WORK OF THE DELTA EXPERIMENT FARM IN 1912. 13 



crease in yield, but the vegetative vigor of the plants and their resist- 

 ance to wih were markedly increased. 



(7) In the test of 6, 12, and 18 mch plowing the yield increased 

 with the depth, but the difference between the 12-inch and the 18-inch 

 plowing was not sufficient to justify the added expense of the latter. 



(8) On the shallow plowed land 8-inch planting gave higher yields 

 than 4-incli planting, but no consistent difference in yield was noted 

 on the deep-plowed land. 



(9) Decidedly higher yields were obtained from sound Oregon seed 

 than from locally grown seed, the difference appearing to be due to 

 the deterioration of the locally grown seed resultmg from miproper 

 storage. 



(10) With the exception of the plats treated with sulphuric acid no 

 consistent differences were shown in the wilt percentages, nor were 

 any consistent differences shown in the scab percentages. 



(11) One significant feature of the season's work was the uniformly 

 thin stand on the fields. An examination of the plats following plant- 

 ing tune showed that the decrease in stand on the old land was due to 

 the very rapid rotting of the seed in the ground. The mvestigations 

 along this line durmg the crop season of 1912 lead to the conclusion 

 that the rotting of the seed pieces, resulting in thin stands and weak 

 plants, is perhaps the most important factor causing decrease of 

 yield. 



[Civ. 127] 



