RELATIONS OF SOIL AIR TO ROOTS AS FACTORS IN PLANT GROWTH

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Abstract
Soil productivity is often limited by the physical properties of the soil and especially by the soil structure. Literature is cited which, in general, points out the effect of aeration on crop response, the physiological effects of soil O2, the O2 requirements of plants, and the harmful effect of excessive CO2. The proportion of CO2 in the soil atmosphere decreases with the increse in number of noncapillary pores. The number of noncapillary pores increases as a granular structure increases. Granular structure, in turn, is promoted by proper soil management. Occasional deep tillage, decreased cultivation, organic matter addition, and crop rotations involving deep rooted legumes and grasses can, in most cases, improve soil structure. 55 references are cited.