INDEX. ' 39 



Page. 

 "Plow sole." See Roots, deeply penetrating. 



Plow, use in turning under green-manure crops 11,12 



Pomona, Cal., fenugreek, comparative tests 21 



Porterville, Cal., relation to southern citrus district 8 



Rainfall, California orchard districts, relation to green manuring 8-9, 10, 17 



Rainy season. See Rainfall. 



Redlands, Cal., plantings for green manure 17, 21 



Roots, deeply penetrating, remedy for "jjlow sole" 17, 31 



orchard tree, danger of disturbance in green-manure plowing 12 



Sacramento Valley, area in northern California citrus district ' 8 



San Joaquin Valley, relation to California citrus districts 8 



Santa Clara Valley, irrigation for green-manure crops 12 



Paula, Cal., fenugreek, comparative tests 22 



Seed, cost for green-manure crops 32-34 



green-manure crops, production 23, 32-34 



Seeding, bur clover, time and rate 19 



fenugreek, time and rate 22, 23 



field peas, time and rate 18-19 



methods in California 12, 32 



recommendations 34 



Tangier pea, time and rate 32 



vetch, time and rate 17, 29, 30 



Sierra Madre Mountains, relation to California citrus districts 8 



Soil, California, lack of humus 34 



orchard districts 8-9 



erosion, prevention by green manuring 25 



fenugreek 23 



heavy, unfavorable to green manuring 10 



improvement by green manuring 25 



sandy, for Indian melilot 24 



Southern citrus section. See Orchards, citrus. 

 Spring vetch. See Vetch, common. 

 Stable manure. See Manure, stable. 



Summary, green-manure crops 34-35 



Summer green manure. See Crops, green manure. 

 Tangier pea. See Pea, Tangier. 



Trampling, relation to green manuring 11, 17, 19, 29, 30 



Trees, citrus, cultivation, need, and effect of cessation 10 



Trigonella foenum-graecum. See Fenugreek. 



Turning under, time for green-manure crops 34 



Vegetable acids. See Acids, vegetable. 



Ventura County, Cal., fenugreek as green-manure crop 21, 23 



Vetch, black bitter, nitrogen-gathering status 29 



use as green-manure crop 26-27, 29-30, 33, 34, 35 



purple, nitrogen-gathering status 28 



use as green-manure crop 26-27, 28-29, 33, 35 



common, nitrogen-gathering status 16 



use as green-manure crop 12, 15-17, 22, 26-27, 34, 35 



hairy, use as green-manure crop 15, 23-24, 26-27, 35 



spring. See Vetch, common. 



woolly-podded, nitrogen-gathering status 30 



use as green-manure crop 26-27, 30, 33, 35 



190 



