THE MONTHLY BULLETIN. 



219 



To facilitate spraying, dear water should be used and the iron 

 sulphate should be prepared a sufficient time ahead to insure a thorough 

 mixture. On this experiment a barrel was used for mixing. As soon 

 as the machine was loaded the ban-el was refilled and contents stirred 

 vigorously. Upon returning to reload, the mixture was again stirred 

 and the liquid then poured into the machine lank through a cheesecloth 

 .strainer. 



Other Control Measures. 



Control of mustard bj r means of 

 chemicals is not expected to take 

 the place of the ordinary methods, 

 such a.s crop rotation, cultivated 

 crops, harrowing the growing 

 grain, or hand-pulling weeds 

 where the infestation is not too 

 extensive, lu regard to crop 

 rotation, Professor Bolley, of 

 North Dakota, says: 



"Crop rotation must be con- 

 sidered as an essential of agri- 

 culture for other reasons than 

 destroying weeds, though, if for 

 no other purpose, it would be 

 important to have a proper serial 

 system of cropping. Continuous 

 cereal farming has not been found 

 satisfactory for the elimination of 

 any kind of weed after it once 

 has charge of the ground." 



Too much emphasis can not be 

 Laid on the value of clean seed. 

 The farmer should never sell his 

 best seed and save his worst for 

 planting. The writer again de- 

 sires to quote from Professor 

 Policy. "It is one of the most 

 evident facts of agriculture that 

 the greatest present source of cr 

 inferior agricultural seeds." 



Fig. 4S. — Wild radish, Raphanus sativus L.. 

 another member of the mustard family 

 generally found in the grain fields during 

 the summer. The flowers are either pur- 

 ple, pink or white and slightly larger 

 than those of the common mustard. The 

 leaves are more distinctly lobed than 

 mustard and the pods are strongly con- 

 stricted between the seeds. (Courtesy of 

 "Farm Weeds.") 



op depletion is due to the use of 



WEED CONTROL DEMONSTRATION IN YOLO COUNTY. 



Under the direction of Mr. G. IT. Hecke, State Horticultural Com- 

 missioner, the writer cooperated with Mr. Win. Gould, County Horti- 

 cultural Commissioner of Yolo County, in a spraying experiment for 

 the control of wild mustard. 



The iron sulphate used in the experiment was donated by the Amer- 

 ican Steel and Wire Company's branch office in San Francisco. The 

 free use of a spraying tank was also granted by them, and grateful 

 appreciation for the courtesy is hereby extended. 



