1. Some Effects of Soil Compaction on Root Growth

Root growth and nutrient uptake are obviously related, and yet not well unders tood under field conditions . An oversimplified premise is that plant roots must grow to the site in the soil where the nutrients are retained, or that the nutrient must move to the absorbing root sur-face (or both). Relationships developed under well controlled uniform laboratory conditions of ten do not extrapolate to field conditions. In this respect, progress is often hindered by the fact that root growth measurements...