Irrigation Water 
11 
Ainaranthus retroflexus 49 
Iva xanthifolia 42 
Polygonum aviculare 22 
Chenopodium album 22 
Rumex crispus 6 
Helianthus annuus 2 
Ambrosia artemisaefolia 3 
Grindelia squarrosa 3 
Argemone intermedia 1 
Solanum rostratum 1 
Papaver species 1 
Polygonum persicaria 1 
Verbena bracteosa 2 
Leonurus cardiaca 3 
Mentha species 4 
TEST No. 118. DITCH No. 1. 
Date, May 5, 1916. Duration, 15 min. 
Species of weed seeds, 17. 
Number of seeds, 99. 
Taraxacum officinale 27 
Chenopodium album 24 
Amaranthus blitoides 4 
Amaranthus retrofiexus 7 
Amaranthus graecizans 1 
Iva xanthifolia 4 
Rumex crispus 8 
Polygonum aviculare 9 
Polygonum convolvulus 5 
Polygonum persicaria 1 
Cleome serrulata 1 
Solanum rostratum 1 
Ambrosia artemisaefolia 2 
Setaria viridis 2 
Lappula occidentale 1 
Verbena hastata 1 
Mentha species 1 
TEST No. 121. DITCH No. 1 
Date, May 19, 1919. Duration, 15 min. 
Species of weed seeds, 21. 
Number of seeds, 208. 
Taraxacum officinale 6 
Amaranthus blitoides 20 
Amaranthus retrofiexus 41 
Rumex crispus 12 
Chenopodium album 30 
Polygonum aviculare 25 
Polygonum convolvulus 7 
Polygonum persicaria 3 
Ambrosia artemisaefolia 4 
Iva xanthifolia 23. 
Carex species 3 
Echinochloa crus-galli 6 
Setaria viridis 3 
Papaver species 8 
Cleome serrulata 1 
Grindelia squarrosa 1 
Mentha species 4 
Verbena bracteosa 8 
Helianthus annuus 1 
Leonurus cardiaca 1 
Panicularia grandis , I 
TEST No. 122. DITCH No. 1. 
Date, May 20, 1919. Duration, 15 min. 
Species of weed seeds, 18. 
Number of seeds, 189. 
Taraxacum officinale 6 
Rumex crispus 5 
Chenopodium album 30 
Amaranthus retroflexus 57 
Amaranthus blitoides 16 
Polygonum aviculare 25 
Iva xanthifolia 16 
Carex species 3 
Verbena bracteosa 9 
Polygonum convolvulus 4 
Papaver species 6 
Polygonum persicaria 3 
Echinochloa crus-galli 2 
Mentha species 3 
Argemone intermedia 1 
Syntherisma humifusum 1 
Solanum rostratum 1 
jrindelia squarrosa 1 
TEST No. 124. DITCH No. 1. 
Date, May 20, 1919. Duration, 15 min. 
Species of weed seeds, 20. 
Number of seeds, 191. 
Taraxacum officinale 34 
Amaranthus blitoides 20 
Amaranthus retroflexus 28 
Chenopodium album 41 
Iva xanthifolia 12 
Polygonum aviculare 16 
Polygonum convolvulus 3 
Polygonum persicaria 3 
Rumex crispus 5 
Carex species 4 
Grindelia squarrosa 5 
Papaver species 7 
Ambrosia artemisaefolia 2 
Verbena bracteosa 4 
Solanum rostratum 1 
Echinochloa crus-galli 1 
Setaria viridis 1 
Leonurus cardiaca 1 
Mentha species 2 
Helianthus annuus 1 
TEST No. 126. DITCH No. 1. 
Date, May 20, 1919. Duration, 1.5 min. 
Species of weed seeds, 20. 
Number of seeds, 192. 
Taraxacum officinale 18 
Chenopodium album 28 
Amaranthus blitoides 22 
Amaranthus retroflexus 39 
Iva xanthifolia 32 
Polygonum aviculare 16 
Rumex crispus 8 
Polygonum convolvulus 3 
Polygonum persicaria 5 
Echinochloa crus-galli 3 
Grindelia squarrosa 2 
