Category Archive: Tiedjens

Tiejens: Soil Acidity and Calcium Requirements

Article by V. A. Tiedjens

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DOES A SOIL ACIDITY TEST AS USED IN SOIL TESTING
LABORATORIES DETERMINE OUR CALCIUM NEED
IN OHIO SOIL?

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

Tiejens: Assimilation of Nitrogen

Article by VICTOR A. TIEDJENS

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FACTORS AFFECTING ASSIMILATION OF AMMONIUM AND
NITRATE NITROGEN, PARTICULARLY IN
TOMATO AND APPLE

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.

Tiejens: Available Calcium and Salt Balance

Article by Tiedjens

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AVAILABLE CALCIUM A FACTOR IN SALT BALANCE FOR VEGETABLE CROPS

By Victor A. Tiejens and L. G. Schermerhorn

Tiejens: More Food From Soil Sciences

More Food From Soil Science

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.”

 

Tiejens: Olena Farm, U.S.A. An Agricultural Success Story

Olena Farm, U.S.A. An Agricultural Success Story

By V. A. Tiejens

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“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.”