. Diseases of glasshouse plants. Greenhouse plants; Plant diseases. 40 DISEASES OF GLASSHOUSE PLANTS fungi, and it will thus be apparent that waterlogged conditions, although they may persist only for a short time, have a deleterious effect upon plants and reduce their resistance to disease. The appearance of plants grown under waterlogged soil conditions is admirably illustrated by an experiment conducted with tomatoes. A metal trough ten feet long, two feet wide, and two feet deep was placed on the ground and one end tilted up to rest on a support a foot high, as in Fig. L A perforated woode
. Diseases of glasshouse plants. Greenhouse plants; Plant diseases. 40 DISEASES OF GLASSHOUSE PLANTS fungi, and it will thus be apparent that waterlogged conditions, although they may persist only for a short time, have a deleterious effect upon plants and reduce their resistance to disease. The appearance of plants grown under waterlogged soil conditions is admirably illustrated by an experiment conducted with tomatoes. A metal trough ten feet long, two feet wide, and two feet deep was placed on the ground and one end tilted up to rest on a support a foot high, as in Fig. L A perforated wooden board was. Tank Wooden bcttom Fig. 1. Diagram illustrating an experiment on the relation of waterlogged soil conditions to chlorosis of the tomato. placed in the trough, resting on the bottom of the tilted end, laid parallel to the ground, and supported on bricks at the other end. The space between the board and the trough bottom was filled with water and a siphon with tap was fitted at the deeper end. Nine inches of compost was placed on top of the board, and six tomato plants (Kondine Red) were planted at equal distances. The soil was well watered, and after a time the level of the water was adjusted to the level of the board by means of the siphon, and was kept at this level throughout the experiment. The plants were numbered for purposes of description. No. 1 being at the low end of the trough and No. 6 at the tilted end. Within five days plant No. 1 began to show signs of ill health. The lower leaves turned yellow and withered and the plant showed no new growth. The yellowing and the withering of the leaves continued up the stem until in 17 days the plant was dead. Plant No. 2 developed similar symptoms in 14 days and was dead in 43 days. In 31 days No. 3 began to show signs of yellowing and lost the five bottom. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantdi, bookyear1923
