Fertilizers for Cotton. Page: 12
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12
as compared with the half dose, also appears from the results of another
series of experiments with different nitrogenous manures in which full
and half doses of nitrogen were employed. In that series the half dose
of nitrogen in dried blood gave 6 pounds more lint than the full dose,
in the cotton-seed meal 33 pounds more, and in the ground cotton seed
7 pounds more.
It follows, therefore, that the three-quarter, full, one and one half,
and double doses were excessive, and that the difference in favor of
the half dose as compared with the quarter dose was not sufficiently
large to meet its additional cost.
The results of the preceding tests taken together show that a crop
of cotton yielding 300 pounds of lint per acre requires double the full
or theoretical amount of phosphoric acid, but only about one fourth to
one half the full amounts of potash and nitrogen.
DOUBLE DOSES OF TWO CONSTITUENTS.
In all the foregoing series of tests except one, two of the constituents
were constants, while the third was increased or diminished. It
was deemed advisable, in order to test the effect of increasing the
amounts of the two minerals (potash and phosphoric acid), or nitrogen
and one mineral, to carry on another series in which one constituent
should be taken as the constant and the other two as the variants.
This series was also intended to be a check upon those discussed above.
To present the results more clearly, the double doses of the two constituents
will be compared with the double and also with the single
doses of each.
Pounds.
1 potash and 1 phosphoric acid .................................... 318
2 potash and 1 phosphoric acid .. ... ...... .. ............. .... 329
1 potash and 2 phosphoric acid.................................... 386
2 potash and 2 phosphoric acid .. ................ ............ 358
(1) Double doses of the minerals.-In the tests under this head the
full dose of nitrogen was used in each case and is, therefore, not mentioned
in the comparison. In this and the two following statements of
results of yield of lint per acre the first three tests are taken from the
preceding series.
It is evident that doubling both minerals gave no better returns than
doubling only the phosphoric acid, for the difference between the averages
of the two applications did not exceed the probable error at either
farm. Their beneficial effects as compared with those of the other two
were doubtless due in both cases to the increased dose of phosphoric
acid.
(2) Double doses of nitrogen and potash.-In these tests phosphoric
acid (full dose) was the constant.
Pounds.
1 nitrogen and 1 potash ...................... ....... 318
1 nitrogen and 2 potash ..... .. ........................ 329
2 nitrogen and 1 potash ................................... .. 269
2 nitrogen and 2 potash ......................................... 268
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McBryde, J. M. Fertilizers for Cotton., book, 1895; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc6347/m1/12/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.