In a rotational sequence, when an allelopathic plant is left as a residue or mulch, especially in minimum-tillage
systems could control subsequent weeds growth. To study effect of saffron residues on redroot pigweed
(Amaranthus retroflexus L.) and small bind weed (Convolvulus arvensis L.) control an experiment was
conducted under laboratory and green house conditions in a CRD with factorial arrangement at three
replications. Studied treatments were leaves, corms and leaves+corms extracts in different concentrations (0,
1%, 2%, 3% and 4%). Statistical analysis of the results was carried out by MSTATC software and LSD was used
for comparison of means. Extract of corm, leaves and corm plus leaves caused 24%, 24% and 53% reduction in
final germination percentage of both weeds, respectively, compared to an un-primed check. These reduction
values of seed germination have been probably arisen from effect of saffron allochemicals on enzymes activities
responsible for germination. Redroot pigweed rate of germination affected more than small bindweed by
concentration of saffron extract. At the higher extract concentration (4%), germination rate in redroot pigweed
decreased up to 77%, but only 51% in small bindweed. Saffron extract could intensively decrease seedling dry
weight of redroot pigweed (39%) rather than small bindweed. Seedling dry weight in Convolvulus was greater
than Amaranthus, especially when the seeds were treated with saffron corm plus leaves extract. The farmers that
rotate summer crops after saffron could incorporate saffron residues in the soil, and this can be use in
controlling of some dominant weeds as an effective way in integrated weed management strategies.