Nitrogen, which is used by the trees largely in making growth of leaf and wood, may be supplied from a number of different sources, viz: stable manure, cotton seed, cotton-seed meal, dried blood, fish scrap, sulphate of ammonia and nitrate of soda. These substances are the principal commercial sources of nitrogen. Large amounts of nitrogen are gathered by leguminous crops; cowpeas, vetch, beggarweed, velvet beans, alfalfa and others may be planted to advantage, resulting in a great saving in fertilizer bills, and besides, adding the necessary vegetable matter and humus. The most common source of phosphorus, usually referred to as phosphoric acid, is acid phosphate. Some is obtained from bone, and bone meal is a good fertilizer to use among pecan trees. The results obtained from its use are not immediate, but since the bone does not decay rapidly, they extend over a considerable period. On the whole, acid phosphate is as satisfactory as any material as a source of phosphoric acid, and the goods with the highest percentage are usually the most economical in the end. A good grade is that analyzing fourteen per cent. Potash may be purchased, as kainit, the raw salt, or as muriate of potash, low grade sulphate of potash and high grade sulphate of potash. Of these the sulphates are usually given the preference in fruit growing. Of the domestic sources of potash, woodashes are important. The amount of fertilizer which it is best to apply is difficult to decide upon; much depends on the character of the soil, what crops are cultivated and whether a crop of legumes is grown or not. If legumes are grown for the benefit of the orchard, they should be fertilized, and if the crop is turned back into the soil, this may be sufficient for the trees, particularly while they are young. For the legumes, a good fertilizer to use per acre is: Kainit, 100 lbs.; Acid Phosphate, 200 lbs. or, High-Grade Sulphate of Potash, 50 lbs. Acid Phosphate, 200 lbs. In any case some allowance should be made for the amount of nitrogen collected by the legumes. When corn, cotton or some other crops are grown in the orchard, fertilizing may simply consist in distributing an additional amount of the crop fertilizer for the benefit of the trees. For the growth of the young trees, a larger amount of nitrogen and a relatively smaller amount of phosphoric acid and potash are required, while for older trees, the reverse is true. Phosphoric acid and potash are required by bearing trees for the formation of fruit. Consequently, when the pecan orchard comes into bearing, these materials should be increased in the fertilizer applied. If the soil is not very rich at the time of planting, good results will follow the use of a pound of good commercial fertilizer at the time of planting.