Northern Nut Growers Association Report of the Proceedings at the Fifth Annual Meeting: Evansville, Indiana, August 20 and 21, 1914
Science
Northern Nut Growers Association Report of the Proceedings at the Fifth Annual Meeting: Evansville, Indiana, August 20 and 21, 1914
Northern Nut Growers Association -- Periodicals; Nut trees -- Periodicals; Nuts -- Periodicals
nitrogenous fertilizers and cultivation, or, if necessary, by root
pruning. Root pruning should not be too severe as a sudden check on the
growth in the growing season might interfere more or less with the
storing up of "starch" or "dormant plant food" in the scion. Any
condition or conditions that will serve to induce early maturing and
ripening of the wood growth on trees from which buds are to be taken
will be satisfactory, and by using nitrogenous fertilizers and liberal
cultivation on the stocks to be budded, they may be kept in good
condition of sap well into September in average seasons. Grafted at the
proper time we were able to get good results without any manipulation of
the seedling stocks. All that we ever did there was to remove the new
growth occasionally to hold the stocks in good condition for grafting
and prolong the grafting season, and it was always questionable whether
this was a necessary precaution. My idea in keeping the new growth off
the stocks till the grafts were set was not to control the sap flow, but
to prevent, if it were possible by this means, the exhaustion of the
stored up "starch" in the stock, by the new growth. In the northern
states, the sap in the walnut stocks, and perhaps to some extent in
other nut tree stocks, is inclined to come up in the spring with a rush.
Some seasons at least, even before the buds push into growth, when the
stocks are cut off for grafting a large number "bleed" or run sap very
freely and this may continue several days, flooding and injuring the
scion, and exhausting the vitality of the stock. This condition was
especially noticeable the past spring, due presumably, to the lateness
of the growing season. Making provision for the exit of the surplus sap
was usually sufficient in the lower south and, we believed, would be
farther north, but with the stronger flow of sap this is not sufficient
in the northern states, at least some seasons. An examination of grafts,
set on stocks which have bled freely after having been grafted, shows
that the stock callouses very slowly, if at all, and the scion, unless
it be of very heavy, solid wood, becomes dark colored and sour and the
wood soon dies in the cleft, although the scion above this point may
remain green for weeks. I am not able, at this time, to give any
specific remedy for the correction of this trouble for the reason that I
have not worked it out to my own satisfaction as yet, but now that we
understand the trouble better, I feel sure that we will be able to
correct it in the manipulation of the stocks before they are grafted.
Keeping the new growth off the stocks may be found to be sufficient in
most seasons, if the grafting is done rather late, but I am of the
opinion that a rather severe cutting back of the stocks a few days
before they are grafted, if the grafting is done early, will be found
the best practice. For later grafting, my opinion is that two or three
cuttings, say a week apart, will be better.
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