TY  - BOOK
AU  - Klages,K.H.W.
TI  - Ecological crop geography
U1  - 630.2815 20
PY  - 1942///
CY  - New York
PB  - Macmillan
KW  - Crops and climate
KW  - Crop zones
KW  - Agriculture
KW  - Economic aspects
N1  - CONTENTS

PART I : THE SOCIAL ENVIRONMENT OF CROP PLANTS
The scope of ecological crop geography
The historical background to agricultural production
Population in relation to agricultural development
Factors determining world centers of population and agricultural production
The social environment

PART II : THE PHYSIOLOGICAL ENVIRONMNET OF CROP PLANTS
The physiological environment
External factors in relation to development
Physiological limits
Crop yields and variability in relation to the ecological optimum
Adaptation

PART III : THE ECOLOGICAL FACTORS
General aspects of moisture relationships
Quantitative aspects of moisture relationships
Humidity provinces
The use of water by plants
Special responses of crop plants to the moisture factor
Temperature
Temperature efficiencies and bioclimatics in relation to crop distribution
Light
Air Movement
Classification of climate
Edaphic and physiographic factors

PART IV : THE GEOGRAPHICAL DISTRIBUTION OF CROP PLANTS
The small grain crops
The coarse cereals
Edible legumes
Potatoes, sweet potatoes, yams and other root crops
Sugar
Oil producing crops
Fiber crops
Annual leguminous forage crops
Biennial and perennial leguminous forage crops
Perennial forage grasses
Miscellaneous crops
; Includes bibliographies
ER  -