrigated)×4 (sand, sand + 100kg Nha-1 organic fertilizer, sand + 100kg Nha-1 sanitary landfill leachate, and sand + 150kg Nha-1 sanitary landfill leachate) factorial with five replicates. Under drought stress conditions, leachate treatment supplemented with 100kg Nha-1 exhibited higher plant fresh weights than those of the treatment containing 150kg Nha-1. Increases in fresh mass in plant treatments supplemented with 100 and 150kgN ha-1 sanitary landfill leachate were related to higher photosynthetic rates.
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