Germination, emergence and implantation of tall wheatgrass experimental varieties

Borrajo, C.I.; Alonso, S.I.

Revista Argentina de Produccion Animal 24(1/2): 29-40

2004


Accession: 004177312

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Abstract
Tall wheatgrass (Thinopyrum ponticum [Elymus elongatus]) is a forage grass used in soils with limitations due to alkalinity, salinity, low drainage and poor nutritional levels. A successful implantation of this grass depend not only on seed quality but also on its germination capacity in soils with limitations. The objective of this work was to evaluate germination capacity, seedling emergence and implantation of synthetic cultivars of tall wheatgrass in different environments. Three trials were made at Balcarce, Argentina, with 6 synthetic cultivars (SA, SC, SJ, SM, SP, SV) and a control (cv. EL Vizcachero INTA). The experiments were given different stress levels: (1) without stress (incubation under optimum conditions of germination, in a chamber); (2) intermediate stress (sowing in a glasshouse, in pots with alkaline soil (Natracuol)); (3) maximum stress (conventional sowing on a Natracuol soil). Germination percentage and rate, seedling emergence and mortality, initial tillering, density, tiller weight, phenologic index and initial dry matter production were registered. Significant differences were detected between the control and synthetic cultivars. Three of the synthetic cultivars exhibited promising behaviour to be used under alkaline soil and flooded conditions. The germination behaviour of the cultivars under optimum conditions and its effect on the emergence and implantation under uncontrolled environments are also discussed.