Question

Q21. The manual pulling of weeds out of the land is called a) Mechanical method (b) cultural method (c) biological method (d)chemical ps help me

Answer 1

Answer:

b. cultural method

Explanation:

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Answer 2

Answer:

Mechanical weed control is an physical activity that inhibits unwanted plant growth.[1] Mechanical, or manual, weed control techniques manage weed populations through physical methods that remove, injure, kill, or make the growing conditions unfavorable. Some of these methods cause direct damage to the weeds through complete removal or causing a lethal injury. Other techniques may alter the growing environment by eliminating light, increasing the temperature of the soil, or depriving the plant of carbon dioxide or oxygen.[2] Mechanical control techniques can be either selective or non-selective. A selective method has very little impact on non-target plants where as a non-selective method affects the entire area that is being treated. If mechanical control methods are applied at the optimal time and intensity, some weed species may be controlled or even eradicated.[3]