 | American Seed Trade Association - 1902 - 1288 páginas
...affirms : "That practically all soils contain sufficient plant food for good crop yields, that the supply will be indefinitely maintained and that this...mainly, under favorable climatic conditions, upon cultural methods and suitable crop rotations." It is safe to say that no statement in recent years,... | |
 | United States. Office of Experiment Stations - 1903 - 1218 páginas
...practically all soils contain sufficient plant food for good crop yield, that this supply will be definitely maintained, and that this actual yield of plants adapted to the soil \ Part» унт million of oven-dried soil. Number of analyse». Phosphoric acid (PO,). Nitric acid... | |
 | Association of American Agricultural Colleges and Experiment Stations - 1904 - 358 páginas
...sufficient plant food for good crop yields, that this supply will be indefinitely maintained, ami that the actual yield of plants adapted to the soil depends...the cultural methods and suitable crop rotation." It is further asserted 6 that this is " a conclusion strictly in accord with the experience of good... | |
 | Massachusetts. State Board of Agriculture - 1905 - 812 páginas
...from the soil." " 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,... | |
 | Massachusetts - 1905 - 1118 páginas
...from the soil." " 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,... | |
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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,... 