earloracion15-
Jan Baptista Van Helmont
His willow tree experiment "proved" that water was the sole nutrient of plants.
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Sir Frances Bacon
Believed: - water = principle plant nourishment - soil = kept plant upright and insulated from extreme temperature
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John Woodward
Plant growth is influenced by something other than water
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Jethro Tull
Roots ingest soil particles & cultivation made it easier for plants to take up soil
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de Saussure
- The soil provides only small amounts of nutrients required by plants - Plants obtain C from the air - The increase in mass of the plant as it grows could not be due only to uptake of CO2, but also to the uptake of H
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de Saussure
he outlined the basic reaction by which Plants convert CO2 and water to glucose
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Humus theory
plants live on humus-derived extracts (C, H, O, N) from which they are able to rebuild more complex plant tissue
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Albrecht Thaer
he believed the Humus theory
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Albrecht Thaer
he believed that An internal vital force of plants allows to generate other vital nutrients from four elements in humus -
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Albrecht Thaer
he believed Fertilizer salts and lime good b/c promote humus and OM breakdown
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Philip Carl Sprengel
a student of Thaer
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Philip Carl Sprengel
Came up with a list of compounds required for plant growth and discussed the idea of fertilizers
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Philip Carl Sprengel
he stated the law of minimum
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Ca, Mg, K or alkali metals
were needed to neutralize acids formed by plants
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Phosphates
are needed to neutralize acids formed by plants
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Justus von Liebig
Laid the foundation for the modern fertilizer industry
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P and K with lime
He manufactured fertilizer but made the mistake of fusing with what elements
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Justus von Liebig
he popularized the law of minimum
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Nickel
latest discovered essential elements
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Jethro Tull
. He wrote the book “Horse and Hoeing Husbandry” and developed the horse hoe and the seed drill.
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Pietro de Crescenzi
published a book on agricultural practices.
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Marl
during the greek period this was used to increased productivity of soils or as a liming material
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Taste test
during the greek period saline soils were tasted using
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Shifting cultivation
refers to any temporal and spatially cyclical agricultural system that involves clearing of land—usually with the assistance of fire— followed by phases of cultivation and fallow periods
