INDEX. 



Page. 



Acids, vegetable, relation to availability of plant food 15 



Alfilaria, use as green manure '. 7 



Alfilerilla, synonym of alfilaria 7 



Aphids, damage to green-manure crops 18 



Army worm. See Worm, army. 



Bean, horse, inoculation in green manuring 14, 35 



nitrogen-gathering status 31 



use as green-manure crop 26, 27, 30-31, 35 



Black bitter vetch. See Vetch, black bitter, 

 purple vetch. See Vetch, black-purple. 



Brome-grasses, use as green manure 7 



Bur clover. See Clover, bur. 



California, orchard districts 8-10 



southern, inoculation with nitrogen-gathering bacteria 31 



summary, green-manm-e crops 34-35 



University, work with green-manure crops 7 



Canada field peas. See Peas, Canada field. 



Chico, Cal., Plant Introduction Garden, tests 7 



results for green-manure crops 21, 22-23, 27, 33 



Citrus orchards. See Orchards, citrus, 

 trees. See Trees, citrus. 



Clover, bur, nitrogen-gathering status I9 



use as green-manure crop 7, 9, 12, 15, 19-20, 26, 27, 32, 34, 35 



Commercial fertilizers. See Fertilizers. 



Cowpea, Whippoorwill, use as green-manure crop 24 



Crops, green manure, conditions of use 10, 11 



nitrogen-gathering status 16, 19, 22, 28, 29, 30, 31, 32 



promising, discussion 27-32 



qualities and methods 10-15 



results of growing 25-27 



summary for California orchards 34-35 



summer, objections and suggestions 24, 35 



turning under 12-13 



winter, use in California orchards 15-24 



Deciduous orchard sections. See Orchards, deciduous. 



Drought, endurance by hairy vetch 24 



Dry weather. See Drought. 

 Erosion. See Soil, erosion. 



Exeter, Cal., center of citrus-fruit area g 



Fenugreek, freedom from insects harmful to orchards 22 



nitrogen-gathering status 22 



seed 22, 23, 33, 34 



use as green-manure crop 15, 20-23, 27, 35 



190 37 



