734 



EXPERIMENT STATION" RECORD. 

 Results with fertilizers in the -'rVcar rotation. 



[Vol. 40 



Plats grown to barley In 1917, after receiving various treatments in 1010 in 

 an effort to eradicate quack grass, produced not returns ranging from S2 per 

 acre where buckwheat was plowed under in full bloom, reseeded, and plowed 

 under after frost, to $84 after bemp. One plat seeded to winter rye after 

 millet gave a net return of $38. -»\ 



Average yields of rutabagas, stock carrots, sugar beets, and mangels 

 amounted to 259.8 bu., 142.5 bu., ft tons, and 13.4 tons per acre, respectively. 



Early Ohio potatoes were first in yield of the early sons, followed by Irish 

 Cobbler and Triumph. Whole Beed treated with formalin gave the highest 

 yield, 154 bu. per aero, in a test of different treatments for the control of tuber 

 diseases, although 65 per cent of the tubers were scab specked and 1..". per 

 cent were unmarketable because of scab and black scurf. Beed treated with 

 corrosive sublimate produced 128 bu. per acre and exhibited only traces of 

 scab and black scurf. A 5:5:50 Bordeaux mixture used twice produced 101 

 bu., as compared with Si) bu. for the check. Bordeaux mixture applied 3 times 

 in comparison with self-boiled lime sulphur and commercial lime-SUlphur re- 

 sulted in yields of 117.1, 110.1, and 106.6 bu. per acre, respectively, as com- 

 pared with 100.3 bu. for the check. Paris green applied both as a liquid and 

 as a dust spray proved most effective against potato beetle, while homemade 

 arsenate of lead was the most economical spray used. 



Seeding Early Ohio potatoes at the rate of 18 bu. per acre resulted in a 

 yield of 184 bu., as compared with 203.5 bu. from a 10 bu. rate. 



In fertilizer tests with potatoes the bighesl average yield for a 4-year 

 period, 142.0 bu. per acre, was secured from plats receiving potassium sulphate 

 and acid phosphate, as compared with 128.1 bu. for the check. Potassium sul- 

 phate alone resulted in an average yield of 121.8 bu. Manure used in combi- 

 nation with either rock or acid phosphate failed to give any appreciable effect 

 As an average of ."> years, different phosphate treatments used in a 4-yeaz 

 rotation have given the following results: Rock phosphate 91.2 bu. per acre, 

 manure 99.5 bu., and acid phosphate 104.18 bu.. as compared with 81.58 bu. 

 from the check. It is stated that manure has given the most economical gains. 



The 3-year rotation in the fertilizer series produced 144 bu. of potatoes per 

 acre as compared with 107.4 bu. from the 4-year rotation. In the agronomy 

 series the 7-year rotation was best with 98.6 bu. per acre, while the 3-year 

 rotation produced only 71 bu., said to be due largely to the early summer 

 drought and the poor physical condition of the plat 



[Eeport of field crops work at the Grand Rapids substation. 1917], O. I. 

 Bergh (Minnesota Sta. Rpt. 1918, pp. 89, 90. Si).— This briefly describes the 

 progress of work along lines similar to those previously noted (E. S. K . 89, 



