Growth and source-sink relationship in carrot plants biostimulated with Quitomax® and Pectimorf®
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Abstract
The research was developed with the aim of evaluating the influence of chitosan oligosaccharins and oligogalacturonides on the growth and source-sink relationship of the carrot crop. A randomized block experimental design with three replicates was established to evaluate the foliar application of 150 mg ha-1 of QuitoMax® and Pectimorf® on plants at 20 and 50 days after planting (DAS). Periodic destructive sampling was carried out to determine, among other agromorphological variables: height, leaf area, accumulation and distribution of dry mass in the plant, from which growth rates and source-sink potentials were calculated throughout the biological cycle. At harvest, crop length, diameter, fleshy root weight and yield were evaluated. A direct effect of both oligosaccharins on photosynthetic activity, production and distribution of photoassimilates from leaves to roots in early stages of the biological cycle was evidenced. The results validated the favorable effect of the biostimulants on plant growth and dry mass production with a significant impact of the PectiMorf® product (oligogalacturonide mixture) on the commercial quality of the fleshy root and yield at harvest.
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