Substrate and seed sowing position on the production of Plukenetia volubilis L. seedlings/Substrato e posicao de semeadura na producao de mudas de Plukenetia volubilis L

• Published in: Revista brasileira de engenharia agrícola e ambiental 2018-06, Vol.22 (6), p.396
• Main Authors: Jeromini, Tatiane S, Barbosa, Ana S.V, da Silva, Givanildo Z, Ma
• Format: Article
• Language: English
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v22n6p396-400

Plukenetia volubilis is a species native to the Amazonia and has economic potential due to the high contents of polyunsaturated fatty acids and vitamins of the seeds; however, information about production of seedlings in nursery is scarce. Factors that contribute to fast emergence and generation of vigorous seedlings are desirable for plant production in the nursery. Therefore, this study aimed to identify the most favorable substrate and seed position for the production of P. volubilis seedlings. The seeds were sown in the following four positions: hilum facing up, hilum facing down, seed lying on its cotyledon suture, and seed lying flat on one of its cotyledon faces. The substrates were sand, vermiculite and commercial substrate. Treatments were distributed according to a completely randomized design in a 4 x 3 factorial arrangement (seed position and substrate) with three replicates of 25 seeds each. The following variables were evaluated: emergence percentage; first count of seedlings; number, width and length of leaves; plant height; stem diameter; dry matter of shoots and roots. It was concluded that the production of P volubilis seedlings is not affected by either substrate or seed position at sowing. The substrates most favorable to the quality of P. volubilis seedlings were the commercial substrate and vermiculite, always for the positions of seed lying on its cotyledon suture, with faces parallel to tube walls, and seed lying flat on one of its faces. Key words: emergence Sacha inchi seedlings vigor Plukenetia volubilis e uma especie nativa da Amazonia e apresenta potencial economico devido aos elevados teores de acidos graxos poli-insaturados e vitaminas das sementes, mas, as informacoes para a producao de mudas em viveiros sao escassas. Fatores que contribuam para rapida emergencia das plantulas e a formacao de mudas vigorosas sao desejaveis na producao de plantas em viveiros. Assim, objetivou-se identificar o substrato e a posicao de semeadura mais favoraveis a producao e a qualidade de mudas de P volubilis. As sementes foram colocadas para germinar em quatro posicoes: com o hilo voltado para cima, com o hilo voltado para baixo, semente de lado sobre a espessura e de lado sobre uma das faces. Os substratos utilizados foram: areia, vermiculita e substrato comercial. O delineamento utilizado foi inteiramente casualizado em arranjo fatorial 4 x 3 (posicoes da semente x substratos) com quatro repeticoes de 25 sementes. Foram avaliados: a porcenta