THE CANADIAN HORTICULTURIST. 



a considerable amount of Mustard. 

 The size of the plot treated in each 

 case was one-tenth of an acre, and the 

 quantity of solution uniformly supplied 

 to each area was five gallons, or at the 

 rate of 50 gallons per acre. The date 

 of spraying was June 26th, the grain 

 being from 15 inches to 20 inches 

 high, and the Mustard practically the 

 same height and just coming into 

 flower. The chief data may be briefly 

 stated as follows : — 



Sulphate of Iron, 5 per cent. : No 

 effect upon barley. The leaves were 

 practically all stripped from the stems of 

 the mustard, but the weed was not killed, 

 as evidenced by the new leaves subse- 

 quently starting, the plant flowering and 

 the seed-pods filling out and maturing. 

 The leafless stems were quite green a 

 fortnight after the spraying, and were 

 apparently furnishing nourishment to the 

 seed. 



Sulphate of Iron, 10 per cent. : A 

 slight scorching of some of the leaves 

 of the barley was to be noticed. A 

 fortnight after the spraying this was not 

 discernable, and, though this spray may 

 have slightly retarded growth, it is not. 

 probable that the yield of grain was 

 affected. 



Though the effect upon the mustard 

 was more pronounced than in the fore- 

 going instance, as noticed by the "spot 

 ting " on the stems, it was not suffi- 

 ciently strong to prevent flowering and 

 the ripening of the seeds, a large pro- 

 portion of which proved, upon testing, 

 to be vital. 



Sulphate of Copper, 2 per cent. : A 

 certain amount of injury to the leaves 

 of the barley resulted, evidently retard- 

 ing growth to a somewhat greater degree 

 than the 10 per cent. Iron Sulphate 

 solution. At the end of two weeks, 

 however, this effect had practically all 



disappeared, and it became doubtful if 

 there were any permanent injury to the 

 grain. The mustard very quickly and 

 markedly showed the effect of the spray- 

 ing, both the stems and the leaves dying 

 without allowing the plant to seed. Two 

 weeks after spraying, a few living mus- 

 tard plants were found in the plot, but 

 it is believed they had escaped the 

 solution, owing to the height and over- 

 shadowing of the barley. 



Sulphate of Copper, 5 per cent. : This 

 solution damaged the barley in a much 

 more pronounced manner than the pre 

 ceding solution ; in all probability it 

 somewhat lessened the yield of grain, 

 though, as the ground was very uneven 

 in character, no comparative data on 

 this point could be obtained. 



The mustard was all killed ; an in- 

 spection two weeks after the spraying 

 did not reveal any living plants. 



In order to ascertain the effect of 

 these solutions upon this weed at a 

 younger stage of growth than that just 

 reported upon, mustard seed was sown 

 in rows in a plot upon the Experimental 

 Farm. When the mustard plants had 

 reached the height of six to nine inches 

 they were sprayed, as follows : July 

 20th — Sulphate af Iron, 5 per cent. : 

 Not all killed ; the few survivors pos- 

 sessed green stems and in time sent out 

 new leaves. It is extremely doubtful, 

 however, if the plants will have sufficient 

 strength to flower. Sulphate of Copper, 

 two per cent. : All the plants died within 

 a few days. 



July 22nd — Further sprayings were 

 made. Sulphate of Iron, 5 per cent. : 

 The stems were stripped of all their 

 leaves, but in the course of a few weeks 

 fresh leaves had appeared on many of 

 the plants. Sulphate of Iron, ten per 

 cent. : Though somewhat more severely 

 attacked than by the five per cent. 

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