Moisture; Rainy,
dry, average
Clusters: Size 1947 1948 1949 1950
Range in number of nuts
per cluster
Production: Size of crop in proportion to size of tree
1947 1948 1949 1950
Percentage of unfilled nuts:
1947 1948 1949 1950
R*H
——————————crop
pounds
* R = 1/2 limb spread.
* H = height; lowest branch to top.
In addition to these data, photographs, both in black and white, and in color, were taken of the trees and often of the surroundings, and a map made so that the trees can be located in the future by any one wishing to do so.
For examination by any one wishing to do so, there are on the secretary's desk copies of the case histories, as written up, of the first and second prize winners, the Duke and the Burson.
A careful study of these ten trees has not revealed any single factor that can be pointed to as essential to the production of a superior walnut variety. They were found on good and on poor soils, on good and poor sites, in soils of a wide range of pH values from very acid to alkaline in reaction. Most of the trees were located in the southern part of the state at 39° to 40° North Latitude, but it is hard to imagine that the latitude has any specific effect on the superior qualities of the nuts.
In all cases where the trees were now standing in impoverished soils, low in humus, fertility, and in pH value, it was quite evident that the soil was probably in far better condition when the trees got their start fifty to a hundred or more years ago.