FIELD CROPS. 239 



yield except Danish Chevalier, a two-rowed variety, which gave a crop of 2 hu. and 

 24 IVks. per acre less from selected than from nnselected seed. The increase in 

 yield ranged from 40 1V)S. to 8 lin. and 40 lbs. per acre. At the same station in a simi- 

 lar test with spring wheat 6 varieties gave a larger yield from selected seed as com- 

 pared with nnselected seed, while 2 varieties gave the same yield from both kinds of 

 seed. The same test with wheat and l)arley at the ^Manitoba Station resulted in yields 

 sometimes in favor of selected and sometimes in favor of nnselected seeds. 



At Ottawa a test of growing oats after different crops resulted in the best yields 

 after horse beans. The smallest crops were obtained after millet, flax, and soy beans. 

 Trials were also made of plowing under green clover for oats, corn, and potatoes, and 

 in every case an advantage was apparent in the yield. Spring wheat grown after 

 different crops in ^Manitoba gave much larger yields when preceded by legum'nous 

 crops than by cereals. 



One series of fertilizer experiments at Ottawa was made with fresh and rotted barn- 

 yard manure, fresh slaked lime, superphosphate and Thomas slag, all applied singly 

 to spring wheat and oats. The results did not differ much, and it is concluded that 

 the land contained all the available plant food the crops could utilize. In a second 

 series of experiments with different fertilizers on wheat, barley, and oats the best 

 average results for 13 years have been with barnyard manure (about equal parts of 

 horse manure and cow manure), and slightly better results have been secured from 

 the use of fresh manure than from well-rotted manure. 



The itemized cost of growing different crops at the Central farm are reported, with 

 an estimate of the cost of digestible dry matter in each crop. 



At the Ottawa Station an ex]ieriment was conducted in planting potatoes at differ- 

 ent depths from 1 to 8 in. Level cultivation was adopted and so but little soil wa.s 

 thrown on the potatoes after planting. The best average yields for three years were 

 obtained from planting 1 in. deep. As in previous years, it was found that most of 

 the tubers were formed within 4 in. of the surface of the soil, even where the seed 

 had been planted deeper, and where the sets were planted less than 4 in. deep nearly 

 all the tul)ers were formed between that and the surface of the soil. At the farm in 

 the Maritime Provinces barnyard manure was compared with commercial fertilizers 

 on early potatoes, the results with the different fertilizers showing the largest yields 

 from the plants treated with manure. 



Some experiments were made at different stations to compare the growth of vari- 

 ous grains as mixtures and as pure grains. At Ottawa the best yields of grain were 

 obtained from a mixture of 1 bu. each of barley, oats, and peas, and a mixture com- 

 posed of I bu. of wheat, 1 bu. of oats, | bu. of peas, and | bu. of barley. The yields 

 of grain of these two mixtures grown on 2-acre plats were practically the same, but the 

 yield of oats alone, which was the largest in the series, was about one-third greater. 

 As in the previous year in the Maritime Provinces a seeding mixture of 2 bu. of oats, 

 1 bu. of barley, and ^ bu. of peas gave a higher yield of grain than oats grown alone, 

 and sowing this mixture at the rate of 3 bu. per acre gave larger yields than smaller 

 amounts. In British Columbia a mixture of 1 bu. each of peas, oats, and l)arley 

 gave slightly better yields than a similar mixture of peas, oats, and wheat. 



There was practically no difference in yield of clover from seed inoculated with 

 Nitragin and from untreated seed at the British Columbia farm. 



The highest average yields in experiments of sowing wheat, oats, and barley 1, 2, 

 and 3 in. deep at the Manitoba Station were obtained froui the medium depth of .sow- 

 ing. A variety test with 56 varieties of tobacco was conducted at the Central Station 

 as to the time of ripening and productiveness. The results of only 6 varieties, all of 

 which had fully matured September 7, are recorded in a table. No conclusions are 

 drawn. 



The results of a comparative chemical study of Ked Fife, Preston, Stanley, and 



8347— No. 3—01 4 



