PLATE LXXXIII 
Cotton seedlings, showing the effect of green manures on their growth: 
Fig. i.— A, B, Control; C, D, i per cent of chopped green oats added to the soil; 
E t F, i per cent of chopped green clover added to the soil. 
Fig. 2.—Effect of planting immediately after plowing under green manure: A, B, 
Control; C, D, 0.25 per cent of green manure added to the soil; E, F, 0.5 per cent of 
green manure added to the soil; G, H, 1 per cent of green manure added to the soil; 
I, J* 2 per cent of green manure added to the soil. 
Fig. 3.—Effect of planting 2 weeks after plowing under green manure. A, B, 
Control; C,D f 0.25 per cent of green manure added to the soil; E, F, o. 5 per cent of green 
manure added to the soil; G, H, 1 per cent of green manure added to the soil; J, J, 2 
per cent of green manure added to the soil. 
Fig. 4.—Effect of the depth of green manure on germination: A, Green manure 
placed in the bottom of the pot; B, green manure placed at the top of the pot; C, 
green manure placed in about the middle of the pot. 
Fig. 5.—Effect of sterilized and unsterilized oats used as a green manure: A, Con¬ 
trol; B, 1.5 per cent of oats added and the mixture sterilized; C, 1.5 per cent of oats 
added without sterilization; D, 3 per cent of oats added and the mixture sterilized; 
E t 3 per cent of oats added without sterilization. 
Fig. 6.—Effect of Rhizoctonia sp. on germination in the presence of green manure: 
A, B t Control; C, D f sterilized soil treated with green manure; E, F, sterilized soil 
inoculated with Rhizoctonia sp. from potatoes; G, H t sterilized soil treated with 
green manure and inoculated with Rhizoctonia sp. from alfalfa. 
