The consensus of fertilizer experiments suggests that potash is less
important on most soils than phosphorus and nitrogen but that if
these elements are in good supply, increased yields from potash are
likely.
Lanham in Texas was unable to find a relation between potash
fertilization and resistance to shipping hazards.
Stable Manure
Stable manure has long been recognized as useful for tomatoes. It is
generally considered better to apply it to the preceding crop or at
least the preceding fall than to use it just before setting of
plants. If spring application is necessary, it is better to use well
rotted manure. Stable manure is low in phosphorus. An approximate
statement would be that 10 tons of manure is roughly equivalent to
one ton of a 6-3-6 fertilizer. Thus, 1,000 pounds of 18%
superphosphate would bring the analysis to 6-12-6 which would be
generally regarded as a good balance.
A recent publication[11] from Pennsylvania emphasizes the value of
manures and of phosphorus.
Placement and Side Dressing
Recent experiments have shown the desirability of placing fertilizer
close to but not in contact with the roots of the young plants. When
newly set and before new roots have developed is the time when
nutrient material close at hand is needed to give the plant a
vigorous send-off. Transplanters have been devised with attachments
to place the fertilizer in bands at each side of the row of tomatoes
and about two inches deep.
Recent experiments, notably by Sayre[12] of New York, have shown the
advantage of dissolving fertilizer materials in the water used for
transplanting tomatoes. One combination of materials consists of
ammo-phos, 14-48, 2 parts and potassium nitrate, 1 part. Five to
eight pounds of this mixture are dissolved in 50 gallons of water
and about 1/4 pint or 1/2 cup is applied to each plant, usually by
the transplanting machine. There are other suitable mixtures of
nutrients for this purpose. A very small investment in starter
solutions has shown material increase in total yield. The practice
places immediately available nutrients in the soil at the time and
place to be of maximum usefulness to plants that have been severely
root-pruned and have not yet had opportunity to rebuild the root
system.
[Illustration:
_Courtesy Campbell Soup Co._
FIGURE 6.--Cultivating and side-dressing tomatoes.]
Another critical stage in tomato growth comes when much fruit has
been set in the clusters and demands upon plant and soil are
especially heavy. At this stage, side dressing with nitrogen is
helpful in maintaining plant growth and providing resources for
growth and maturing of fruit. On sandy or nutrient-deficient soils,
more than one side dressing may be advisable. Sodium nitrate is
commonly used but other materials are suitable after the soil has
warmed up. Side dressing with fertilizer in solution has been
recommended recently by Tiedjens of New Jersey.
III
THE BEST IN SEED IS NONE TOO GOOD
Public-domain text, read in full here on John Shaqi.
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