Archive image from page 45 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 20 THE PLANT: ITS STRUCTURE, LIFE - PROCESSES AND ENVIRONMENT exposed to light, assumes a cactus-like habit, with no leaves and with very short internodes and thick- ened stems. The water-supply directly influences the produc- tion of flowers and fruit. Aquatic plants cannot as a rule produce flowers under water. Land plants with abundant water-supply run to stem and leaf, and produce
Archive image from page 45 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 20 THE PLANT: ITS STRUCTURE, LIFE - PROCESSES AND ENVIRONMENT exposed to light, assumes a cactus-like habit, with no leaves and with very short internodes and thick- ened stems. The water-supply directly influences the produc- tion of flowers and fruit. Aquatic plants cannot as a rule produce flowers under water. Land plants with abundant water-supply run to stem and leaf, and produce little fruit. Cutting off the water sup- ply at the proper time greatly increases the pro- duction of fruit, and also makes it sweeter and of higher flavor. By irrigating properly, we may con- Fig. 43. The reach for light of a tres on the edge of a wood trol both the quantity and quality of the crop. An excess of water soon kills the plant by suffocating the roots. Light.—The effect of light on the plant is very similar to that of dryness, and in the case of desert plants the strong light increases the effects due to lack of water. Plants that prefer the sun are known as sun-plants (grasses), while those that can grow only in shade are known as shade-plants (ferns). The latter have longer, thinner leaves, usually of paler color. A similar difference may often be observed between exposed and shaded leaves on the same individual plant. The exposed leaves have thicker epidermis, longer palisade cells, smaller air-spaces and fewer stomata. Both leaves and branches arrange themselves with reference to the direction of the light, and the same is true to a large extent of flowers. This is well illustrated by plants that grow near houses so that they are shaded on one side. A further illustration is the different arrangement of leaves on upright and on horizontal branches of the same plant. Excessive light produces ' sunscald' and other bad effects. Some leaves avoid this danger
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