INTRODUCTION
Weeds are the plants, which grow where they are not wanted. They grow in fields where they compete with crops for water, soil nutrients, light and space and thus reduce crop yields. They also harbour insects, pests and micro-
organisms. Certain weeds release into the soil the inhibitors or poisonous substances which are harmful to the plants, human being and livestock. They
increase the expenditure on labour and equipment, render harvesting difficult and reduce the quality and marketability of agricultural produce.
OBJECTIVES
After going this lesson, you will be able to
• explain characteristics of weeds
• describe damages caused by the weeds
• define weed control methods
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