Seed testing in Iowa. 



271 



Weight Table for Weed Seeds. 

 To determine number of any kind of seed to the ounce, multiply 

 number per gram, as given in table, by 28 • 3, to find number to the 

 pound, multiply as before, the number per gram by 453 "öS. 



Name of seed 



Number 

 of seeds 

 per gram 



Weight of 

 one seed in 

 Milligrams 



Ahutilon avicennae (Velvet Leaf) . 

 Acnida tiiberculata (Water Hemp) 

 Ägropyrum repens (Quack Grass) . 

 Amarantus retroflexus (Tumbleweed) 

 Aynhrosia artemisiaefolia (Small ragweed) 



Anthemis cotula (Mayweed) 



Arcfium lappa (Burdock) 



Avena fatua (Wild Oats) 



., sativa (Oats) 



Brassica nigra (Black Mustard) . . . 



„ arvensis (Wild Mustard) . . . 

 Bromus arvensis (Brome Grass) 

 Camelina sativa (False Flax) .... 

 Cassia chamaecrista (Partridge Pea) . 

 Chenopodium alhum (Lamb's-quarter) 

 Cichorium intyhus (Chicory) .... 

 Cirsium arvense (Canada Thistle) . 



„ discolor (Common Thistle) . . 



;, lanceolatum (Bull Thistle) 



Chilean Dodder 



Cuscuta arvensis (Dodder) 



„ epithymum (Clover Dodder) . 

 Cyperus esculentus (Nut Grass) . . . 



Dalea alopecuroides (Dalea) 



Dactijlis glomerata (Orchard Grass) . . 

 Datura stratnonium (Jimson Weed) . 

 Daucus carota (Wild Carrot)] .... 

 Elymus virginicus (Wild Rye) .... 



Euphorbia Freslii (Spurge) 



Hihiscus trionum (Mallow) 



Ipomoea purpurea (Morning-glory) 



15 

 357 



'77 



37 

 •4 



238 



12 

 •22 



1 



'782 

 •02 



89 



11 

 •4 



69 



154 



13 



79 



19 



8 



592 



26 



85 



855 



73 



25 



8 

 '27 



581 



28 

 •4 



