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Investigación Agraria

On-line version ISSN 2305-0683


KUBOTA, Victoria Rika; ENCISO GOMEZ, Manuel Marino  and  VERA DE ORTIZ, Mirtha. Influence of pot size and substratum composition on quality of Pongamia pinnata (L.) Pierre. Investig. Agrar. [online]. 2015, vol.17, n.1, pp.65-71. ISSN 2305-0683.

The main aim of this research was to assess plastic plant pot size and substrate composition influence on the quality of Pongamia pinnata (L) Pierre plants and, additionally, to determine phytosanitary problems and malformations present on them. A 3 x 3 factorial design was applied, having as factors substratum composition (S1, soil derived from basalt; S2, soil derived from sandstone and S3, hydromorphic soil) and size of plastic plant pot (M1, 5 x 12 cm; M2, 7 x 15 cm and M3, 20 x 25 cm). Treatments were completely randomly distributed. The morphological parameters evaluated were slenderness index, root shoot dry weight ratio and Dickson quality index. Determination of phytosanitary problems and possible malformations were carried out regularly, regardless of treatment type, limited to registration and description. Results show that the highest quality plants were those on treatments with 7x15 cm plastic plant pots, due to a better shoot dry weight/root dry weight ratio. Although plants on treatment with 20x25 cm plastic plant pot yielded the highest Dickson quality index, they presented less balance between the aerial and the root system, as did plants produced on treatment with 5 x 12 cm plant pots. Substrate composition influence was not verified. Furthermore, possible albinism and   malformation in some seedlings were observed, in addition to Liriomyza sp. larvaeattacks.

Keywords : Pongamia pinnata; seedling quality; morphological parameters; phytosanitary problems; malformations.

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