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John Andreas Widtsoe. Dry-Farming : A System of Agriculture for Countries under a Low Rainfall
Dry-Farming : A System of Agriculture for Countries under a Low Rainfall
Table of Contents
TO
LEAH. THIS BOOK IS INSCRIBED. JUNE 1, 1910. PREFACE
JOHN A. WIDTSOE
CHAPTER I
INTRODUCTION. DRY-FARMING DEFINED
CHAPTER II
THE THEORETICAL BASIS OF DRY-FARMING
CHAPTER III
DRY-FARM AREAS—RAINFALL
GRAND TOTAL 1,861,652
CHAPTER IV
DRY-FARM AREAS.—GENERAL CLIMATIC FEATURES
CHAPTER V
DRY-FARM SOILS
CHAPTER VI
THE ROOT SYSTEMS OF PLANTS
CHAPTER VII
STORING WATER IN THE SOIL
CHAPTER VIII
REGULATING THE EVAPORATION
CHAPTER IX
REGULATING THE TRANSPIRATION
CHAPTER X
PLOWING AND FALLOWING
CHAPTER XI
SOWING AND HARVESTING
CHAPTER XII
CROPS FOR DRY-FARMING
THE SORGHUMS
CHAPTER XIII
THE COMPOSITION OF DRY-FARM CROPS
CHAPER XIV. MAINTAINING THE SOIL FERTILITY
CHAPTER XV
IMPLEMENTS FOR DRY-FARMING
CHAPTER XVI
IRRIGATION AND DRY-FARMING
CHAPTER XVII
THE HISTORY OF DRY-FARMING
CHAPTER XX
DRY-FARMING IN A NUTSHELL
CHAPTER XIX
THE YEAR OF DROUTH
RECORD OF INDIAN HEAD EXPERIMENTAL FARM AND MOTHERWELL'S FARM, SASKATCHEWAN, CANADA
CHAPTER XVIII
THE PRESENT STATUS OF DRY-FARMING
Отрывок из книги
John Andreas Widtsoe
Published by Good Press, 2021
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Nearly one half of the United States receives 20 inches or less rainfall annually; and that when the strip receiving between 20 and 30 inches is added, the whole area directly subject to reclamation by irrigation or dry-farming is considerably more than one half (63 per cent) of the whole area of the United States.
Eighteen states are included in this area of low rainfall. The areas of these, as given by the Census of 1900, grouped according to the annual precipitation received, are shown below:—
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