WORK OF THE DELTA EXPERIMENT FARM IN 1912. 



11 



Table IV. — Results obtained with potatoes at three different depths of plowing at the 



Delta Experiment Farm in 1912. 



The yields, as shown in Table IV, increased with the depth of 

 plowing, but the difference between th el 2 and 18 inch plowing was 

 probably not enough from the standpoint of one season's yield alone 

 to justify the added expense of the IS-inch plowing. 



DEPTH-OF-PLANTING TEST. 



On field I an experiment in depth of planting in connection with 

 two depths of plowing was tried. Alternate lands were plowed, 

 respectively, 6 and 12 inches deep in March, and potatoes were 

 planted in June, 4 and 8 inches deep on each kind of plowing. Eight 

 half-acre plats were used in this test. The yields of marketable 

 tubers per acre are shown in Table V. 



Table V. — Yields of warketahle potatoes obtained from planting at different depths at 



the Delta Experiment Farm in 1912. 



It is seen that with shallow plowing deep planting gave better 

 results than shallow planting and that the results on the deep-plowed 

 plats were contradictory. 



COMPARISON OF LOCAL AND IMPORTED SEED. 



Conditions for storing seed potatoes in the delta region are ordi- 

 narily not favorable. As there are no facilities for cold storage or 

 for storing in pits, seed carried over from harvest to planting time is 

 frequently weakened by sprouting. In order to determine the effects 

 produced by using locally grown seed as compared with those result- 

 ing from the use of seed of the same variety shipped in from Oregon 



ICir. VH\ 



