Page:Tree Crops; A Permanent Agriculture (1929).pdf/268

 as follows: 1906—eight bushels; 1908—six bushels; 1910—twelve bushels; 1912—nine bushels; making thirty-five bushels in all. The tree is an every-other-year bearer, but has borne lighter crops of from one to three bushels in its off years: and as far back as I have known the tree, it has borne a good crop every other year and a light one between. After 1912 the land changed hands and the owner has gathered this tree, but kept no definite record except the crop of 1922, which was 600 pounds." This tree was 90 feet high, 100 feet spread, trunk four feet in diameter. An acre could only hold three of them,

Such trees are not very common, but there have probably been thousands like it; and there are now probably hundreds of them alive and bearing at this moment.

An observer in Texas says, "Native trees here have a habit of producing a full crop about once in two years. Many native trees have a record of over five hundred pounds' production in one year." Claims apparently authentic are made for trees that yield a thousand pounds and even more. The variation in the yield of supposedly meritorious trees under definite test