4 CIRCULAR 926, U. S. DEPARTMENT OF AGRICULTURE 





Figure 2. — Disking to incorporate the insecticide with the soil. 



Cultural Practices 



The soil was prepared for planting in the usual manner. In 1950 

 an ammonium nitrate fertilizer (32.5 percent nitrogen) was ap- 

 plied over the entire site at the rate of 260 pounds per acre and 

 disked in. In 1951 an ammonium phosphate fertilizer (16 percent 

 nitrogen, 20 percent phosphorus) was applied at the same rate. 

 No fertilizer was applied before the 1949 crop was planted. 



Table 1. — Rainfall (in inches) at Ventura, Calif., about 8 miles 

 from the experimental plots 



Month 



January 



February 



March_ 



April 



May 



June 



Julv 



August 



September. 



October 



November. 

 December . 



1949 



Total. 



1.56 

 1.39 

 1.38 

 



0.87 

 .18 

 

 

 

 



1.00 

 3.93 



10.31 



1950 



.10 

 .20 





 .17 

 .41 



1.52 

 .22 



10.0 



1951 



17-year average 



2.16 



2.34 



0.06 



1.72 















.01 







.83 

 1.56 

 5.06 



13.74 



2.74 



3.45 



3.07 



1.04 



0.08 



.08 







.04 



.09 



.65 



.80 



3.35 



15.39 



