54 



INDEX 



phosphates, 74; form to use, 78; 

 kind to use, 89; mineral, iz; or- 

 ganic, 70; South Carolina phos- 

 phates, TZ ; Tennessee phosphates, 



74- 



Phosphoric acid, 80; amount in soils, 

 88; available, 84; difference be- 

 tween phosphates and superphos- 

 phates, 83 ; difference of the 

 forms of in superphosphates, 85 ; 

 fixation of, 88; functions of, 89; 

 insoluble, 81; loss of, 28; re- 

 verted, 82; soluble, 81; value of 

 reverted, 83. 



Phosphorus, 4; amount for crops, 

 143- 



Physiological water, 6. 



Plant food, amount available in soils, 

 15; amount removed by crops, 

 14. 



Plants, acids and bases in, 9 : 

 amounts of water used by, 7 : 

 ash of young and mature, 12 ; 

 ash in, 10, 11. 12; composition 

 of, 6; distribution of ash in, 12: 

 dry matter of, 8; elements that 

 make up, 10; food of, 6; how 

 benefited by open soils, 19 ; how 

 they feed, 5 ; must have room, 

 20; occurrence of mineral ele- 

 ments in, 12 ; require oxygen, 

 20; salts in, 10; variation of ash 

 in, 10; variation of water in, 7; 

 water in young and mature, 8: 



Potash, in soils. 94 ; chloride of. 91 ; 

 effects maturity. 96; effects the 

 leaves, 96; favors seed and straw 

 formation, 96 ; fixation of, 95 ; 

 forms of, 95 ; from organic 

 sources, 93 ; functions of, 96 ; 

 helps to neutralize plant acids, 

 97 ; loss of, 28 ; sometimes checks 

 insect pests and plant diseases, 

 97; sulphate of, 91. 



Potash fertilizers, chapter on, 90. 



Potash-magnesia carbonate, 93. 



Potash manure salts, 92. 



Potash salts, 90. 



Potassium, 3 ; amounts for crops, 143. 



Potassium nitrate, 102. 



Powder waste, 102. 



Preservatives for farm manures, 44. 



Pulverized manures, 100. 



Quick-lime, 104. 



Rice hull ashes, loi. 



Rock phosphates, 77. 



Rodunda phosphate, 75. 



Rotations, advantages of, 30; con- 

 serves moisture, 34 ; furnishes a 

 regular income, 32 ; furnishes 

 feed for live-stock, z^ ; helps 

 check insect and plant diseases, 

 31 ; helps distribute farm labor, 

 31; keeps down weeds, 30; leg- 

 umes profitable in, 31 ; prevents 

 losses of fertility. ZZ '• regulates 

 humus supply, 34 ; saves ferti- 

 lizer expenditure, 34; utilization 

 of deep and shallow rooted 

 plants, 33 : utilizes plant food 

 more evenly, 33. 



Salt, common, 102. 



Salts in plants, 10. 



Sawdust and shavings for bedding, 

 36 ; absorptive power of sawdust, 

 37- 



Scutch, 61. 



Seaweed, 99. 



Sewage. 100. 



Sewage sludge. 100. 



Sheep manure. 38 '■ analysis of, 39. 



Shoddies, etc., 62. 



Shrimp waste, 100. 



Silicate of potash, 102.' 



Silicon, 4. 



Slaked lime, T04. 



Sodium, 5 I chloride of, 102 ; sulphate 

 of, 102. 



Soil fertility, chapter on, 13; factors 

 influencing. 13: loss by one crop 



