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vol.25 número2EVOLUCIÓN DE LAS EXPORTACIONES DE ACEITUNAS DE CHILE ENTRE LOS AÑOS 1993-2005APORTES SEDIMENTARIOS DE LOS RÍOS LLUTA Y SAN JOSÉ EN LA ZONA COSTERA DE LA RADA DE ARICA, CHILE índice de autoresíndice de assuntospesquisa de artigos
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Idesia (Arica)

versão On-line ISSN 0718-3429

Resumo

LAYNEZ-GARSABALL, José A; MENDEZ-NATERA, Jesús Rafael  e  MAYZ-FIGUEROA, Juliana. INFLUENCE OF CORN (ZEA MAYS L.) SEED SIZE ON SEEDLING GROWTH UNDER SALINE CONDITIONS. Idesia [online]. 2007, vol.25, n.2, pp.23-35. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292007000200004.

Seedling growth was studied from three seed size of two corn cultivars sowed in sand and watered with three saline solutions created with sodium chloride to simulate osmotic potentials of saline soils previously studied. Sowing was carried out in aluminum trays using 10 kg of sand and 50 seeds, watered daily (250 ml/tray) with saline solution. A split-split-plot design was used with four replications, main plots were constituted for the osmotic potentials (0, -0.328 y -0.547 MPa), sub-plots were the two corn cultivars (Himeca 95 and Pioneer 361) and sub-sub-plots were two seed sizes (< 0.32 g; = 0.32 - 0.36 g = and > 0.36 g). The following evaluations were recorded at 16 day after sowing: seedling height, root length, root volume, dry and fresh weight of shoot and radicle, seedling height: root length ratio and dry shoot weight: dry root weight ratio. An analysis of variance and Duncan's multiple range test were carried out. The inference level was 5%. The decreased osmotic potential of the irrigation water decreased the general seedling growth of corn cultivars. During the first days of growing, Himeca 95's seedlings outyielded Pioneer ones, but at the end of the experiment this was reverted, id est, Pioneer seedlings were superior. Seedlings from biggest seeds produced larger radicles than smallest ones, although this was not true with decreased osmotic potential, suggesting that the use of big corn seeds could represent an advantage in non saline soils.

Palavras-chave : Corn; salinity in sand culture; seed size.

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