CROP PRODUCTION ON FALLOW LAND AT SAN ANTONIO. 



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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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. 



