Abstract
The correct management of organic fertilization has been shown as an extremely viable alternative in the production of vegetables, providing high yields concomitant to the reduction of synthetic fertilizers. The improvement of the production can be interpreted by the physiological behavior, favored by the organic fertilization with the supply of nutrients. Thus, an experiment was carried out to evaluate the gas exchange and Soil-Plant Analyses Development (SPAD) chlorophyll content in tomato plants according to types of organic fertilizers and biofertilizer doses. The experimental design was completely randomized with treatments distributed in factorial arrangement (3 x 5), referring to organic fertilizer types (T1: earthworm humus; T2: goat manure and T3: cattle manure) and biofertilizer concentrations (600, 800, 1000, 1200 and 1400 ml), with four replications. The gas exchange and the SPAD chlorophyll content in tomato plants depend on the type of organic fertilizer and the concentration of biofertilizer. It was possible to observe that increasing doses of biofertilizer in the substrate with low organic concentration increase the gas exchange in tomato plants, while high doses together with more concentrated organic fertilizers reduce these characteristics. Key words: Alternative fertilizer, Lycopersicon esculentum, photosynthesis, organic fertilizer.  
Highlights
The tomato (Lycopersicon esculentum Mill.) is a plant of great economic importance, and is acknowledged to be among the most consumed vegetables, due to the high nutritional value of its fruits, rich in antioxidants (Filgueira, 2008)
An experiment was carried out to evaluate the gas exchange and Soil-Plant Analyses Development (SPAD) chlorophyll content in tomato plants according to types of organic fertilizers and biofertilizer doses
The gas exchange and the SPAD chlorophyll content in tomato plants depend on the type of organic fertilizer and the concentration of biofertilizer
Summary
The tomato (Lycopersicon esculentum Mill.) is a plant of great economic importance, and is acknowledged to be among the most consumed vegetables, due to the high nutritional value of its fruits, rich in antioxidants (Filgueira, 2008). The fruit yield and quality are influenced by several factors, such as growth conditions, which include plant nutrition (Oliveira et al, 2014; França et al, 2017; Ersahin et al, 2017). Among the tomato cropping systems, organic fertilization needs to be highlighted because it improves the soil and the plants, resulting in production reductions, since the producer can replace the commercial substrate with inputs found on the site (Oliveira et al, 2013a). The tomato crop responds satisfactorily to organic fertilization, factors such as type and quantity of fertilizers are determinant in improving plant growth and adequate development (Mueller et al, 2013, França et al, 2017). The combined use of organic fertilizer and biofertilizer can be a good alternative for organic fertilization in tomato, because besides providing more quantity may promote more displacement of nutrients to the roots
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