1. A typical square meter of vegetation was selected in the upland, Andropogon scoparius
prairie on Lancaster loam soil, near Lincoln, Nebraska, and another in the lowland, A …

Knowledge of the soil as a medium for the growth of roots has increased very greatly in the
past three decades. Earlier studies on the root depth and distribution of native Midwestern …

Data on the depth and spread of 31 species of trees and shrubs were collected at Fargo,
North Dakota. The average rainfall in this area is 22.34", but for the past 15 years it has been …

IN a study2 of the distribution of vegetation in Kent county, Michigan, made by the author
several years ago, the tentative conclusion was reached that the controlling factor in the …

Since the supply of water in this region is the chief limit factor to plant growth, we shall first
consider the total am of precipitation, with its seasonal distribution (which is of g importance …

These studies include some of the more common weeds which have become serious on
agricultural lands because of their creeping underground parts. Two specific phases of the …

It is generally recognized that roots play an important part in the growth of higher plants,
since they serve as anchorage organs, repositories of food re-serves, occasionally as …

During recent years considerable attention has been directed to the study of the root
systems of various agricultural plants. These studies have not been prompted entirely by …

1. During a 6-year period, in which the weather was exceptionally favorable for a study of the
minimum moisture content of the subsoil, moisture studies were carried out on Nebraska …

Plants other than grasses constitute an important part of the native grasslands of North
America. M\4ost of these are forbs, a few are shrubs and half-shrubs. Probably 85 to 90 …