Question

Weedicides are used to destroy?

Answer 1

Hint: Weeds are unwanted plants that grow among desired crops and compete for sunlight, nutrients, water, and other resources. Weeds obstruct a wide range of human activities, and numerous methods have been developed to suppress or eliminate them. These methods differ depending on the weed's nature, the disposal method available, and the method's relationship to the environment.

Complete answer:
Chemical weed control (see herbicide) has been around for a long time: sea salt, industrial byproducts, and oils were the first to be used. Selective control of broad-leaved weeds in cereal crop fields was discovered in France in the late 1800s and quickly spread throughout Europe. Copper and iron sulphates and nitrates were used, but sulfuric acid was even more effective.

Spraying was used for application. Sodium arsenite quickly gained popularity as a spray and a soil sterilant. During the first three decades of the twentieth century, diesel oil was introduced as a general herbicide and sodium dinitro cresylate (Sinox) as a selective plant killer.

Weedicides are chemicals that are sprayed on fields to kill weeds. They will have no effect on crop plants. Weedicides that are commonly used include 2,4-D Ethyl ester, Neem extract, Glyphosate, and others.

The year 1945 signalled the start of a new era in chemical weed control. The following chemicals were introduced: 2,4-D (2,4-dichlorophenoxyacetic acid), 2,4,5-T (2,4,5-trichlorophenoxyacetic acid), and IPC (isopropyl-N-phenylcarbamate), the first two selective as foliar sprays against broad-leaved weeds, and the third selective against grass species when applied through the soil.

The new herbicides were groundbreaking because their high toxicity allowed for effective weed control at dosage rates as low as one to two pounds per acre. This was in contrast to carbon bisulfide, borax, and arsenic trioxide, all of which were required at rates of up to one tonne per acre, and sodium chlorate, which was required at rates of around 100 pounds per acre.

However, some of the early herbicides, such as 2,4,5-T, were later deemed unsafe for humans and the environment and were phased out in many countries. Herbicides that are effective have continued to be developed, and some, such as glyphosate, are widely used worldwide.

Thus weedicides are used to destroy weeds.

Note: The ease of application is a significant advantage of chemical weed control over mechanical weed control. This is especially true in cereal croplands, pastures, rangelands, forests, and other areas where an aeroplane could be used. Every year, millions of acres are treated from the air, and new equipment for treating row-crop land with herbicides has made weed control more convenient.