摘要:

Determinations made on 144 samples of malt, representing 12 varieties grown at 12 experimental stations in Canada, show that varietal differences exist with respect to starch liquefying activity (max. 768, min. 275 units) and autolytic diastatic activity (max. 958, min. 664 units). Varieties of poor malting quality tend to be low with respect to both properties. The effect of environment is also considerable (liquefying, max. 510, min. 288; autolytic, max. 806, min. 704).The correlation coefficients among liquefying, autolytic diastatic, saccharifying, and proteolytic activities of malt and total barley saccharifying activity were studied. Significantinter-varietalassociations exist between each pair of properties, but partial correlation studies suggest that only those between saccharifying activities of barley and malt (r = 0.90), and between liquefying and autolytic activities of malt (r = 0.97), represent real and close relations. The other associations between pairs of enzymatic activities seem to reflect mainly positive correlations between each activity and total salt-soluble nitrogen in the barleys.Significantintra-varietalassociations exist between each pair of enzymatic activities, and between each activity and total barley nitrogen. It appears that environmental factors which tend to increase total nitrogen also tend to increase each enzymatic activity, but these do not increase regularly with respect to each other and are not closely related. Partial correlations independent of total nitrogen suggest that only barley and malt saccharifying activities (r = 0.67) and liquefying and autolytic activities of malt (r = 0.63) are related within varieties.It appears that the rate of autolysis in samples of different varieties from the same station is controlled almost entirely by starch liquefying activity, but the latter property is not the limiting factor controlling autolysis in samples of the same variety from different stations. Within varieties some other factor, presumably starch resistance, must play an important part.

ISSN:1923-4287    

DOI:10.1139/cjr39c-035

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The physiological activity of a series of indolyl acids, from the acetic to the valeric, including 5-methyl-indolylpropionic, has been determined by the rooting responses ofLonicera tartaricacuttings treated with solutions of each. Indolylbutyric acid was the most active chemical, affecting the number and length of roots per rooted cutting, the mean root length, the green weight of leaves, and the fresh root weights. Indolylacetic acid had significant effects on the number and length of roots per rooted cutting. Slight activity was shown by indolylpropionic acid, but neither indolylvaleric acid nor 5-methyl-indolylpropionic showed any significant treatment effects. None of the acids affected the number of cuttings rooted.

ISSN:1923-4287    

DOI:10.1139/cjr39c-036

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

In a comparison of the rooting responses of cuttings of Norway spruce from upper branches, in which one lot was stored under snow from November until early April and the other collected in late March, there were statistically significant differences. After 12 weeks 38.9% of the November, and 20.7% of the March, cuttings were rooted or calloused. At the end of the propagation period 45.2% of the November, and 66.6% of the March, cuttings were dead. Indolylacetic acid dust treatment did not have a significant effect on the number of cuttings rooted or calloused; it did, however, increase the number that were dead at the end of the experiment.

ISSN:1923-4287    

DOI:10.1139/cjr39c-037

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

A study was made at Winnipeg in 1938 to determine the effect of leaf rust on the yield and quality of Thatcher and Renown wheat. In one experiment, Thatcher and Renown were sown late in 1/400-acre plots; in another, Thatcher only was used and was sown early in rod-row plots. Half the plots of each variety were kept as free from leaf rust as possible by frequent applications of sulphur dust, but the remaining half became heavily infected. In the 1/400-acre plots, leaf rust reduced the yield of Thatcher and Renown by 51.17 and 29.61%, respectively; in the rod-row plots of Thatcher, it reduced the yield by 37.02%. The decrease in yield was due more to reduction in kernel weight than to reduction in number of kernels per head. All the non-dusted plots ripened approximately three days earlier than the dusted, and the grain from them graded one grade lower than that from the corresponding dusted plots. In both varieties, the protein content was diminished while the carotene content was increased.

ISSN:1923-4287    

DOI:10.1139/cjr39c-038

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Measurements of the height of the main stems of maize and gladiolus plants were made at four-hour intervals starting at 4 a.m. The increases in elongation were analyzed statistically, together with mean temperature, hours of sunlight, and mean relative humidity.Partial correlation coefficients showed that there was a highly significant positive association between the rate of stem elongation (growth) and temperature, regardless of the time of day, the variations in temperature accounting for from 40 to 70% of the variability in growth rates. There was likewise a significant negative correlation between growth and sunlight, but sunlight was apparently effective only during the midday periods (8 a.m. to 4 p.m.). The depressing effect of sunlight on the growth of gladiolus was approximately four times as great as on maize. This depressing effect on maize was entirely removed by shading the plants with light white cotton.Variations in relative humidity were only slightly associated with growth rates. No significant effect was observed for any of the periods. It seems possible that these factors might be more important under conditions of deficiency in soil moisture.The approximate minimum temperature at which growth look place was 40° F.

ISSN:1923-4287    

DOI:10.1139/cjr39c-039

出版商:NRC Research Press    

年代:1939

数据来源: NRC