Development and Activities of Roots of Crop Plants: A Study in Crop Ecology

Authors

J. E. Weaver, University of Nebraska-Lincoln
Frank C. Jean, Peru (Nebraska) State Normal School
John W. Crist, University of Nebraska-Lincoln

Date of this Version

1922

Comments

Published by the Carnegie Institution of Washington, Washington, D.C., May 1922.

Abstract

Introduction
I. INVESTIGATIONS AT PERU, NEBRASKA, IN 1919.
University No. 21 oats, Avena sativa
Swedish Select oats, Avena sativa
Durum wheat, Triticum durum
Marquis wheat, Triticum aestivum
Manchuria barley, Hordeum vulgare
Corn, Zea mays indentata
Earlier investigations of corn
Potato, Solanum tuberosum
Earlier investigations of potatoes
Comparison of root systems
Environmental conditions of growth
Summary of root development
II. INVESTIGATIONS AT LINCOLN, NEBRASKA, IN 1919 AND 1920.
Oats, Avena sativa
Barley, Hordeum vulgare
Wheat, Triticum aestivum
Alfalfa, Medicago sativa
Sweet clover, Melilotus alba
Comparison of root systems
III. INVESTIGATIONS AT PHILLIPSBURG, KANSAS, IN 1920.
Oats, Avena sativa
Barley, Hordeum vulgare
Wheat, Triticum aestivum
Alfalfa, Medicago sativa
Sweet clover, Melilotus alba
Summary of crop development
IV. INVESTIGATIONS AT BURLINGTON, COLORADO, IN 1920.
Wheat, Triticum aestivum
Oats, Avena sativa
Barley, Hordeum vulgare
Alfalfa, Medicago sativa
Sweet clover, Melilotus alba
Summary of crop development
Summary of environment and crop development at all stations, 1920
V. INVESTIGATIONS AT ALL STATIONS IN 1921.
Investigations at Peru, Nebraska
Investigations at Lincoln, Phillipsburg, and Burlington
Summary of environment and crop development
Correlation of crop development with that of native vegetation
VI. DEPTHS AT WHICH PLANTS ABSORB WATER AND NUTRIENTS.
Preliminary experiments
Field experiments, 1920
Greenhouse experiments, 1920-21
Field experiments, 1921
Summary
Bibliography