1904.] PUBLIC DOCUMENT — No. 33. 123 



obtained with equal manure and fertilizers. Up to the pres- 

 ent time it is not considered to have furnished sucli a basis, 

 and no reference accordingly will be made in this report to 

 the yields upon this plot. 



All the prominent out-door garden crops in this locality 

 have been gi-own in rotation u})on each plot, and each crop 

 during several years. The list of crops so far grown includes 

 spinach, lettuce, onions, garden peas, table beets, early and 

 late cabbages, potatoes, tomatoes, squashes, cucumbers, tur- 

 nips, sweet corn, celery, and one small fruit, — strawberries. 

 Asparagus and rhubarb were set in 1902, but no cuttings 

 have yet been made, and these will not therefore be referred 

 to in this report. 



As stated in my last annual report, these "experiments 

 have been planned with reference to tlirowing light espe- 

 cially upon two points : A. The relative value of nitrate of 

 soda, sulfate of ammonia and dried blood used as sources 

 of nitrogen. B. The relative value of sulfate of potash 

 and muriate of potash. These two points will be separately 

 discussed." 



A. — The Relative Value of Nitrate of Soda, Sulfate of Am- 

 monia and Dried Blood as Sources of Nitrogen. 

 The three fertilizers compared as sources of nitrogen have 

 from tiie first been applied in such amounts as to furnish 

 equal nitrogen to each plot (at the rate of 60 pounds per 

 acre) , and each fertilizer is always applied to the same plot. 

 An application supplying per acre the amount of nitrogen 

 above named requires the annual application of materials at 

 about the following rates per acre : — 



Pounds. 

 Nitrate of soda, ........ 375 



Sulfate of ammonia, ....... 300 



Dried blood, 850 



Each of these nitrogen fertilizers is used on two plots, on 

 one with sulfate of potash, on the other with muriate, — in 

 both cases in such quantities as to furnish equal actual potash. 



The results with some of the crops, especially where sul- 

 fate of ammonia is the source of nitrogen, have been widely 



