Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report: Wooster, Ohio, September 3, 4, 5, 1946
Science
Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report: Wooster, Ohio, September 3, 4, 5, 1946
Northern Nut Growers Association -- Periodicals; Nut trees -- Periodicals; Nuts -- Periodicals
With one exception, all nuts in the two tests were planted April 3,
1941. One of the two lots stored dry was soaked in water for five days,
then planted April 7. Seedbeds were equipped with screen wire cloth at a
depth of 10 inches.
~Results~: In both tests, fall nut planting resulted in the best
germination. Germination was higher for nuts planted in the fall than
for nuts stratified on the same day for spring planting, although the
difference was significant only in the second test. Outdoor
stratification produced the best results, followed in order by indoor
stratification at 38-40 deg. F and 45-50 deg. F. None of the nuts stored dry
germinated. Time of stratification proved to be important. Any delay
after November 28 resulted in reduced and retarded germination and
consequently smaller seedlings.
Depth of Planting and Seed Orientation
The effect of planting depth on germination and on seedling size was
investigated by planting black walnuts one, two, three, and four inches
deep. Other nuts were planted in three positions: (1) radicle end up,
(2) on side, and (3) radicle end down.
~Results~: Germination was unaffected by any of these treatments. The
emergence of the seedlings was retarded by deep planting and hence the
final diameter of seedlings was smaller. There was little difference in
seedlings from nuts planted one and two inches deep but they were
noticeably larger than those planted 3 and 4 inches deep. Planting nuts
with the radicle end down invariably produced seedlings with undesirable
crooks in the root-stem region which made them unsuitable for grafting.
Planting nuts radicle end up produced straighter seedlings than planting
them on their side. The latter method was the most economical for
nursery practice.
Seed Size
To study the effect of kernel size on size of seedling produced in the
nursery, nuts from nine wild trees and Thomas nuts were planted. Kernel
weights ranged from 1.21 to 5.61 grams; nut weight from 6.5 grams to
24.3 grams.
~Results~: With one exception where germination was poor, nuts with
small kernels produced small seedlings and nuts with large kernels
produced large seedlings. Under nursery conditions the need for
uniformly large seedlings for budding and grafting is apparent. The
results of this study indicated the desirability of using seed nuts with
large kernels for production of understocks.
Seedbed and Budding Studies
Density of stand in seedbeds influences seedling size. As size of
seedling is important in budding and grafting black walnut, information
on the most desirable spacing in seedbeds was needed. In three seedbeds
Thomas nuts were planted in three nut spacings: 4 x 4 inches, 5 x 5
inches, and 6 x 7 inches. In other plots nuts were planted 4 x 4 inches
and after emergence the stand was thinned. All seedlings from the
thinning test were set out in nursery rows the following spring and
those large enough were budded in the summer.
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