258 ARID AGRICULTURE. 



little higher than the young grain. The spray is 

 most effective if applied when there is a little 

 dew on the plants, but should not be used in 

 rainy weather. The strength of the solution is 

 100 pounds of iron sulphate to 52 gallons of 

 water. Stir to dissolve and strain through 

 cheese-cloth so it will not clog the spray nozzle. 

 This makes enough solution for one acre. Ap- 

 ply with a force spray pump. Where this is 

 used to kill the weeds, it turns some of the grain 

 leaves brown or black and puts back the growth 

 of the grain crop a few days. 



