. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. ta Station.)Fig. 245.—Buckhorn Plantain; 1, entire plant; 3, seedling; 4, seed enlarged. (Minnesota Station.) milkweed, dandelion, thistle and others may be carried by strongwind to distant places. Still others, such as the clock and wildcarrot, may be blown somewhat by the wind and will alsofloat upon water, where they are carried by either waves or cur-rents to new fields. Many pe
. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. ta Station.)Fig. 245.—Buckhorn Plantain; 1, entire plant; 3, seedling; 4, seed enlarged. (Minnesota Station.) milkweed, dandelion, thistle and others may be carried by strongwind to distant places. Still others, such as the clock and wildcarrot, may be blown somewhat by the wind and will alsofloat upon water, where they are carried by either waves or cur-rents to new fields. Many perennial weeds have other means of spreading than byseeds. The underground stems, runners, etc., will spread of the worst grasses, Canada thistle, sheep sorrel, toad flaxand many more are thus spread. Frequently such seeds are PRINCIPLES OF WEED CONTROL 349 spread by means of tillage implements which merely transfer themfrom place to place. The more quack grass is cultivated the moreit may be spread. Principles of Weed Control.—It is important to study the life ofa weed if you wish to eradicate it. Learn its habits and then youcan control it. It is easy to detect a weed that stores nourishment. Fig 246.—Base of Johnson grass showing the joints on the underground stems or roots,from which numerous grass stems arise. This makes it a serious weed. in the underground parts. One can find the mass of stored materialby pulling it up. Then you know it is not an annual. If weeds have abundant rootstocks, as quack grass and Canadathistle, you cannot hope to find all of these numerous growthsramifying the soil. The control methods recommended in eachcase are to smother the plant. Remember that plants cannot live if they do not have leavesexposed to the air during a part of the growing season. In chickenyards and pig pens where the leaves are continually eaten off the 350 CONTROL OF WEEDS roots and underground stems are killed. Light and air are neces-sary for the successfu
Size: 1292px × 1935px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectfruitculture, booksubjectgardening
