A good fertilizer for young trees should analyze five per cent. phosphoric acid, six per cent. potash and four per cent. nitrogen. For bearing trees, one analyzing eight per cent. phosphoric acid, ten per cent. potash and four per cent. nitrogen will give good results. If so desired, well-known brands of commercial fertilizers, having approximately the above analysis, can be purchased in the markets, but if preferred, the several materials may be purchased separately, then mixed and applied. APPLYING THE FERTILIZER. The roots of young trees do not extend to any great distance away from the trunk. In distributing the fertilizer this fact should be remembered. A safe rule for all small-sized trees is to commence just outside an imaginary circle of two feet radius and apply the fertilizer in a circular band extending out some distance beyond the spread of the branches. Old trees, or those having a considerable spread of top, when planted in orchard form, should be fertilized by broadcasting the fertilizer over the ground. In the northerly pecan sections, all the fertilizer should be given in one application, about the time growth starts in spring, and plowed in, while farther south, two applications may be made, one at the time mentioned above, the other from the first to the middle of June. CHAPTER XII. PRUNING. The pruning of the pecan is neither difficult nor complicated. In short, after the top of the tree is well started, little need be done except to cut back a branch here and there that the trees may develop well-rounded, symmetrical tops. A splendid type of tree is shown in Plate VI. HIGH VS. LOW-HEADED TREES. Frequently trees are so pruned that their first branches are eight or ten feet from the ground. Even young trees are pruned to slim stems, surmounted by a small umbrella-like top. Such trees frequently have to be tied to a post to keep them upright until such time as they attain sufficient size to support themselves. Such pruning should not be countenanced. The trees will make a much more rapid and satisfactory growth, and their trunks will be less affected by the hot sun, if the branches are allowed to develop lower down. Sometimes the system of pruning pecans with tall, bare trunks is adopted to allow of crops being grown under the trees, or because it is desired to use the ground as a cattle pasture. These considerations should not weigh against the welfare of the trees. As much ground can be cropped around low-headed trees as is good for them, and, in brief, the cows should be pastured elsewhere. Ordinarily the top of the tree should be so shaped that the lower branches will be about four feet from the ground. The trunk will be shaded and protected, the crop will be nearer the ground, and the low tops will be less subject to the destructive force of heavy winds, so injurious to both fruit and branches.