10 
Colorado Exi^eriment Station 
TKST No. 77. DIT( H No. 1. 
Date, Aii^'. 1, J918. Duration, 1,440 iniu. 
Species of weed seeds, 3. 
Number of seeds, 3. 
Amaranthus blitoides 1 
Carex species 1 
Rumex crispus 1 
TEST No. 79. DITCH No. 1. 
Date, July 22, 1918. Duration, 3«9 min. 
Species of weed seeds, 2. 
Number of seeds, 2. 
Rumex crispus 1 
Secale cereaie 1 
TEST No. 81. DITCH No. 1. 
Date, Aug. 1, 1918. Duration, 1,440 min. 
Species of weed seeds, 3. 
Number of seeds, 4. 
Amaranthus blitoides 2 
Tiumex crispus 1 
Agropyron tenerum 1 
TEST No. 86. DITCH No. 1. 
Date, July 25, 1918. Duration, 690 min. 
Species of weed seeds, 3. 
Number of seeds, 4. 
Amaranthus retroflexus 1 
Chenopodium album 2 
Polygonum aviculare 1 
TEST No. 90. DITCH No. I. 
Date, July 23, 1918. Duration, 1,080 min. 
Species of weed seeds, 2. 
Number of seeds, 2. 
Amaranthus blitoides 1 
Rumex crispus 1 
TEST No. 91. DITCH No. 1. 
Date, July 25, 1918. Duration, 600 min. 
Species of weed seeds, 2. 
Number of seeds, 2. 
Polygonum convolvulus 1 
Rumex crispus 1 
TEST No. 96. DITCH No. 1. 
Date, Aug. 22, 1918. Duration, 4,.320 min. 
Species of weed seeds, 3. 
Number of seeds, 4. 
Ranunculus species 1 
Amaranthus blitoides 2 
Polygonum aviculare 1 
TEST No. 100. DITCH No. 1. 
Date, Aug. 10, 1918. Duration, 2,880 min. 
Species of weed seeds, 3. 
Number of seeds, 13. 
Amaranthus blitoides 4 
Rumex crispus C 
Polygonum aviculare 7 
TEST No. 101. DITCH No. 1. 
Date, Aug. 3, 1918. Duration, 1,440 min. 
Species of weed seeds, 7. 
Number of seeds, 48. 
Amaranthus blitoides 16 
Amaranthus retroflexus 6 
Chenopodium album 7 
Polygonum aviculare 8 
■ Rumex crispus 8 
Solanum rostratum 1 
Ranunculus species 2 
TEST No. 106. DITCH No. 1. 
Date, Aug. 10, 1918. Duration, 720 min. 
Species of weed seeds, 7. 
Number of seeds, 30. 
Carex species 1 
Chenopodium album 4 
Polygonum aviculare 7 
Amaranthus blitoides 8 
Polygonum convolvulus 1 
Rumex crispus 10 
Polygonum engelmanii 1 
TEST No. 107. DITCH No. 1. 
Date, Aug. 14, 1918. Duratiou, 1,440 min. 
Species of weed seeds, 7. 
Number of seeds, 23. 
Amaranthus blitoides 4 
Amaranthus retroflexus 1 
Carex species 2 
Chenopodium album 2 
Polygonum aviculare 4 
Rumex species 9 
Geranium species 1 
TEST No. 110. DITCH No. 1. 
Date, June 5, 1919. Duration, 1.5 min. 
Species of weed seeds, 15. 
Number of seeds, 191. 
Taraxacum offlcinale 20 
Chenopodium album 23 
Carex species 27 
Amaranthus blitoides 27 
Amaranthus retroflexus 38 
Iva xanthifolia 15 
Polygonum aviculare 22 
Papaver species 3 
Grindelia squarrosa 3 
Rumex crispus 3 
Verbena stricta 1 
^Leonurus cardiaca 1 
Polygonum convolvulus 1 
Cleome serrulata 1 
Solanum rostratum 1 
TEST No. 114. DITCH No. 1. 
Date, .lime 5, 1919. Duration, 1.5 min. 
Species of weed seeds, IS. 
Number of seeds, 310. 
Taraxacum offlcinale 30 
Carex species 77 
Amaranthus blitoides 51 
