154 



Appendix. 



Ammonite (azotine) 



Castor bean pomice 



Cotton-seed meal 



Dried blood, high-grade- 

 Dried blood, low-grade. _ 



Guano 



Dried fish 



Horn and hoof waste 



Leather scraps and meal 



Meat scraps 



Nitrate of potash 



Nitrate of soda 



Oleomargarine refuse 



Sulphate of ammonia.— 



Tankage 



Tobacco stems 



Wool waste (untreated). 



Average 

 per cent 

 Nitrogen 



10 to 



5 to 



6 to 

 12 to 



(j to 

 (i to 



7 to 

 10 to 



7 to 

 10 to 



18 to 

 15 to 

 10 to 



19 to 

 6 to 

 2 to 

 5 to 



14 



(i 



7 



15 



12 



8 



8 



15 



10 



13 



14 



16 



12 



20 



12 



3 



6 



Pounds of 



Nit.roge7) in 



one ton of 



material 



200 to 280 

 100 to 120 

 120 to 140 

 240 to 300 

 120 to 240 

 120 to KiO 

 140 to KiO 

 200 to 300 

 140 to 200 

 200 to 260 

 2(i0 to 2S0 

 300 to 320 

 200 to 240 

 380 to 400 

 120 to 210 

 40 to 60 

 100 to 120 



Becomes 

 available 



Quickly 

 Moderately fast 

 Moderately fast 

 Quickly 



Gradually 



Quickly 



Hlowly 



Very slowly 



Quickly 



Immediately 



Immediately 



Gradually 



Very quickly 



Quickly 



Gradually 



Very slowly 



Ammonite, Azotine as it is sometimes called. Dried Blood, Horn and Hoof 

 Waste, Leather and Meat ^crap. Oleomargarine licfuse. Tankage and Wool Waste 

 are all by-products coming from packing houses and rendering establishments. 



Castor Bean Pomace is the residue left after separating castor oil from the 

 bean. 



Cotton-Seed Meal is the dried residue left after separating the oil from 

 the cotton seed. 



Dried Fish is the dried and ground refuse from iish-oil works. 



Guano is a rich nitrogenous manure obtained from rainless regions. The 

 supply is nearly exhausted. 



\itrate of Soda (Chili saltpeter) is a mineral substance obtained along 

 the western coast of South America. The world's supply of nitrate of soda 

 comes from this region. 



Potassium yitrate or true saltpeter comes largely from India. This material 

 is so valuable that little or none of it is used as fertilizer. 



Tobacco Stems, as the name indicates, is refuse and waste material from 

 tobacco and cigar factories. 



Sulphate of Ammonia is a by-product obtained during the manufacture of 

 illuminating gas and coke, also during the manufacture of bone-black. 



PHOSrHORIC ACID SUPPLY. 



Phosphoric acid in the agricultural sense may be classed as soluble, re- 

 verted and insoluble also as available, not available and total. 



Soiuhle rhosphoric Acid is often called mono-calcium phosphate, acid phos- 

 phate, or superphosphate. These are all readily soluble in water and easily 

 available for plant growth. 



Reverted Phosphoric Acid, also called citrate-soluble phosphoric acid, in- 

 cludes that phosphoric acid which is not soluble in water but which is soluble 

 in ammonium citrate solution. It is called reverted because at one time it was 

 water-soluble but has since changed back or reverted into an insoluble form. 

 Reverted phosphoric acid is often called di-cnlcium phosphate. This form of 

 phosphoric acid even though insoluble in water is still easily available for 

 plant growth. 



There is found in Thomas slag a form of phosphoric acid known as tetra- 

 calcium phosphate. This, in many respects, is similar to ordinary reverted or di- 

 calcium phosphate. It is insoluble in water, but much more easily soluble than 

 tri-calcium phosphate and is largely available for plant growth. 



