8 
Coi.ORADo Experiment Station 
TIOST No. ,TS, DITCH No. 2 
Djito, June 21, 1J)1S. Duration, 240 min. 
Species of weed seeds, 15. 
Number of seeds, 331, 
Amaranthus blitoides 26 
Amaranthus retroflexus 57 
Ambrosia artemisaefolia 1 
Carex species 110 
Chenopodium album 85 
Echinochloa crus-galli 1 
Iva xanthifolia 7 
Polygonum aviculare 12 
Polygonum convolvulus 2 
Polygonum persicaria 1 
Portulaca oleracea 15 
Ranunculus species 1 
Taraxacum officinale 3 
Verbena hastata 4 
Grindelia squarrosa 6 
TEST No. 40. DITCH No. 2. 
Date, June 18, 1918. Duration, 300 min. 
Species of weed seeds, 16. 
Number of seeds, 266. 
Amaranthus blitoides 31 
Amaranthus retroflexus 31 
Carex species 90 
Chenopodium album . . .'^ 67 
Grindelia squarrosa 3 
Iva xanthifolia 5 
Nepeta cataria 2 
Polygonum aviculare 12 
Polygonum convolvulus 1 
Polygonum persicaria 1 
Portulaca oleracea 10 
Rumex crispus 1 
Taraxacum officinale 2 
Verbena hastata 8 
Polygonum engelmanii 1 
Capsella bursa-pastoris 1 
TEST No. 41. DITCH No. 2. 
Date, June 21, 1918. Duration, 300 min. 
Species of weed seeds, 16. 
Number of seeds, 863. 
Amaranthus blitoides 85 
Amaranthus retroflexus 158 
Carex species i 365 
Chenopodium album 170 
Ambrosia trifida 1 
Cleome serrulata 1 
Grindelia squarrosa 1 
Iva xanthifolia 39 
Polygonum aviculare 30 
Polygonum convolvulus 9 
Polygonum persicaria 4 
Rumex crispus 7 
Taraxacum officinale 8 
Verbena hastata 3 
Capsella bursa-pastoris 3 
Avena sativa 6 
TEST No. 42. DITCH No. 2. 
Date, June 19, 1918. Duration, 420 min. 
Species of weed seeds, 24. 
Number of seeds, 1,364. 
Amaranthus blitoides 69 
Amaranthus retroflexus 238 
Carex species 655 
Chenopodium album ..230 
Cleome serrulata . . ! 1 
Geranium species 5 
Grindelia squarrosa 9 
Helianthus annuus • 2 
Iva xanthifolia 23 
Oxalis stricta 1 
Polygonum aviculare 27 
Polygonum convolvulus 10 
Polygonum persicaria 8 
Portulaca oleracea 23 
Rumex acetosella 1 
Rumex crispus 16 
Salvia species 3 
Solanum rostratum 3 
Taraxacum officinale 22 
Verbena hastata 3 
Capsella bursa-pastoris 1 
Medicago lupulina 1 
Veronica species 1 
Avena sativa 12 
TEST No. 43. DITCH No. 1. 
Date, June 19, 1918. Duration, 420 min. 
Species of weed seeds, 20. 
Number of seeds, 763. 
Amaranthus blitoides 28 
Amaranthus retroflexus 22 
Carex species 542 
Chenopodium album 73 
Ambroisa trifida 1 
Geranium species 1 
Grindelia squarrosa 2 
Helianthus annuus 1 
Iva xanthifolia 23 
Polygonum aviculare 30 
Polygonum convolvulus 9 
Polygonum persicaria 2 
Ranunculus species 1 
Rumex crispus 9 
Setaria viridis 3 
Solanum rostratum 1 
Taraxacum officinale 8 
Teucrium occidentale 1 
Urtica gracilis 1 
Avena sativa 1 
TEST No. 47. DITCH No. 2 
Date, June 20, 1918. Duration, 240 min. 
Species of weed seeds, 13. 
Number of seeds. 299. 
Amaranthus blitoides 21 
Amaranthus retroflexus 21 
Carex species 174 
