The Book of Wheat: An Economic History and Practical Manual of the Wheat IndustryO. Judd, 1908 - 369 páginas |
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Página 163
... spores . ( 1 ) Aecidiospores ( injuring spores ) are the first spores found in the year . They occur on shrubs , or herbs other than grasses . ( 2 ) Uredospores ( blight spores ) appear in the early summer , and are often called summer ...
... spores . ( 1 ) Aecidiospores ( injuring spores ) are the first spores found in the year . They occur on shrubs , or herbs other than grasses . ( 2 ) Uredospores ( blight spores ) appear in the early summer , and are often called summer ...
Página 164
... spores that are formed , and these red summer spores , the uredospores , are thus enabled to drop off and float away upon the air to other wheat plants . If moisture is present they germinate at once , and the en- tire above process is ...
... spores that are formed , and these red summer spores , the uredospores , are thus enabled to drop off and float away upon the air to other wheat plants . If moisture is present they germinate at once , and the en- tire above process is ...
Página 165
... spores are formed . The floors of the cups start pali- sade - like chains of the spores , which , when mature , again take wings with the wind . These are the wheat infecting æcidio- spores with which we began , and the life cycle is ...
... spores are formed . The floors of the cups start pali- sade - like chains of the spores , which , when mature , again take wings with the wind . These are the wheat infecting æcidio- spores with which we began , and the life cycle is ...
Página 166
... spore beds beneath the bran layer , con- taining both uredospores and teleutospores that subsequently germinated . This demands a new line of investigation , for it has ... spores to the heading wheat . That the spores 166 THE BOOK OF WHEAT.
... spore beds beneath the bran layer , con- taining both uredospores and teleutospores that subsequently germinated . This demands a new line of investigation , for it has ... spores to the heading wheat . That the spores 166 THE BOOK OF WHEAT.
Página 167
... spores are thus brought to the wheat is shown by the fact that screened plants are not rusted , and that distilled water exposed to the air will gather great numbers of the spores in the short period of a half hour . The more soft and ...
... spores are thus brought to the wheat is shown by the fact that screened plants are not rusted , and that distilled water exposed to the air will gather great numbers of the spores in the short period of a half hour . The more soft and ...
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Términos y frases comunes
acre agriculture Amer American amount annual Argentina average baked bran bread bucket shop bushels bushels of wheat Canada cars cents per bushel century cereals Chicago chinch bug climate combined harvester commercial corn cost crop rotation cultivation durum wheat early elevators England Europe experiment station export factor farm farmers fertilizers flour germination gluten grower grown harvest header Hessian fly Hybrid important increased industry insects irrigation Kansas kernel land larvæ loss macaroni machine machinery manure methods miller milling Minnesota moisture nitrogen North Dakota operations Pacific coast phosphoric acid plow potash pounds practically price of wheat produced profitable railroads Red river valley Rept rotation Russia rust seed shipped smut soil sown speculative spores spring wheat storage straw supply threshing tion transportation United varieties weeds wheat crop wheat growing wheat plant winter wheat Yearbook U. S. Dept yield
Pasajes populares
Página 77 - Texas, Algeria, Central Asia, China, Japan, Morocco. June — California, Oregon, Mississippi, Alabama, Georgia, North Carolina, South Carolina, Tennessee, Virginia, Kentucky, Kansas, Arkansas, Utah, Colorado, Missouri, Turkey, Greece, Italy, Spain, Portugal, south of France. July — New England, New York. Pennsylvania, Ohio. Indiana, Michigan, Illinois. Iowa, Wisconsin, southern Minnesota, Nebraska, upper Canada, Roumania, Bulgaria, Austria, Hungary, south of Russia, Germany, Switzerland, south...
Página 36 - This preservation of favourable individual differences and variations, and the destruction of those which are injurious, I have called Natural Selection, or the Survival of the Fittest.
Página 77 - Columbia, Belgium, Holland, Great Britain, Denmark, Poland, Central Russia. September and October — Scotland, Sweden, Norway, North of Russia. November — Peru, South Africa.
Página 143 - Chief of the Bureau of Soils in the United States Department of Agriculture...
Página 126 - The conclusion logically follows that on the average farm the great controlling factor in the yield of crops is not the amount of plant food in the soil, but is a physical factor the exact nature of which is yet to be determined.
Página 243 - ... made under the rules of some commercial body, by which the conditions as to the unit of amount, the quality, and the time of delivery are stereotyped, and only the determination of the total amount and the price is left open to the contracting parties."* Another important class of transactions are "cash...
Página 130 - It appears, further, that practically all soils contain sufficient plant food for good crop yield, that this supply will be indefinitely maintained, and that the actual yield of plants adapted to the soil depends mainly, under favorable climatic conditions, upon the cultural methods and suitable crop rotation.
Página 125 - ... diversified in appearance and quality ; yet, as it was stated in the Introductory Lecture, they consist of different proportions of the same elements ; which are in various states of chemical combination, or mechanical mixture. The substances which constitute soils have been already mentioned. They are certain compounds of the earths, silica, lime, alumina, magnesia...
Página 137 - Barnyard manure contains all the fertilizing elements required by plants in forms that insure plentiful crops and permanent fertility to the soil. It not only enriches the soil with the nitrogen, phosphoric acid, and potash, which it contains, but it also renders the stored-up materials of the soil more available, improves the mechanical condition of the soil, makes it warmer, and enables it to retain more moisture or to draw it up from below.
Página 74 - We have ploughed, we have sowed, We have reaped, we have mowed We have brought home every load, Hip, hip, hip, Harvest home ! and thus, sir, the whole assembly shout