FERTILIZERS. 45 



MISCELLANEOUS PROBLEMS. 



1. How much nitrogen, phosphoric acid and potash would be 

 removed from an acre of land yielding 20 bushels of wheat and 2,000 

 pounds of straw? 



2. How much nitrate of soda 18%, acid phosphate 14% and muriate 

 of potash 50% would be required to replace the plant foods removed 

 by the crop in No. 1. 



3. At current prices for nitrate of soda, acid phospihate and mu- 

 riate of potash what would be the value of the nitrogen, phosphoric acid 

 and potash removed by the crop in first problem? 



4. An animal receives a daily ration of 12 pounds clover hay, 5 

 pounds cornmeal-, 3 pounds bran, 30 pounds corn silage. If 65 per cent 

 of the nitrogen, phosphoric acid and . potash respectively is recovered 

 in the manure how many pounds of each would be produced in 30 days? 



5. If the animal produces 50 pounds of manure per day, what per 

 cent of nitrogen, phosphoric acid and potash would this manure contain, 

 using the solution of No. 4 as a basis of calculation? 



6. Given nitrate of soda (18% ammonia) acid phosphate (14% 

 phosphoric acid) and muriate of potash (50% actual potash), how many 

 pounds of each would be required to make one ton of mixed fertilizer 

 containing 2.85% ammonia, 10.5% phosphoric acid and 5% potash? 



7. To the materials given in No. 6 add steamed bone meal (2% 

 ammonia, and 28% phosphoric acid) and calculate the amount of bone 

 meal required for one ton of fertilizer containing 4.03% ammonia, 16.1% 

 phosphoric acid and 4% potash. 



Exercises. 



1. Get samples of the different fertilizer materials, manures, peat 

 soils, lime, different kinds of bacteria cultures, scales for weighing, and 

 seeds of different varieties of staple crops of your locality. 



2. A small area of ground may be laid out or plotted into plots 

 of any size convenient for making demonstrations' or experiments. Where 

 there is no land available, use may be made of pots (but there will be 

 more or less difficulty about the proper distribution of moisture and in 

 thus obtaining natural conditions. 



The plots may be one-tenth, one-twentieth, one-fortieth, one-eigh- 

 tieth of an acre or the plots may be on the basis of a square rod or 

 the fraction of a square rod. 



3. Write to your state experiment station for instructions in trying 

 out a series of experiments. The station will tell you what is the best 

 method and most practical experiment to make in your locality. The 

 station will advise and probably co-operate with you. 



4. In all experiments an accurate record should be kept of all ex- 

 penditures based on the cost of fertilizers, seed, labor and value of 

 crop per acre. 



