Which is not a role of chemistry in modern agriculture?

improving machinery

enriching soil

developing pesticides

conserving water

The right answer is improving machinery

Machinery is a term that is far away from chemistry.

The current relations between agriculture, chemistry and society are far from simple. Scientific agronomy is nevertheless the daughter of chemistry that has allowed the discovery of the fundamentals of plant nutrition and has made it possible to fight against pests. The contribution of fertilizers and phytosanitary products made it possible to optimize the agricultural surfaces and to develop the intensive agriculture whose model is now questioned.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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