242 MASS. EXPERIMENT STATION BULLETIN 194. 



Table V. — Effect of applying Nitrate of Soda at Different Seasons in 

 Connection with Fertilizers supplying Phosphoric Acid and Potash 

 (Pounds) . 



Low Application of Nitrate of Soda. 



Medium Application of Nitrate of Soda. 



Spring, . 



Summer, 



Half in spring, half 

 in summer. 



278.6 

 277.4 

 265.8 



High Application of Nitrate of Soda. 



The inferiority of this corner of the field is cleariy indicated by com- 

 paring the annual yields of plot 40 with those of plot 1, which was fertilized 

 exactly like it. In the years of no rust plot 1 produced much larger 

 yields than plot 40. 



In the comparison of the different forms of potash materials used in 

 fertilizing the asparagus plots 17. to 20, Table II, the first impression 

 would be that muriate was much superior to other forms, and that sulfate 

 was no better than none. A more careful comparison will reveal a close 

 agreement in yields between wood ashes on plot 17, kainit on plot 20, 

 and muriate on plots 34, 35 and 36, all of which received equal amounts 

 of nitrate of soda and acid phosphate. The low yields on plots 18 and 19 

 were possibly due in part to the pro.ximity of a large oak. The tree was 

 nearer plots 18 and 19 than to any others, but was far enough not to shade 

 the plots until nearly sunset. The extent of its roots in the gravelly 

 subsoil may have been greater than was supposed. 



It has been stated that the effects of rust were limited to one-half of 

 the field or less, and that there was a nearly full recovery from the attack 

 as the years passed. This is clearly shown by percentages of losses and 

 gains in yields in Table VI. The first and fourth columns show the 

 losses and gains in yields in 1911 compared with the yields in 1910. It will 



