FIELD CROPS. 



291 



Ou 3 varieties of potatoes identical amounts of potash, supplied 

 either in the form of muriate or high-grade sulphate of potash, were 

 applied in connection Mith a constant quantity of bone. With all S 

 varieties the yield was greater when sulphate of potash was used. 

 Beauty of Hebron yielded more than New Queen or Clark. 



Fertilizer experiments on oats, C A. Goessmann (Massachu- 

 setts State Sta. Ept. 18!Jo, i^p. 1^4-192). — Forty-five pounds of nitrogen 

 per acre in the form of nitrate of soda, of dried blood, or of sulphate 

 01 ammonia was applied in connection with 80 lbs. of phosphoric acid 

 and 125 lbs. of potash per acre to i^lats similarly manured during the 

 preceding 5 years. Two plats received only phosphoric acid and jjotash. 

 The object of the experiment was to ascertain the relative value of the 

 different forms of nitrogen and to learn if the roots and stubble of the 

 leguminous crop, sqja bean, wliicli had occupied the land in the preced- 

 ing year, had notably increased the amount of available nitrogen in the 

 soil. 



The oat plants on the plats to which dried blood was applied were 

 especially dark green in color. The average yield of grain on the 

 eighth-acre plats receiving sulphate of ammonia was 02 lbs,, on those 

 receiving dried blood or stable manure 140'r| lbs., and on those receiving- 

 nitrate of soda llOi lbs. Where sulphate of ammonia was used there 

 was a heavy yield of straw without a corresponding increase in the 

 yield of grain. 



"The total yield of crop on the plats receiving no nitrogen addition, as compared 

 with those receiving a nitrogen supply, was: With oats in 1890, one fifth to one 

 sixth less; with rye in 1891, one fifth to one sixth less; with soja beans in 1892, one 

 third to one fourth less; with oats in 1893, one seventh to one eighth less. 



" From this it will appear that the introduction of a legiiniinous crop into our 

 rotation has somewhat reduced the difference in yield between the plats receiving 

 no nitrogen and those receiving it, yet has not entirely obliterated it." 



The effect on the yield of potatoes of digging a part of the 

 tubers early, A. Leydhecker {Ocsterr. landic. Wocheubl. ; ab.s. in, 

 Braiinschw. landw. Ztg., 62 {189-1), No. 2S, pp. 122, 12S).—M:\y 18, entire 

 tubers were planted 3.2 in. deep at distances of 12 by 18 in. In one 

 part of the field all the tubers on 1 plat were dug September 23, at 

 which time vegetation had ceased. On another plat the largest tubers 

 were dug July 27 and the remainder of the crop September 23. The 

 yields per plat, of which the area is not given, were as follows: 



Effect of fractional harvestinf/ on yield of potatoes. 



