The staple farm crops of the region are often preferable to specialty crops, particularly from the labor standpoint. Corn, wheat, oats, potatoes, and legumes can all be grown with a minimum of labor and the use of power machinery. There is less risk involved with farm crops than with specialities, both in securing an adequate crop and in the price received for the product. Fruit, vegetables and ornamentals often have very critical requirements. They must be sprayed, harvested, and shipped at exactly the right time or all the proceeds will be lost. Staple crops are not so demanding in either culture or harvesting. The labor distribution throughout the season or even throughout the year must be considered and well planned in advance. No two crops should require exact and demanding attention at the same time. They should be chosen and planted so that a regular, even distribution of labor can be maintained with as little of a rush period as possible and yet with a minimum of idle time. The general agricultural pattern of the region must be considered. In a sparsely settled grain and livestock region it would be quite inadvisable to grow strawberries or other crops which require a maximum of hand labor during a very brief period. Berries, however, may be perfectly well suited to sections where either transient workers or city children can be secured with little effort. The crop should suit from the ecological viewpoint. It must not compete with the young, growing trees for mineral food and water, particularly during spring and early summer when the trees make most of their annual growth. On the other hand, if planted too close to the trees, some intercrops may be shaded too severely to produce a normal yield. Success in intercropping is usually found between plants which are quite dissimilar in form and habit. Black walnuts and pasture grasses furnish a typical example. The long taproots of the walnuts penetrate deeply into the soil, while the grass roots are shallow and fibrous and feed in the soil surface layer. The aerial portions of these plants are likewise quite different, the walnuts tower high in the air, while the grasses form their crowns on the very surface of the ground. The light shade cast by the walnuts does not interfere with the photosynthetic activity of the grasses, but it is sufficient to discourage growth of broad-leaved weeds which have a higher light requirement than that of grass. This light shade also tends to provide a greater supply of available moisture for the grass, in that it reduces temperature and, consequently, water loss from the grass and soil by keeping down both transpiration and evaporation.