BULLETIX 151. TJ. 5. DEPARTVLEXT OF AGRICULTURE. 



YIELDS OBTAINED. 



Table I gives the yields of various crops from the plats cropped 

 biennially, as compared with the yields of the same crops on plats 

 cropped annually, and the average yields of the various crops from 

 all plats planted to each crop in the rotation experiments. The aver- 

 age yields are obtained by considering all of the plats in the rotation 

 experiments and should be fairly representative of results from good 

 farming in that region. 



Table I. — Crop yields from plats cropped biennially, as compared with plats cropped 

 annually and with all plats used for these crops in the rotation experiments. 1 









Biennial 



cropping. 





Average of all rota- 

 tion plats. 





Year and crop. 









Annual 

 cropping. 







Actual. 



Percentage 

 of annual 



Yield. 



Vomber of 

 plats 











cropping. 







averaged. 





1911. 















Corn 



Cotton 

 Oats 



1912. 



bushels., 

 pounds., 

 bushels.. 



3.2 



318.0 



10.1 



59.2 

 71.3 

 160.5 



5.4 



446.0 



6.3 



10.6 



483.0 



8.5 



29 

 25 



11 



Com 



Cotton 

 Oats 



1913. 



bushels. . 

 pounds., 

 bushels.. 



24.7 

 448.0 

 37.0 



92.9 

 94.6 

 181.5 



26.6 

 474.0 

 20.4 



34.1 

 621. 5 

 26.75 



26 

 25 



10 



Corn 



Cotton 

 Oats 



AVERAGE, 1911-1913. 



bushels.. 

 , pounds.. 

 , bushels.. 



30.7 



350.0 

 38.0 



92.8 



53.9 



369.0 



33.1 

 508.0 

 10.3 



34.9 



560.1 

 11.7 



21 

 30 



9 







bushels., 

 pounds., 

 bushels.. 



19.5 



372.0 

 28.4 



89.9 



78.2 



231.0 



21.7 



476.0 



12.3 



26.5 



554.9 

 15.7 









Oats 









i The rotation experiments are conducted on 82 quarter-acre plats. They include continuous cropping, 

 biennial cropping, and 2-year, 3-year, and 4-year rotations, combined with various tillage methods, manur- 

 ing, and green manuring. In general, it would be expected that the average yields in these experiments 

 ■would be larger than those obtained from the continuously cropped plats. 



It is shown in Table I that in no instance has cotton or corn yielded 

 as much on biennially cropped as on annually cropped land. The 

 average yields of cotton and corn on all the rotation plats have been 

 higher than those secured from either biennial cropping or annual 

 cropping, indicating that neither fallowing nor continuous cropping 

 for corn and cotton is to be recommended as a general practice under 

 San Antonio conditions. 



On the other hand, winter oats on land biennially cropped have 

 consistently yielded higher than where planted annually on the 

 same land and higher than the average from all oat plats hi the 

 rotation experiments. 



VEGETATIVE GROWTH OF CROPS ON FALLOWED LAND. 



It has been observed during the past two years that during the 

 greater part of the growing period oats made a less rank growth on 

 the fallowed plat than on the plats in the rotation experiments. 



