While I hope to experiment for forty more years on my mountain side in the attempt to cover it with waving fruitful trees that are so immune to pests as not to need spraying, I shall never again be caught with only one possibility upon a given piece of land. If I should top-work my native hickories to shagbark, which I know involves considerable waiting and considerable uncertainty, I can, with very little expense, put upon the same ground a full stand of grafted black walnuts and a full stand of budded pecans, or if I do not care to go to that much trouble, I can graft my hickories and plant my native black walnuts and merely keep them there in submerged condition as reserve trees ready to be grafted at any time. For a pecan orchard I can do exactly the same thing, using black walnuts as fillers, possible successors, or as ungrafted reserves. For the Persian walnut, the black walnut can again come in as a filler or as a reserve, and for grafted blacks of any variety, other blacks can be kept waiting for the arrival of possible better varieties which could easily become the head of the corner.
My experience with transplanting seedling pecans shows that they, too, can, without serious difficulty, be planted out in such rough land and kept waiting there for years until the day of possible utilization.
Lastly, I wish to emphasize one more possible crop insurance tree for the man who is planting nuts on land difficult of cultivation, or entirely untillable, and that is the persimmon. I have paid my respects above to the tilled crops and the pastured pig for the arable land, and for the unarable land I would still emphasize the pig and give him other sources of food to supplement pasture. Among these possible foods is the persimmon which as yet has been little appreciated in an extensive way, although hundreds of thousands of men know it is highly prized forage and of considerable fattening value. It has a crop insurance virtue, however, other than its acceptability as pig feed. That is the hardiness of the tree and the ease of establishing it. In my pasture lot the Angora goat, even when pushed with hunger, has not touched persimmon wood or leaves. The same is practically true of the black walnut and of the butternut. This fact is one of great importance, because it means that we can keep rough land in pastures, even goat pasture, during the period when we are planting out tall-headed nut trees of almost any variety, and at the same time have a perfect stand of two kinds of crop insurance trees coming along, namely, walnuts and persimmons.
In this connection it is desirable to point out the relation of this recommendation to the actual practice in nut growing regions of Europe. They do not plant a little two or three foot tree. They plant an eight or nine-foot tree often so slight it can not hold itself up, and is kept in place by one or two stiff poles. This tall-headed fellow stands out in the middle of the wheat field, the vineyard, the hay field, the goat pasture, the cow pasture, with its head entirely out of reach of the pasturing animal, its trunk protected by one or two stout sticks, and in due time it takes hold. With the trees properly developed in the nursery, I know of no reason why the same practice cannot prevail here, and I have at least one Busseron pecan tree that has gone safely through the first summer of it.
The practice of one pecan grower in Texas, reported in the Nut Journal, is suggestive of a crop insurance practice capable of wide use in the North, namely, planting of filler trees of quick-yielding varieties. There is no reason why the northern nut trees might not be planted 40, 60, or 80 feet apart in peach or even apple orchards, as did the Texas man with his nut trees 72 feet apart, occupying every fourth place in an 18-foot spaced fig orchard. I would call attention of Northerners, however, to the desirability of the mulberry, the most rapid growing and cheapest of all our fruit trees, doing well in Carolina at a space of 30 feet, which would enable the Northerner, by a little variation of the interval between his mulberry trees, to plant nut trees anywhere from 60 to 100 feet apart.
Sod Mulch Nut Orchards.
I know that any suggestions of the production of trees without plowing is unorthodox, and therefore not likely to be heard straight, and particularly perilous in the presence of professional horticulturists in state or national employ. To such I wish to call attention to the fact that I have emphasized in this matter, first, the tillage methods, and that I am making no knock against cultivation. We all know that it works under some conditions, and we all also know that there are some conditions in which it will not work. If I lived on level, sandy loam, I'd be a furious tiller of tree crops fifteen times a year. But I was born upon a rocky hill, and now I live upon another that is higher and rockier, and I don't believe in tilling it fifteen times a year. Must I abandon it, or adopt uses to its conditions? Out of these conditions mulch orcharding has come. Despite the orthodox, I know that the growing of some kinds of fruit trees without cultivation has passed the experimental stage. At this moment millions of barrels of apples are approaching perfection in orchards in Virginia and other eastern states that have not been plowed for more than one, and sometimes for more than five seasons. The application of this method to nut trees is still in the embryonic stage, with theoretic factors favoring it.
I do not know how far the mulch-fertilizer method can go, but I am sure it may go much farther than most professional horticulturists will admit. I find that the pecan tree starts off nicely under the mulch fertilizer conditions of the apple. The walnut tree has certainly done it for ages with less aid, and I believe it is up to us to find methods of handling land and trees and moisture which will enable us to avoid the danger, costs, and difficulties of plowing rough land and still get good trees. For example, the absence of cultivation does not necessarily imply the absence of fertilizer. The way a few black walnut trees in my apple orchard have snapped their buds and grown in response to the nitrate of soda that has been put upon the apple trees beside has been little short of astounding. The way a poor little starveling persimmon wakes up when the same treatment comes along, is equally interesting. I cannot speak definitely yet about the influence of fertilizer on the Persian walnut or the pecan.
In connection with the fertilization matter, it is well known that a crop of clover or other legumes is very important as a part of the rotation of crops in plow agriculture. Similarly I expect great value can be obtained in our pastured and fertilized nut orchards if we so treat the soil with lime, phosphorous, and whatever else is needed, to give a good mat of white clover and other legumes which are undoubtedly a good nitrogen supply for trees whose roots interlace with theirs.
Similarly I see great possibilities in the interplanting of some leguminous crop tree such as the honey locust or the Kentucky coffee bean in our nut orchards. It is true neither of these trees has yet been selected and developed to the crop point, but they are much more promising than Sargent says the wild Persian walnut was at its beginning. It is an established fact that a non-leguminous plant can take nourishment from the nitrate-bearing nodules on the roots of adjacent living legumes, to say nothing of its well-known ability to feed upon the nitrate collections of legumes that have lived in past seasons within reach of its roots. Thus the interplanting of a legume and a nut tree seems to promise a continuous supply of the all-important nitrates for the nut tree.