Last fall I was out on a farm in the foothills some 70 miles from Lexington, in a place that most of you folks wouldn't want to live in and call home, a little farm, probably 16 acres, with a widow lady probably 65 years old, living there with her daughter. And among other things, she said, "Mr. Magill, I understand that you are supposed to know something about nuts. See that tree standing right out there?" She says, "I will give you a $20 bill if you will tell me how to make that nut tree bear annual crops."
Well, I was a little bit surprised. I listened, and I got to asking her questions. Some member of the family had gone to Chicago years ago, and she knew about all the black walnut packing firms in Kentucky. This relative had worked in the market, and had indicated she could get a dollar a pound for all the nut meats she would pick out and send to this relative in Chicago. And that nut tree meant about 30 to 35 dollars a year when it had a crop but only bore every other year.
Well, that drove home just a little more to me than ever before the question of why certain nut trees bore and others didn't bear. To that lady there it meant $30 the year it bore and no income from that tree on the year it didn't bear. And she stood there beside the home and pointed out other trees that bore regularly. And she said, "Why do they bear regular crops and this good tree that makes so many fine, big kernels bears every other year?" That's a challenge I am throwing out to this audience today to all the members on this panel.
I am hoping that Pappy Ward or Friend Chase will answer that question completely. The thing I have in mind, is that in a group like we have here today, as many nuts as we have got here, if we think about this question and talk to the folks back home, I believe in a year or two we can have worked out and have printed in the records of the report some pretty reasonable answers as to why nut trees don't bear, or why they bear heavy crops on certain years and are off certain years.
Mr. Ward, I know you have observed this over a period of years. What, in your opinion, is the one factor that is more responsible for this alternate bearing of black walnuts?
Why Black Walnuts Fail to Bear Satisfactory Crops
W. B. WARD, Department of Horticulture, Purdue University, Lafayette,
Ind.
When man or nature, and sometimes both, change the natural habits of a tree, most anything can happen. There are years when the black walnut sets very few fruits either on the seedling trees or trees of named varieties. Some few trees have alternate years of production, while other trees bear annually and some not at all. Good results and good crops may be expected only when several factors are normal and conditions favorable. After twenty years of keeping records and observations on nut trees and through correspondence with other growers, I consider the main reason for crop failure or light production to be climatic conditions and the weather for an entire year.
The black walnut produces a pistillate flower at the end of the present season's growth. The staminate flowers, or catkins, come from last year's wood. Good growing conditions are desirable for wood growth and fruit bud formation and any retarding of growth the previous season means little or no production. Winter injury to wood and bud, diseases or insects attacking the foliage, soil moisture, and summer temperatures will lower tree vitality. There are times when strong vigorous trees fail to fruit which could be due to a high or low carbohydrate-nitrogen balance. Soil type, plant food, age of tree, and location will have some influence on annual or even biennial production but yet are not the all important reasons for light crops.
The pollen of the black walnut is mostly wind borne as few insects ever visit the flowers and pollination is dependent on wind borne pollen. Trees planted in groups and close together are generally more productive than trees planted in orchard rows even as close as 40' by 40'. When the weather is cold and rainy during bloom, one should not expect much of a crop.