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Magnified view of a row of phytoliths within the leaf epidermis of crabgrass (Digitaria sanguinalis). The dumb-bell shaped phytoliths are 32 micrometers in length. Compare this with an average cuboidal grain of table salt in which each side is 300 micrometers long. More than 800 of these crabgrass phytoliths could fit into a box the size of a grain of table salt! Photo taken at 400x and 1000x.
Digitaria sanguinalis. Bermuda grass. D. dactylonthese, as well as P. divergens, ought to be cultivated: these in dry, that in wet soils. Silky Agrostis. A. seniceasand hillsmay be cultivated whereever there is calcareous matter in the soil., A. trichopodessand hills. A. junceasand hills, not fit for hay. Purple Aristida. A. spiciformis, do. Woolly do. A. lanosa, do. do. Fringed Andropogoii. A.
Weeds negatively impact crop growth and future yields. Literature suggests that sweet corn (Zea mays convar.saccharata var. rugosa) and some modern dent variants (field corn, Zea mays indentata) have varying degrees of weed tolerance (or weed suppressive ability).These variants were derived from teosinte, the ancestor to all corn varieties, which is a weedy plant that still grows wild in.
The settlers of New Zealand, so large a proportion of whom are engaged in rural occupations, which placing them in immediate contact with the works of nature, through observation and study ripening into confidential intercourse, will, doubtless, feel deeply indebted to Mr. Buller for his valuable essay on our Birds, which most interesting division of our Fauna exhibits a notable exception to.
Every essay is signed by the botanist, biologist, or other expert who wrote it; where essays have been revised or updated, the name of the updater appears as well. In the tradition of Magill reference, each essay is offered in a standard format that al-lows readers to predict the locationof core informa-tion and to skim for topics of interest: The title of each article lists the topic as it is.
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We also performed a replacement series experiment (mono and mixed) to evaluate the effects of elevated temperature on the competitiveness of A. philoxeroides with the native co-occurring species Digitaria sanguinalis. In the field survey, we found that the dominance of A. philoxeroides increased with increasing of latitude gradient while cover of D. sanguinalis decreased. In monospecific.