ExfERiMiCNTAiv Work in Dry-Farming 



613 



the planting was delayed until July 17 because of the lateness of 

 the summer rainy season. 



To destroy the grasshoppers which infested the field, a poi- 

 soned bran mash* was scattered broadcast before the beans came 

 1']). The result was quite thorough destruction of the insects, but 

 other grasshoppers came in from the outside and did considerable 

 damage to the crop. 



The highest yield in 1915 was obtained from two plots of 

 teparies which produced 720 and 784 pounds of beans per acre re- 

 spectively. Of the larger varieties Red Hopi again led with a yield 

 of 704 pounds per acre. Casa Grande came next with 528 pounds 

 per acre, and White Hopi and Lady Washington were in third place 

 v.ith a yield of 484 pounds per acre, each. Hopi lima beans did not 

 mature because of the short growing season remaining after sum- 

 mer rains began. The vines grew well and were heavily loaded 

 with green pods when frost came. 



TAxil^K LXX. brans; time of planting TI5ST, SULPHUR SPRING 



VALLEY DRY-FARM, 1915 



1 — Destroyed by grasshoppers. 



Trammell beans were used in a test to determine the most fa- 

 vorable date of planting. Plots were seeded April 20, May 10, June 

 15, and July 15. See Table LXX. The planting of May 10 gave 

 the best returns, yielding 132 pounds of beans per acre. The July 

 15 plot was destroyed by grasshoppers. Data obtained in this test 

 are insufficient to be considered as an absolute indicator of the 

 best time for planting. 



To determine the optimum rate of seeding, six plots of Dwarf 

 Valentine and White teparies were planted at rates varying from 

 four to fourteen pounds per acre. See Table LXXI. The teparies 



*The poisoned bran mash was made according to the following formula: 



Paris green 1 pound Water 2/2 f 



Bran 25 pounds 



Corn syrup 1 Q'^'art Lemons i 



