Factors of importance which influence the determination of the amount 

 of ascorbic acid in frozen and stored strawberries were found as follows: 

 (1) the presence of a high sugar content. (2) changes due to hydrolysis of 

 carbohydrates during storage, and (3) presence of varying amounts of 

 dicarboxylic acids as noted by changes in total titratable acids and pH. 

 These factors must be taken into account when analyzing for the ascorbic 

 acid content of foods commonly accepted as rich sources of this vitamin. 



S. R. Shimer 



Work With Lime and Chelated Compounds 

 on a Paxton Soil in the Greenhouse 



Oat plants were grown in pots in the greenhouse at two levels of soil 

 fertility and with variable amounts of lime. Chelated compounds were added 

 to the pots with the low level fertility soil. These pots had received the 

 equivalent of 3/2 ton of fertilizer and 2 tons of lime per acre. At both the 

 higher and lower levels of fertilizer, significant decreases at the 1 percent 

 level occurred where the two tons of lime equivalent had been applied. None 

 of the chelated compounds gave significant yield differences at the 1 percent 

 level, but applications of zinc and copper together gave significant increases 

 at the 5 percent level. 



In a later test, corn was grown in the same soil and pots after the soil 

 was refertilized to the low and high fertility levels. There was an increase 

 in corn yields with the addition of lime up to 1 ^ ton equivalent in the low 

 fertility soil and up to 1 ton of lime in the high fertility soil. Additions of 

 lime in both cases beyond these amounts decreased yields. With equivalent 

 lime applications, there was a decrease in pH with higher fertilizer ap- 

 plications. 



Effect of Fertilizer Soil Application on pH 



Equivalent 1000 lbs. 



of 5-10-10 per acre 5.19 5.90 6.39 



Equivalent 2000 lbs. 



of 5-10-10 per acre 5.04 5.65 6.16 



G. P. Percival 



Lasting Effect of an Application of Lime 

 and Cobalt to a Gloucester Soil 



The pH values of soil samples taken at 2 inch levels from plots on 

 Gloucester soil showed that 5 years after application the effect of the 1 ton 

 of lime had penetrated 4 inches and that of the 3 ton application, 6 inches. 



When an additional 50 pounds of nitrogen from nitrate of soda was 

 applied annually to the lime plots over and above the annual basic addition 

 of 15 pounds of nitrogen, the pH values increased at the upper levels as well 

 as at a greater depth. 



Analyses of the forage samples taken from these same plots show that 

 while both 2 pound and 5 pound applications of cobalt were effective in in- 



