Northern Nut Growers Association Report of the Proceedings at the Twenty-Fourth Annual Meeting: Downington, Pennsylvania, September 11 and 12, 1933
Science
Northern Nut Growers Association Report of the Proceedings at the Twenty-Fourth Annual Meeting: Downington, Pennsylvania, September 11 and 12, 1933
Northern Nut Growers Association -- Periodicals; Nut trees -- Periodicals; Nuts -- Periodicals
On several occasions discussions of root toxicity between the black
walnut and certain of its neighbors have taken place at Association
meetings. The theory that black walnut trees give off toxic properties
from their roots, which are fatal to other plants, is therefore not new.
Some years ago the Virginia Experiment Station definitely isolated a
toxic substance which was held responsible for the death of tomatoes,
potatoes, alfalfa, blackberry plants and apple trees when these other
plants were grown in close enough proximity for their roots to come in
contact with those of the black walnut. This work was reported in
various publications and was written up by several different authors.
Since then, as well as before, the writer has looked for similar
evidence, but, so far, in vain. Each of these crops, including tomatoes,
potatoes, alfalfa, blackberries and apples, have been seen growing in as
close contact with black walnut as they could possibly be placed.
Oftentimes they have been found much nearer to black walnut trees than
would have been wise to place them to oak, hickory, ash or other species
of large growing trees. This does not mean that when the roots are in
actual contact the toxic agent of the black walnut roots would not prove
fatal to the other plants but it does indicate that in the great
majority of cases there is no practical danger.
Anyone who has doubt about the healthy condition of these other species
when grown close together with black walnut trees, may obtain evidence
for himself by noting the frequent combination of this sort easily found
in fields and gardens of the country and small towns. It is surprising
how often these combinations of black walnut and other species are to be
seen. Any unprejudiced person could hardly fail to become convinced
that, in the great majority of cases, the danger is of small practical
consequence. The roots of the black walnut run deeply under ground and
it is entirely conceivable that in deep soil they do not ordinarily come
up to the shallower levels of the roots of most other species.
Summary
A summary of the year's developments might be arranged about as follows:
(1) More black walnut kernels were harvested and consumed during the
year than ever before.
(2) Prices to the farmer reached about the same low level of the year
preceding, but the total drop during recent years was probably not in
proportion to the drop of most other food products.
(3) Crop prospects in 1933 are unfavorable for another large crop.
Prices are starting out considerably higher than for several years.
(4) Production of black walnuts from grafted trees under cultivation is
altogether insignificant in comparison with that from chance seedlings
receiving no special cultivation.
(5) Grafting and planting are taking place at too moderate a rate to
materially alter the ratio of production from seedling to that of
grafted trees in the near future.
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