摘要:

The results of protein determinations on 28 varieties of spring wheat grown in quadruplicate rod-row plots at each of three Dominion Experimental Stations were analyzed statistically. The error due to plot variability greatly exceeded the laboratory error. No real differences were found between the calculated percentages for composite samples made up from the four plots of each station and the percentages obtained by averaging the results from the individual plots.Some of the varieties showed definite tendencies towards high protein content. The major environmental effects of station and of replication gave negative correlations between yield and protein content but when these major factors together with the influence of variety were removed, yield and protein content were not correlated.

ISSN:1923-4287    

DOI:10.1139/cjr36c-029

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

Surveys of pasture flora in Quebec have led to the recognition of four layers,viz., turf, tall herbaceous, shrub and tree. The human factor is advanced as the most important single agency determining the existing plant life but water supply and the fertility level exert important effects.The soils under investigation carry sufficient seed to produce, on the average, 77 million potential plants per acre, but these seeds show a low correlation with the plants prevalent in the sward. It was revealed that each mature cow voidsmillion viable seeds per grazing season and that these seeds are closely related to the components of the sward.Where phosphorus was applied as superphosphate at a rate of 700 lb. per acre, it was shown that most of that element was fixed in the top half-inch of soil and that the available portion of it was largely depleted after three crop years. Pot cultures of pasture soils growing eitherPhleum pratenseorTrifolium repensshow that calcium has depressed and sulphur has increased both the herbage yield and the uptake of phosphorus. The organic fraction of phosphorus in soils has been identified as containing 0.5% of lecithin and 65% of nucleic acid. The latter has been extracted quantitatively in pure form.Mixed herbage and pure grass species have been fed to rabbits as a means of determining feeding value. The 35 groups fed have given highly variable results. Statistical examination of the data shows little if any correlation between gains and the constituents of the herbage as determined by a standard feeding-stuffs analysis. It has been tentatively concluded that the condition of the fibre, depending on the proportion of ligno and hemicellulose, is the most likely cause of the variability. The study is proceeding.

ISSN:1923-4287    

DOI:10.1139/cjr36c-030

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

Chicken antiserum was produced by three wing vein inoculations with sap fromDatura meteloidesandDatura Stramoniumplants infected with "potato virus X". Before injection, the saps were purified by the Bawden and Pirie method. This antiserum formed a conspicuous precipitate when incubated for three hours at 37 °C. with similarly purified sap of these two plant species when they were infected with the X or healthy potato virus, but failed to form any precipitate when incubated in the same way with purified sap from virus-free plants. Two unknown viruses, one from spinach and the other from tomato were established as belonging to the X group by the precipitin reaction through the use of chicken antisera. The serological grouping was supported by the fact that the unknowns had similar, if not identical lethal temperatures, longevities in vitro, and host ranges as the ordinary potato virus X.

ISSN:1923-4287    

DOI:10.1139/cjr36c-031

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

A streak disease of tomatoes was found to be caused by a virus of the potato X group unassociated with tobacco virus 1. The disease markedly reduced the yield of marketable fruit in several greenhouses near Victoria. The symptoms resemble those induced by ordinary potato virus X in conjunction with tobacco mosaic. The host range, lethal temperature, longevityin vitro, and dilution extinction point of the virus resemble ordinary potato X. Streak X may be distinguished from ordinary potato X by the more pronounced symptoms it induces on tobacco,Datura, Nicotiana glutinosa, and tomato, and particularly by the streaking and necrosis of the stems and leaves of tomato. The virus causing this streak disease could not be recovered from Irish Cobbler potatoes after an incubation period of ten days, neither did the characteristic symptoms occur on tomatoes already infected with the ordinary potato virus X. The virus was recovered unchanged from X-free potato seedlings. The antigen reaction also proved that the streak virus belonged to the potato virus X group.

ISSN:1923-4287    

DOI:10.1139/cjr36c-032

出版商:NRC Research Press    

年代:1936

数据来源: NRC