. Development and activities of roots of crop plants; a study in crop ecology. Roots (Botany); Plant ecology; Crops and climate. 72 Development and Activities of Roots of Crop Plants. (at 2 to 2.7 feet), gave the plants a root development quite out of proportion to the tops and markedly different from those of more moist soil. This root development agrees with earlier studies of cereal crops, including winter- grown varieties, and in many respects with that of the native vegetation of the short-grass plains (c/. Weaver, 1920). Summary of Environment and Crop Development at All Stations, 1920.