440 



Tw£;nty-eighth Annual Re;port 



The results of these ferti- 

 lizer tests were very hard 

 to measure. On the first 

 four plots such an irregular 

 stand was secured that no 

 records were kept. The 

 records on plots five to 

 eight are of little value 

 because of the many fac- 

 tors affecting the results. 

 There is no definite period 

 of maturity in lettuce. It 

 increases in size for a long 

 time after it might be mar- 

 keted. Practically any of 

 the soil in the Salt River 

 Valley is strong enough to 

 grow large-sized heads if it 

 lias time enough. 



A good method of meas- 

 uring the effects of the fer- 

 tilizer was discovered too 

 late to be used. Weighing 

 a certain number of the 

 most mature heads from 

 each plot at regular inter- 

 vals, would have given a 

 comparison of yield as well 

 as earliness. 



The only conclusions 

 that can be drawn from the 

 fertilized plots are that the 

 ])lot receiving the manure 

 at the rate of 20 tons to the 

 acre was the first to come 

 to maturity and produced 

 the best lettuce. The ma- 

 nure put some sour clover 

 seed in the ground, but af- 

 ter the thinning no trouble 

 was experienced from this. 



