Chemical and physical characterization of substrates in the production of lettuce plantlets
Abstract
Knowing the substrates used in the production of plantlets is important because they must provide ideal physical and chemical characteristics for growth in propagation. It was conducted chemical and physical characterization and evaluation of the effect of substrate Horta 2® and its combination with carbonized rice hull in the development of plantlets of two lettuce cultivars (Lactuca sativa L.). The experiment was conducted in a greenhouse. Treatments consisted of a factorial combination of commercial substrate Horta 2® and this substrate mixed with carbonized rice hull (1:1, 3:1 v/v) and two lettuce cultivars ‘Pira 72 Belíssima’ and ‘Pira 63 Roxa’. The experiment was arranged in a randomized complete block design with three replicates. Physical and chemical properties of the substrates and at 14, 21, 28 and 35 days after sowing the plantlet biological responses through phytometric parameters were evaluated. The use of carbonized rice hull with Horta 2® substrate prioritizes the physico-chemical characteristics of these, which is advantageous for the development of lettuce plantlets.
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