Almond (hulled) 5.49 1.72 4.33 15.00 16.40 Almond (not hulled) 9.95 1.04 2.04 17.29 17.01 Walnut (hulled) 1.50 1.81 2.78 7.50 10.20 Walnut (not hulled) 8.18 1.55 1.47 12.98 5.41 Chestnut (hulled) 3.72 .71 1.89 8.20 8.00 Chestnut (not hulled) 3.67 1.20 1.58 9.52 6.40 Prunes (green) 2.66 .13 .53 4.03 1.48 Apricots (green) 2.83 .18 .71 5.16 2.29 Olives 8.85 2.32 1.18 94.63* 5.85 * 80.7 pounds of which is silica. _Humus._—A plentiful supply of humus in the soil is essential. It not only improves the physical condition of the soil, but assists drainage, moisture retention and in rendering the plant food available in sufficient quantities for the use of the trees and for the maturing of full crops of almonds. Many orchards have been very light producers year after year because of a deficiency of humus in the soil. _Drainage._—The almond root is very particular as to its air and moisture requirements in the soil. It will not endure standing water in the soil for any length of time, especially during the growing season. Exclusion of air by excessive moisture is believed to be one of the most productive causes of “sour-sap.” If allowed to continue for any length of time such conditions will cause the death of many or even all the roots and with them the top. _Water Table._—A factor which is very commonly overlooked in connection with the natural drainage of almond lands is the position of the water table at different seasons of the year. Great care must be exercised in choosing a location to be sure that the water table does not rise during the summer. This is a very serious problem in many irrigated sections. Where the water table during the winter months is less than 12 feet in depth it is highly desirable to have as little fluctuation as possible. Where fluctuations take place at a greater depth than 12 feet they are not generally serious. The ideal condition is where the water table is highest in the winter and quickly drops after the winter rains are over, to a depth of from 10 to 12 or 15 feet, remaining at that point during the remainder of the growing season. The soil in addition to being well drained, must be sufficiently retentive of moisture to supply the tree throughout a long, dry growing-season. If the soil will not retain a sufficient amount of the winter and spring rains, recourse must be had to irrigation to supply the deficiency. _Alkali._—Alkali lands are unsuited to almond culture and should be carefully avoided.