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Agriscientia

On-line version ISSN 1668-298X

Abstract

FACCINI, D.  and  VITTA, J.. Effect of seed burial, different residue levels and thermal enviroment on germination and emergence of Amaranthus quitensis K. Agriscientia [online]. 2007, vol.24, n.1, pp.19-27. ISSN 1668-298X.

Germination and emergence are the most important stages in the invasion process of annual weeds. The objective was to relate germination and emergence of Amaranthus quitensis with seed sowing depth, crop residue and different thermal environment of seeds in the soil. During 2000 y 2001 seeds were buried in bags at two depths (0.5 and 4 cm), with two residue levels (0 and 6.000 kg/ha). In situ germination was periodically recorded. Emergence was evaluated in pots with the same seed sowing depths and residue levels treatments. In all cases, the soil daily thermal amplitude was recorded. Germination and emergence were linearly related with the thermal amplitude and were highest at 0.5 cm and without residue. At 4 cm and with residue the delay in the emergence and the rate of increment of the emergence were higher relative to all other treatments. Daily thermal amplitude was affected both by crop residue levels and seed sowing depth. These changes in seed environment determined the complete loss of dormancy so that germination and emergence were lower when seeds were buried or with high residue levels.

Keywords : Thermal amplitude; In situ germination; Amaranthus quitensis.

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