Effects of weeds on cultivated crops
Answers
Answer:
1.Competition for mineral nutrients: Being hardy and vigorous in growth habit; they soon outgrow the crops and consume large amount of water and nutrients. Thus causing heavy losses in yields. For e.g. Mani, found that on an average weeds growing in crop field during the kharif season removed 46.6 kg/ha N, 12.1 kg/ha P and 73.3 kg/ha K.
2.Competion for water: For producing equal amount of dry matter, the weeds, in general transpire more water than most crop plants. It is reported that wild mustard transpires about four times more water than a crop of oat.
3.Competition for Solar Energy: About 99% of dry matter in plants is made up of organic matter that is dependent on solar energy. When plants are mutually shaded, their production potential is greatly reduced even though water and other nutrients are available to them in abundance.
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