Weeds of the Farm and GardenOrange Judd Company, 1912 - 281 páginas |
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Página 12
... species that live from year to year , the size of the root becomes an index of the persistency and pestiferousness of the plant . " Then he comments upon the length of roots of a great many different weeds , stating that the common ...
... species that live from year to year , the size of the root becomes an index of the persistency and pestiferousness of the plant . " Then he comments upon the length of roots of a great many different weeds , stating that the common ...
Página 27
... species of weed seeds was compiled by D. C. Snyder and Charlotte M. King in the Botanical Labora- tory of the Iowa state college . To ascertain the number of seeds per pound in any given variety multiply the num- ber per gram by 453.584 ...
... species of weed seeds was compiled by D. C. Snyder and Charlotte M. King in the Botanical Labora- tory of the Iowa state college . To ascertain the number of seeds per pound in any given variety multiply the num- ber per gram by 453.584 ...
Página 36
... -4 , seeds of Kentucky blue grass , the scales cover the seed ; 5-8 , Canadian blue grass . Notice the dif- ference in shape . ( Hillman and King . ) the 550 species studied by him , the age of seeds varied 36 WEEDS OF THE FARM AND GARDEN.
... -4 , seeds of Kentucky blue grass , the scales cover the seed ; 5-8 , Canadian blue grass . Notice the dif- ference in shape . ( Hillman and King . ) the 550 species studied by him , the age of seeds varied 36 WEEDS OF THE FARM AND GARDEN.
Página 37
Louis Hermann Pammel. species studied by him , the age of seeds varied from 125 to 135 years , and that a few of the old seeds germinated , notably those belonging to the pulse , water lily , and mallow families . In this connection the ...
Louis Hermann Pammel. species studied by him , the age of seeds varied from 125 to 135 years , and that a few of the old seeds germinated , notably those belonging to the pulse , water lily , and mallow families . In this connection the ...
Página 38
... of weed seeds . It was found that the seeds of different species showed great differences in germination ; in general the results of 1902 and 1903 indicated that stratification in sand and 38 WEEDS OF THE FARM AND GARDEN.
... of weed seeds . It was found that the seeds of different species showed great differences in germination ; in general the results of 1902 and 1903 indicated that stratification in sand and 38 WEEDS OF THE FARM AND GARDEN.
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Términos y frases comunes
achenes alfalfa annual awned biennial blue grass bracts branched brome grass bull thistle C. M. King calyx Canada thistle carpels cent Cirsium clover seed clusters cocklebur common weed corn corolla crab grass crop cultivated curled dock dodder erect Europe five five-lobed four foxtail fruit germination glabrous glumes hairy herb horse nettle impurities inches long involucre Iowa lanceolate leaf leaves linear lobes marsh elder meadows milkweed Minnesota Missouri morning glory mustard native North numerous oats oblong ovary ovate ovules panicles pappus pastures pepper grass perennial petals petioled pigweed pinnately pistil Plantago plantain plants plowing poisonous Polygonum prickly pubescent purple quack grass racemes ragweed roadsides roots rootstocks Rumex sepals sessile sheaths sheep sorrel slender smartweed smooth soil species spikelets spikes spreading Spurge squirrel-tail stamens stem stipules sulphate Sunflower sweet clover Texas three feet high toothed troublesome weed U. S. Dept upper waste places weed seeds wild yellow