Irrigation Water 
7 
'I'KST No. IS. DITCH No. 2. 
Date, June 6, lOlS. Diirntlon, 200 min. 
Species of weed seeds, 13. 
Number of seeds, 173. 
Amaranthus blitoides 17 
Carex species 9 
Chenopodium album 21 
Iva xanthifolia . 7 
Polyg-onum aviculare 10 
Polygonum convolvulus 1 
Polygonum persicaria 3 
Rumex crispus 4 
Ambrosia trifida 2 
Taraxacum officinale 96 
Echinochloa crus-galli 1 
Nepeta cataria 1 
Grindelia squarrosa 1 
TEST No. 20. DITCH No. 2. 
Date, June 7, 1918. Duration, 300 min. 
Species of weed seeds, 12, 
Number of seeds, 229. 
Amaranthus blitoides 35 
Amaranthus retrofiexus 27 
Carex species 46 
Chenopodium album 56 
Iva xanthifolia 8 
Polygonum aviculare 20 
Polygonum convolvulus 4 
Rumex crispus 14 
Taraxacum officinale 16 
Grindelia squarrosa 1 
Ranunculus species 1 
Cleome serrulata 1 
TEST No. 25. DITCH No. 2. 
Date, June 8, 1918. Duration, 720 min. 
Species of weed seeds, 11. 
Number of seeds, 257. 
Amaranthus blitoides 18 
Amaranthus retrofiexus 16 
Carex species 28 
Chenopodium album 33 
Iva xanthifolia 1 
Polygonum aviculare 15 
Polygonum convolvulus 2 
Polygonum persicaria 3 
Rumex crispus 3 
Taraxacum officinale 137 
Argemone intermedia 1 
TEST No. 29. DITCH No. 1. 
Date, June 11, 1918. Duration, 360 min. 
Species of weed seeds, 10. 
Number of seeds, 199. 
Amaranthus blitoides 7 
Amaranthus retrofiexus 17 
Carex species 85 
Chenopodium album 30 
Iva xanthifolia 6 
Polygonum aviculare 10 
Polygonum persicaria 2 
Taraxacum officinale 40 
Verbena hastata 1 
Panicum capillare 1 
TEST No. 30. DITCH No. 2. 
Date, June 11, 1918. Duration, 360 min. 
Species of weed seeds, 5. 
Number of seeds, 16. 
Amaranthus retrofiexus 2 
Carex species 5 
Chenopodium album 7 
Rumex crispus 1 ' 
Taraxacum officinale 1 
TEST No. 32. DITCH No. 2. 
Date, June 11, 1918. Duration, 360 min. 
Species of weed seeds, 18. 
Number of seeds, 633. 
Amaranthus blitoides 29 
Amaranthus retrofiexus 50 
Carex species 208 
Chenopodium album 235 
Iva xanthifolia 15 
Polygonum aviculare 21 
Polygonum convolvulus 3 
Polygonum persicaria 4 
Rumex crispus 11 
Taraxacum officinale 33 
Grindelia squarrosa 4 
Cleome serrulata 2 
Ambrosia artemisaefolia 1 
Panicum capillare 2 
Nepeta cataria 4 
Geranium species 4 
Portulaca oleracea 7 
Glyceria species 2 
TEST No. ,34. DITCH No. 2. 
Date, June 12, 1918. Duration, 360 min. 
Species of weed seeds, 14. 
Number of seeds, 185. 
Amaranthus blitoides 23 
Amaranthus retrofiexus 55 
Carex species 2 
Chenopodium album 67 
Iva xanthifolia 6 
Polygonum aviculare 11 
Polygonum convolvulus 5 
Polygonum persicaria 1 
Rumex crispus 6 
Taraxacum officinale 4 
Nepeta cataria 1 
Oxalis stricta 1 
Syntherisma humifusum 2 
Lupinus species 1 
