Chemistry - 0620 CIE

Fertilisers

Gbogbo ọrọ náà

Every harvest takes nutrients out of the soil, and unless they are put back the land slowly stops being able to feed crops. Fertilisers are the chemicals that replace those lost nutrients, and they are one of the main reasons farmers can grow enough food for a growing world population.

In this lesson you will learn that ammonium salts and nitrates are used as fertilisers, and what NPK fertilisers are: mixtures that supply the three key elements nitrogen, phosphorus and potassium for healthy plant growth. You will see why each element matters and how these fertilisers are made.

Ebumnobi

State that ammonium salts and nitrates are used as fertilisers.
Describe the use of NPK fertilisers to provide the elements nitrogen, phosphorus and potassium for improved plant growth.

Akọmọ Ojú-ẹkọ

Feeding the world depends on fertilisers. Crops strip nitrogen, phosphorus and potassium from the soil as they grow, and fertilisers replace them so the same land can be farmed year after year. Understanding what fertilisers contain and why links chemistry directly to agriculture and food security.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Fertilisers. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which of these is used as a nitrogen fertiliser? A. Sodium chloride B. Ammonium nitrate C. Calcium carbonate D. Copper sulfate Answer: B
What do the letters N, P and K stand for in an NPK fertiliser? A. Nitrogen, phosphorus, potassium B. Nitrogen, potassium, krypton C. Neon, phosphorus, potassium D. Nitrate, phosphate, potassium Answer: A
Ammonium nitrate is made by reacting ammonia with: A. Sulfuric acid B. Hydrochloric acid C. Nitric acid D. Carbonic acid Answer: C
Which element in a fertiliser mainly promotes strong root growth? A. Nitrogen B. Phosphorus C. Potassium D. Carbon Answer: B
Why are ammonium salts and nitrates good fertilisers? A. They are insoluble B. They supply nitrogen and dissolve in soil water C. They are acidic gases D. They remove nutrients Answer: B