Transactions of RHASS Volume 1940 - Page 024
Image details
| Year | 1940 |
|---|---|
| Transcription |
|
| OCR Text |
, 7mm; ’1 umth l ‘ Mr Villa ‘l‘ l ‘l p. l . l lt l 36 STOCK-FEEDING UNDER WAR CONDITIONS. only the kinds and quantities of concentrates that are likely to be available : Live- Longth St Fat _ l . Date of 13.231031? \Ycioglltit Weight Dally Ration xvégfigt Time ' ' lb. lb. 11 cells lb. 11). . . per week. 1899 10 Greyface 96 115 Swedes, 15-3; Dried Grams, 1-93 102 . 91 108 Swedes, 14"7; Oats, 0'2_3; 1‘71 1899 10 do Dried Grains, 0~23; Lin— seed Cake, 0'23 15— Gre face 80 102 Turnips, 14'7; Hay, 0'68 1'47 15) dyo. 80 116 Turmps, ]4_; Hey, 0'47; 2-42 Undecortieated Cotton Cake, 0-73 H 0 i0 9 60 . 80 119 Turni 5, 12‘7; ay, ': ; _.' 1900 15 do Drigd Brewers’ Grams, 0'73 #1 H lf-bred_ 101 128 Swedes, 17‘3; Hay, 0'47 2‘06 lg aJdo. 10] 137 Swedes, 16'3; Hay, 0‘38; 271 ' Bombay Cotton Cake, 0‘35; Dried Brewers’ Grains, 0'35 2 . d 91 116—— Turni s, 14.2; Hay, 0-28; 2~07 1906 1 Half bye Borgibay Cotton Cake, 0.83 H 0 37 2 ‘36 d . 93 121 Turnips, 13-7; ay, ' ; -. 1906 12 o Linseed Cake, 0'41; Bombay Cotton Cake, 0'41 1t is not, of course, to be denied that foods of highfattening value, Such as flaked maize and linseed cake, W111 glve better results than poorer materials such as poor-quahty oats, dried grains, and cotton cake. The richer foods are, mdeed, specially useful at the finishing stage, and if they are to be had only in limited amounts they should be kept until the last part of the feeding period. But for the greater part of the t1me the feeder can dispense with them. THE CONTROL OF PESTS OF FARM AND GARDEN CROPS. By PROFESSOR JAMES HENDRICK, B.Sc., F.I.C., and WALTER MOORE, B.Sc., University of Aberdeen and North of Scotland College of Agriculture. IN the intensive cultivation of crops there are a number of factors which tend to suppress the growth of plants. One of the chief limiting factors is the group of organisms classified as plant parasites or pests, which in the course of their existence cause direct injury to the plant and prejudice in many different ways its successful development. When we grow crops, and thus increase the number of plants of one kind, we produce conditions which tend to favour the multi- plication of pests of the crop we are growing, and the pests in turn will reduce the productivity of the host until a natural balance is reached. The aim of crop husbandry is to modify this balance by increasing the growth of the plant and diminish- ing the incidence of pests. It is because of the tendency of pests to increase with an increase in the number of host plants that there arises the need for plant protection. In war-time it is necessary to increase the production of food crops to the utmost ; it is at such a time that it is specially important to study the means of keeping in check the pests which destroy our crops. All pests depend upon some means of carriage from one plant to another. If, for example, an oat plant only grew at isolated intervals among other plants, the chance of the spores of smut being blown by the wind from one plant to another would be small. When we grow oats as a field crop, however, we greatly increase the chances that the spores produced on an infested plant will find another host. Many inSects also depend for their distribution upon the proximity of suitable plants to an infested host. CONTROL MEASURES. There are three main methods, which are used either singly or in combination, by which plant pests are controlled. These are :— (1) By breeding plants resistant to the pest in question. (2) By proper nutrition of the plant. (3) By the application of substances injurious to the pests, which are known as insecticides and fungicides. |
| Title | Transactions of RHASS Volume 1940 - Page 024 |
