238 Journal of Agricultural Research voi. v, no. 6 



Boxes Nos. Gm, 



5-6. Complete fertilizer+sodium sulphate (Na^vSO^) 12 



7-8. Complete fertilizer+calcium sulphate (CaSO^) 12 



9-10. Sodium sulphate (NaaSOj) 12 



11-12. Calcium sulphate (CaS04) 12 



13-14. Sulphur (flowers) 5 



All of these materials were mixed with the soil at the beginning of the 

 experiments, except the sodium nitrate. This was applied in solution 

 in three separate portions as the plants developed. Sulphur was not 

 included in the treatment of the earlier experiments. These amounts 

 of fertilizer are equivalent to the following applications per acre to the 

 surface 8 inches of soil, assumed to weigh 2,000,000 pounds: Tricalcium 

 phosphate, calcium sulphate, and sodium sulphate, 1,600 pounds each; 

 potassium chlorid, 600 pounds; sodium nitrate, 1,330 pounds; and 

 sulphur, 665 pounds. 



While these applications may appear excessive as compared with 

 field applications, nevertheless it should be remembered that in these 

 experiments there was a thorough and complete mixing with the entire 

 soil mass. In some cases the soil was limed. For this purpose 10 gm. 

 of calcium carbonate were added to each box in the set. This was at the 

 rate of 1,330 pounds per acre of a depth of 8 inches. 



Except in the case of large seeds, such as beans and peas, the seeds 

 were sown liberally in four rows across the boxes and thinned v/hen well 

 developed to 16 plants per box. The larger seeds were germinated on 

 paraffined mosquito netting stretched over distilled water, and transplanted 

 to the soil when well developed. The usual care was taken to support the 

 taller crops and suppress development of fungi and insects, but the use of 

 any sulphur-containing sprays was of course carefully avoided. 



When the crops w^ere mature, they were har\^ested and weighed while 

 fresh. They were then dried quickly in steam-heated trays at about 

 50° C. and allowed to stand exposed to the air from two to three weeks 

 to become air-dried, in which condition they were finally weighed. 



The final comparative weights will be presented in the following tables, 

 in v.-hich the weights given are averages obtained from duplicate .boxes. 

 In some cases, as indicated, the seed has been separated from the straw 

 and weighed separately. Owing to the difficulty in recovering the roots 

 from the soil, they have been neglected in most cases. 



LEGUMINOSAE 



Beans (Phaseolus vulgaris). — The variety of beans grown was Davis 

 White Wax. In crop A only 10 plants were grown per box. This 

 crop followed two successive crops of clover on the same soil, the first 

 ■crop of clover having been fertilized. Crop A was fertilized as usual, 

 except that no sulphur was added to boxes 13 and 14. Crop B was not 

 fertilized. Crop C was completely fertilized. Crop D was grown on a 



