of water. Then 10 c. c. of the stock solution added to 1 kilo of soil, 

 or 18 c. c. added to 4 pounds, represents 100 parts per million or 200 

 pounds per acre. Quicklime is slaked and added usually at the rate 

 of 1.8 grams to 4 pounds of soil or 1 ton per acre. Manure, if used in 

 the dry form, is usually added at the rate of 9 grams to 4 pounds or 5 

 tons per acre. 



The following table shows the treatments commonly used in the 

 greenhouse work, but these are often varied to suit conditions: 







1. Untreated. 



2. Dry manure, 5 tons per acre. 



3. Lime, 1 ton per acre. 



4. Nitrate of soda, 200 pounds per acre. 



5. Sulphate of potash, 200 pounds per acre. 



6. Acid phosphate, 200 pounds per acre. 



7. Nitrate of soda and sulphate of potash, 200 pounds each per acre. 



8. Nitrate of soda and acid phosphate, 200 pounds each per acre. 



9. Sulphate of potash and acid phosphate, 200 pounds each per acre. 



10. Nitrate of soda, sulphate of potash, and acid phosphate, 200 pounds each per acre. 



11. Nitrate of soda, sulphate of potash, and acid phosphate, 200 pounds each per acre 



-f lime, 2,000 pounds per acre. 



12. Cowpeas, 5,000 pounds per acre + lime, 2,000 pounds per acre. 



After the fertilizers have been added to the soil it is allowed to 

 remain in the pans for several days, being moistened with distilled 

 water occasionally, and frequently stirred so that the fertilizers may 

 become thoroughly distributed. At the end of this time the soil in 

 each pan is moistened again with distilled water, which is added until 

 the optimum condition, or most favorable moisture content for plant 

 growth, is reached. This varies with different soils, but with a little 

 experience the operator can judge it quite accurately. The soil in 

 each pan is then divided into five nearly equal parts, and each part is 

 placed in a wire basket, care being taken to press the soil well into the 

 bottom and sides of the basket, which should be filled to within about 

 one-half inch of the top. After being filled, the soil which projects 

 through the meshes of the wire is carefully brushed off and the bas- 

 kets are ready for planting. 



One or two days before the time for planting, a sufficient quantity of 

 wheat for the purpose is placed between moist cloths, covered with 

 wet sand, and placed in a favorable place for germination. From 

 these sprouted wheat grains those of uniform size and about the same 

 stage of development are selected, six being planted in a row and to 

 the same depth in each basket. The surface of the soil is then cov- 

 ered to a depth of about one-fourth inch with clean dry sand and the 

 pots dipped bottom down into hot paraffin until an impervious layer 

 is formed over the lower part of the basket connecting with the rim 

 around the top. In coating the basket the paraffin is kept at an even 

 temperature and the basket dipped and quickly removed to allow 



