CEOP PRODUCTION ON FALLOW LAND AT SAN ANTONIO. 



rotation and tillage experiment of which they are a part was started. 

 The plats which are continuously cropped are as follows: B5-1, 

 corn; B5-3, cotton; and B5-8, oats. The plats are each 264 feet long 

 and 41.25 feet wide, and they are separated by alleys 4f feet wide. 



TREATMENT OF THE PLATS. 



Figure 1 shows graphically the cropping system practiced on the 

 plats considered in this report, from the time the biennial cropping 

 experiments were started until the close of the year 1913. 



The winter oats were seeded early in November and harvested in 

 May, the corn was planted the latter part of February and harvested 





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Fig. 1.— Diagram showing the cropping system practiced on the plats where biennial cropping has been 

 tested in comparison with continuous cropping at the San Antonio Experiment Farm. 



in July, and the cotton was planted early in April and the harvest 

 completed in October. 



In all cases except plat B5-8 (oats cropped annually) the plats 

 were plowed about 8 inches deep as soon as practicable after the crop 

 was removed . Plat B5-8 was left unplowed until just before planting 

 time. After plowing, the plats were harrowed after the first heavy 

 rain came, to soften the clods. They were then harrowed or disked 

 after each rain of consequence and also whenever it was necessary 

 to keep them clear of weed growth and to maintain a soil mulch. 

 For the most part the spike-tooth harrow was sufficient to maintain 

 an adequate mulch throughout the greater part of the fallow period. 



