EXPERIMENT STATION BULLETINS. 603 



Summary. 



Data are presented to show the effects of additions of KCl, acid phos- 

 phate, hydrated lime, CaSO^, NaCl, NaNOj, Ca^{FO^)„ Ca(H,P0j2 

 and CaCOg to two alkaline and two acid sandy loam soils on the com- 

 position of their water extracts. 1 gm. of each treatment was added to 

 1 kg. of soil, the soil saturated with distilled water and leached with 

 3 1. of water in 500 c.c. portions after standing two days. A second 

 leaching was made after another period of fifteen days. Both extracts 

 were then analyzed. The more prominent results are summarized as 

 follows : 



1. In general the SiOo of the alkaline soils was found to be more 

 soluble than that of the acid soils. Results for the first leachings vary 

 but less SiOo was found in the second leachings from the treatments 

 than in the checks as the rule. 



2. With but two exceptions all the treatments increased the quan- 

 tities of P in all the extracts. 



3. The acid radicals of the salts KCl, CaSO,, NaCl, and NaNO^ 

 appeared in the first extracts in relatively greater quantities than the 

 basic radicals, and their combinations were readily leached from the 

 soils; the second extracts contained only small quantities of these acid 

 radicals. This was not the case with CaCOg and the phosphates. 



4. The basic radicals of the salts KCl, CaSO^, NaCl, and NaNOg 

 occur in the second extracts in considerable quantities but only to a 

 small extent in the chemical combinations added. 



5. More Ca was found in the second extracts than the first in case 

 of the hydrated lime, Ca3(P04)2 (except one instance), Ca(H2P04)o 

 and CaCO, treatments. Excepting one case, more Ca was found in the 

 extracts from the CaCOo treatments than the hydrated lime treatments. 



G. All the treatments excepting Ca3(P04)2 increased the quantities 

 of Mg in the first extracts, as did treatments of hydrated lime, Ca(H2- 

 P04)o and CaCOa in the second extracts. Other Mg results vary con- 

 siderably.- 



7. KCl, Ca(HoP04)2 and CaCOg increased the quantities of Na found 

 in all the extracts. A considerable variation is noted in case of the 

 other treatments. 



8. The general effect of the treatments other than KCl was to depress 

 the quantities of K in the extracts. 



9. Quantities of Fe and Al were markedly increased in the second 

 extracts by the phosphates, CaCOg, NaNOg and CaSO^. Ca(H2P04)2 in- 

 creased the Fe and Al in the first extracts, and Al was also increased 

 in these portions by hydrated lime, NaCl, and CaCOg. 



10. The quantities of fixed CO, were in general reduced in the first 

 extracts, except in case of the hydrated lime and CaCOg treatments, 

 while this component was markedly increased in the second extracts by 

 all treatments. 



