Torta de filtro na produção de mudas de arroz

Abstract

Considering the economic importance of rice cultivation and the use of substrates that enable efficient seedling production, as transplanting is one of the most widely used cultivation methods in rice production systems, the objective of this study was to evaluate the effect of filter cake for substrate composition on the emergence and initial growth of rice seedlings. The experiments were conducted in the field and in the Phytotechnics Laboratory of the Campus of Engineering and Agricultural Sciences (CECA) at the Federal University of Alagoas (UFAL), both located in Rio Largo, AL, Brazil. The experimental design used was randomized complete blocks (RCB), with a total of seven substrates and four replicates for each substrate, with each replicate composed of 50 seeds. Sowing was carried out in plastic trays containing substrates composed of: S1: Washed sand, soil, and filter cake (1:1:1); S2: Washed sand; S3: Soil; S4: Washed sand and soil (1:1); S5: Washed sand and filter cake (1:1); S6: Soil and filter cake (1:1); S7: Filter cake. These initial results indicated the beneficial effects of using filter cake in rice seedling production, which can be employed either in combination with washed sand or soil, or even separately. It was observed that rice seedlings obtained in substrates S1, S5, S6, and S7 did not significantly differ in terms of shoot length. For seedling production in trays and subsequent transplanting into the field, it would be interesting to use this organic substrate alone or combined with soil (1:1), considering that in addition to greater dry weight, they showed a higher percentage and speed of emergence. Keywords: Oryza sativa L. Organic substrate. Seedling transplantation.