1912 University Of IL Bulletin 155 Plant Food in Relation to Soil Fertility TF9
1912 University Of IL Bulletin 155 Plant Food in Relation to Soil Fertility TF9
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1912 University Of Illinois Urbana Bulletin 155 Plant Food in Relation to Soil Fertility TF9
UNIVERSITY OF ILLINOIS
Agricultural Experiment Station
URBANA, JANUARY 1912
CIRCULAR NO. 155
PLANT FOOD IN RELATION TO SOIL FERTILITY*
BY GYrIL G. HOPKINs
I take it that the only justification for me to review the subject of plant food in relation to soil fertility or crop production is the fact that recent publications from the federal Bureau of Soils have strongly affirmed that there is no necessity of applying plant food in the restoration and maintenance of soil fertility.
Two principal questions are raised: First, Does plant food applied increase crop yields in harmony with recognized soil deficiencies and crop requirements? Second will the rotation of crops maintain the productive power of the soil by avoiding injury from possible toxic excreta from plant roots? I shall try to present facts and data and exact quotations rather than my own opinions...
1912 University Of Illinois Urbana Bulletin 155 Plant Food in Relation to Soil Fertility TF9
UNIVERSITY OF ILLINOIS
Agricultural Experiment Station
URBANA, JANUARY 1912
CIRCULAR NO. 155
PLANT FOOD IN RELATION TO SOIL FERTILITY*
BY GYrIL G. HOPKINs
I take it that the only justification for me to review the subject of plant food in relation to soil fertility or crop production is the fact that recent publications from the federal Bureau of Soils have strongly affirmed that there is no necessity of applying plant food in the restoration and maintenance of soil fertility.
Two principal questions are raised: First, Does plant food applied increase crop yields in harmony with recognized soil deficiencies and crop requirements? Second will the rotation of crops maintain the productive power of the soil by avoiding injury from possible toxic excreta from plant roots? I shall try to present facts and data and exact quotations rather than my own opinions...
