Chart showing how the presence or absence of various elements influences the uptake of other elements by plants.
Category Archive: Authors
Article by Presley and Leonard
J. T. PRESLEY AND 0. A. LEONARD
Published with the approval of the Director, Mississippi Agricultural Experiment
Station. Paper No. 140, New Series.
Received January 4, 1948
Article by V. A. Tiedjens
Soil samples from many sections of the United States and Canada show a paucity of
available calcium even though the pH reading seems satisfactory. Studies made on these
soils show that the pH test, accurate for most purposes, does not indicate the available
calcium in the presence of other fertilizer ions. A high pH does not necessarily indicate
adequate calcium in the soil.
THE OHIO JOURNAL OF SCIENCE 65(4): 227, July, 1965
Article by VICTOR A. TIEDJENS
Plants absorb ammonium and nitrate nitrogen in varying quantities,
depending partly on the rate of assimilation2 of either ion in the plant.
That certain specific conditions are necessary for the most efficient assimilation
of either form of nitrogen has been pointed out (40). Different species
vary in the efficiency with which they utilize the nitrate or ammonium ion
under a given set of conditions (29). The hypothesis that both ions probably
are finally utilized as ammonium, even though external requirements
may be different, involves an interesting study, a preliminary report of
which has been published (40). A continuation of these studies has established
certain relationships affecting the assimilation of nitrate and ammonium
nitrogen. Such factors as hydrogen-ion concentration and available
carbohydrates have a direct bearing on the assimilatory processes.
That these relationships vary with the source of nitrogen, and that the
location of the initial assimilatory processes varies with the type of plant,
will be pointed out.
Article by Tiedjens
By Victor A. Tiejens and L. G. Schermerhorn
By William A. Albrecht,
Published by the author, 1958. Public Domain material.
” “All flesh is grass,” were the words by which a prophetic pre-
Christian scholar revealed his vision of how the soil, by growing the
crops, can serve in creating animals and man. It duplicates to a
fairly good degree any concepts we have even now of the many
natural performances in the assembly line which starts with the soil
to give what we call agricultural production. We know that the soil
grows grass; that the grass feeds our livestock; and that these
animals, in turn as meats, are our choice protein foods. Along the
same thought line we may well consider the geological, the
chemical, the biochemical and the biological performances by
which the numerous streams of life take off from the soil and
continue to flow through the many healthy species of plants and
animals. We can, therefore, connect our soil with our health via
nutrition. Since only the soil fertility, or that part of the soil made up
of the elements essential for life, enters into the nutrition by which
we are fed, we may well speak of animal health as premised on the
by V. A. Tiejens
“JESUS’ FEEDING the Philistines with five loaves of bread and two
fishes was considered a miracle. If the Bible is true to facts, this
gives us something to think about. However, to grow 200 bushels
of corn where only 65 bushels grew before is no less a miracle,
because it means that we can feed three times as many people.
This yield can mean life or death for millions of earth’s inhabitants,
and can postpone the day of reckoning for several generations.”
By V. A. Tiejens
“At the northeast corner of Murray Road and U.S. routes 250
and 13, one half mile south of Olena, Ohio, lie sixty-eight acres
of what experts call submarginal land and about which the
neighbors say “Too poor to farm.” My friends say, “The land
should be good for something,” while my associates call it a
“challenge to your ability and vision.” For my purpose, it is ideal.
I wanted the poorest farm I could find, a farm so poor that the
average agronomist—with all his knowledge—would starve to
death on it.”