CONTENTS 



Page. 



Introduction 7 



The orchard districts of California 8 



Southern citrus section 8 



Northern citrus section 9 



Deciduous orchard sections ' 9 



Conditions under which green-manure crops should not be used 10 



Qualities desirable in a green-manure crop 10 



Methods of handling green-manure crops 11 



Preparation of the land 11 



Seeding 12 



Irrigation 12 



Turning under a green-manure crop 12 



Inoculation 14 



Commercial fertilizers 15 



Winter green-manure crops now used in California orchards 15 



Common vetch 15 



Canada field peas 17 



Bur clover 19 



Fenugreek 20 



Adaptation 21 



Comparative value 21 



Planting 22 



Seed production 23 



Hairy vetch 23 



Indian melilot 24 



Summer green-manure crops 24 



Results of green manuring in California 25 



Results of tests with various legumes 25 



Promising green-manure crops 27 



Black-purple vetch 28 



Black bitter vetch 29 



Woolly-podded vetch 30 



Horse bean 30 



Tangier pea 32 



Cost of seed of green-manure crops 32 



Summary 34 



Index 37 



190 5 



