Improving the Chemical Nature of the Soil 93 



crops for tests in school gardens. From the usual amount 

 of the various fertilizers applied per acre, we may cal- 

 culate the amounts necessary for the beds.' If they are 

 just one yard square, divide the usual quantities by the 

 number of square yards per acre (4,840), and the quo- 

 tient will indicate the amount required for the beds. 

 It is recommended that a space of two feet be left be- 

 tween the beds to guard against the possibility of the 

 fertilizer in one bed affecting results in adjacent ones. 

 The location should be one not subject to washing or 

 flooding. 



1 33a. Scheme for Field Tests of Different Fertilizers. Beds exactly 

 one yard square. Walks two feet wide. 



1. Land for beds plowed 2. Harrowed, or raked 



3. Beds laid out and staked. . . 4. Fertilizers applied 



5. Beds planted 6. Quantity of seed to each bed. . 



7. Depth planted 8. Plants appeared above ground 



Quantity 



Jiflts, 



square yard 



Nothing (check) .... 



Compost 5-10 2 Ibs. 



Wood ashes 1,000-3,000 * Ib. 



Fresh lime 5,000-20,000 3 Ibs. 



Common salt 1 oz. 



Sodium nitrate 100-300 1 oz. 



Acid phosphate j 200-400 2 oz. 



Nothing (check) 



Potash (Kainit) 100-300 1 oz. 



Combination 



Soluble phosphate 200-400 1 oz. 



Sodium nitrate 200-300 1 oz. 



Nothing (check) 



Combination 



Phosphate 



Potassium nitrate 



Nothing (check) 



