) 
EF. A. CARLSON 
oP 
( 
The following chemical composition was determined by 
Lyon and Bizzell from representative samples: 
First Second 
Constituents determined foot foot 
(per cent) (per cent) 
NItLOoeenetON) ee Gee i eee rea RE 0.134 0.062 
Organievcarbon (CC) ees ie ices eee 1.190 0.300 
Galeiumeoxdde (CaO) ee ce eee 0.340 0.280 
Masmesiummoxid ei (MeO) nine exe es ee eee 0.350 0.450 
PotassiumeoxidesGKe Oi ee ae ee eee 1.830 2.360 
Sodium joxide@Nae ©): (eee ieee ess ees eee ea tee 0.860 0.860 
Phosphoricsanhydride | GRsOl). a. sey ee eee 0.084 0.079 
Sulfur: strioxdew(S OR) eee eee ie ear eae ae 0.084 0.053 
Carbon dioxide 7CCO Ne ke ee eee LSE Na cee 0.030 0.020 
Lime requirement* (CaO) in parts per million...... 1,222 1,285 
Lime requirement (CaO) in pounds per acre foot; ..4,454 4,918 
* The Veitch method was used for the determination of lime requirement. 
7+ Calculated from weight of soil as 3,645,000 pounds of dry soil per acre foot 
in the first foot of soil, and 3.827.500 pounds in the second foot. 
SOIL SAMPLING 
The plats in Series I were sampled both before and after 
the ten-years period. Soil samples were taken from each plat 
to a depth of four feet, each foot being kept separate. Six 
borings:were made on each plat. The borings for the same foot 
were carefully mixed together and a 2-quart sample of each foot 
of each plat was retained. The soil samples were air-dried and 
placed in tightly sealed jars. 
The plats in Series Il were sampled before and after the 
eight-years period according to the following method: Each 
plat was divided into three parts—N (north), M (middle), and 
S (south). Hach one of these sections was sampled as outlined 
for the plats in Series I. 
Preparation of the sample 
The air-dried soil was brought to a uniform condition by 
breaking up the soil lumps and carefully mixing. A composite 
sample was taken and was placed in a 1-millimeter sieve. All 
particles of the soil that did not pass through the 1-millimeter 
perforations were discarded. A composite sample was taken 
