Mr. Maher: Plant your protection when you plant your apple trees, and you will have your protection sooner than you have your apples. If you are going to do that, don't put the shelter too close to the apple trees, which is a very common fault.
A Member: How much distance would you allow for the roots?
White Willow windbreak at Devil's Lake, N. D.
Mr. Maher: I should say not less than 100 feet, anyway.
Mr. Moyer: I live in southwestern Minnesota, about thirty miles from the South Dakota line, and I think it is a mistake to recommend the white spruce for planting out there. The white spruce naturally grows towards the North Pole, it extends even up to the Arctic Circle. Twenty-four years ago I purchased a dozen white spruce from Robert Douglas, who was then alive, and planted them northwest of my house. About five years ago they began to fail, and now only two or three are alive, and they are covered with dead branches. I feel sure that the white spruce have been injured by the hot winds that come across the prairies from the southwest. I don't think they can stand it. There is a variety of white spruce that grows in the Black Hills, which I think will be decided to be a different species when botanists come to study it, that will stand our prairies. Another tree that we like is the Colorado blue spruce; it is hardy and grows excellently. About twenty-three years ago, when Professor Verner was at the head of the Forestry Department at Washington he sent me 8,000 evergreens, and I set them out. They were bull pine and the Scotch pine and Austrian pine. I was over to look at them the other day. The Scotch pine, which have been set now twenty-three years, are over thirty feet high, the Austrian pine about two-thirds as high, and the bull pine, Ponderosa, is about as high as the Austrian pine. He told me to set these trees about two feet apart each way. I thought that too thick, so I set them in rows six feet apart and about two or three feet apart in the rows. He wished me to alternate the planting with deciduous trees. He recommended that I add a few deciduous trees, green ash and box elder and a few elm, and I set them as far as they would go, but they didn't go very far in setting the 8,000 evergreens. Then I thought it would be a good idea to use the wolfberry that grows wild on the prairies. I set them alternately with some of the evergreens, but as they have a very liberal root system it was hard to get them out. The finest tree in the plantation is the Austrian pine, and if it continues to do as well as it has the last three or four years I think the Austrian pine is going to be a very valuable pine for shelter-belt.
Mr. Kellogg: Have you tested the Douglas spruce?
Mr. Moyer: Not to a great extent. It does well in some localities.
Soft, or Silver, Maple windbreak—to be succeeded by permanent windbreak of Bur Oak—shown growing between man and boy.