CROP PRODUCTION ON FALLOW LAND AT SAN ANTONIO. 7 
plats of corn (fig. 2) and cotton (fig. 3) was generally highest in the 
spring at about planting time for these crops; that there was a gen- 
eral decline in the moisture content of the cropped plats until har- 
vest and also a slight decline in the moisture content of fallowed 
plats; and that there was only a slight difference in the moisture 
content of the fallowed and continuously cropped plats at either 
planting or harvest time, the tendency being for the curves to coin- 
cide at these periods. 
The moisture content of the oat plats (fig. 4) was generally highest 
during the months of January and February and lowest in June, at 
about harvest time. At planting time for oats in the autumns of 
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PLATANS. 
Fig. 4.— Diagram showing the average moisture content of the soil on plat B5-8, which was cropped 
annually to oats, and on plats A4-5 and A4-6, which were cropped biennially to oats, at the San 
Antonio Experiment Farm, January, 1910, to October, 1913. On each sampling date all the plats 
were sampled to a uniform depth, in most cases 6 feet, but in some instances 3 feet. 
1910 and 1912 the moisture content of the fallowed plat was somewhat 
higher than that of the continuously cropped plat, and in 1911 it was 
nearly the same. At harvest time in 1911 and also in 1912 the 
moisture content of the fallowed plat was somewhat lower than that 
of the continuously cropped plat, and in 1913 the moisture content 
of both plats was about the same. 
It appears from this that fallowing resulted in a higher moisture 
content in the fall at planting time for oats, and that when the land 
remained fallow until time for planting corn and cotton, fallowing 
did not store any appreciable quantity of moisture in the soil in 
excess of that stored in land continuously cropped, plowed in the 
fall, and left fallow during the winter. 
