The Book of Wheat: An Economic History and Practical Manual of the Wheat IndustryO. Judd, 1908 - 369 páginas |
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Página 171
... larvæ that soon turn greenish , and descend to just above the roots , or , if the wheat has jointed , to the base of the particular leaves on which they were hatched . Sucking the juices from the growing wheat plant , these larvæ attain ...
... larvæ that soon turn greenish , and descend to just above the roots , or , if the wheat has jointed , to the base of the particular leaves on which they were hatched . Sucking the juices from the growing wheat plant , these larvæ attain ...
Página 172
... larvæ are not known to survive except on wheat , barley and rye . The fly A HESSIAN FLY : a , ADULT ; b , PUPA ; c , LARVA . ENLARGED is now known to flourish even where spring crops are exclusive- ly grown . EFFECT OF LARVAE ON WHEAT ...
... larvæ are not known to survive except on wheat , barley and rye . The fly A HESSIAN FLY : a , ADULT ; b , PUPA ; c , LARVA . ENLARGED is now known to flourish even where spring crops are exclusive- ly grown . EFFECT OF LARVAE ON WHEAT ...
Página 176
... larvæ which extract the milky juice from the embryos forming in the wheat heads , thus causing the grain to shrivel and the heads to blight . In cases of unusual outbreaks the average losses of whole states have been from two - thirds ...
... larvæ which extract the milky juice from the embryos forming in the wheat heads , thus causing the grain to shrivel and the heads to blight . In cases of unusual outbreaks the average losses of whole states have been from two - thirds ...
Página 178
... LARVA ; C , YOUNG devouring everything in their path . If they are numerous enough to LARVA . NATURAL SIZE . devastate a region , they are forced to feed upon one another , and immense numbers perish from debility and starvation . They ...
... LARVA ; C , YOUNG devouring everything in their path . If they are numerous enough to LARVA . NATURAL SIZE . devastate a region , they are forced to feed upon one another , and immense numbers perish from debility and starvation . They ...
Página 182
... LARVA . ENLARGED It became domesticated ages ago , lost the use of its wings , and is now strictly an indoor species . After the grain of wheat is punc- tured by the snout of the female , an egg is inserted . The resulting larva makes ...
... LARVA . ENLARGED It became domesticated ages ago , lost the use of its wings , and is now strictly an indoor species . After the grain of wheat is punc- tured by the snout of the female , an egg is inserted . The resulting larva makes ...
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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