6 



BULLETIN 151, U. S. DEPAETMENT OF AGRICULTURE. 



Moisture determinations have been made on each oi the plats at 

 planting time and just before or just after harvest, to determine the 



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Fig. 2. — Diagram showing the average moisture content of the soil on plat B5-1, which was cropped 

 annually to corn, and on plats A4-3 and A 4-4, which were cropped biennially to corn, 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. 



amount of moisture present at planting time and the amount of 

 stored moisture used from each plat. 



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Fig. 3.— Diagram showing the average moisture content of the soil on plat B5-3, which was cropped 

 annually to cotton, and on plats A4-1 and A4-2, which were cropped biennially to cotton, 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. 



By observing carefully the curves showing the moisture content 

 in the various plats it will be seen that the moisture content of the 



