"Chemical Fertilizer" Salt Fertilizer PPT Courseware 5

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"Chemical Fertilizer" Salt Fertilizer PPT Courseware 5

Review and consolidate

1. Among the following substances, the one with the largest mass fraction of nitrogen is ( )

A. (NH4)2SO4 B. CO(NH2)2

C.NH4HCO3 D.NH4NO3

Related relative atomic mass:

C: 12 H: 1 O: 16 N: 14 S: 32

(1) Why are chemical fertilizers used in agricultural production?

Plants need nutrients to grow, and the nutrients that the soil can provide are limited, so they must be supplemented by fertilization.

The fertilizers initially used were natural organic fertilizers made from human and animal excrement, plant matter, etc. With people's understanding of the relationship between chemical elements and plant growth, chemical and physical methods have emerged to produce chemical fertilizers containing nutrients needed for crop growth. Nowadays, the application of chemical fertilizers has become the most powerful measure to increase crop production. The application of chemical fertilizers accounts for 30% to 60% of the total of various production-increasing factors.

Four-person study group discussion

1. Does nitrogen-containing nitrogen belong to nitrogen fertilizer? Why?

No, most plants cannot absorb nitrogen directly, only nitrogen-containing compounds

2. Why do leguminous plants such as soybeans and broad beans require no or only a small amount of nitrogen fertilizer?

Because they have rhizobia bacteria on their roots that can convert nitrogen in the air into nitrogen-containing compounds that can be absorbed by plants. (fixation of nitrogen)

3. Which of the following substances can be used directly as fertilizer ()

A. Phosphoric acid (H3PO4)

B. Ammonia (NH3.H2O)

C. Potassium hydroxide (KOH)

D. Nitric acid (HNO3)

4. Which of the following chemical fertilizers are compound fertilizers (multiple choice question) ( )

A. NH4Cl B. NH4NO3

C. KH2PO4 D. KNO3

Discussion: Pros and Cons of Using Fertilizers and Pesticides:

Pros: Fertilizers and pesticides play an important role in increasing crop yields.

Disadvantages: The unreasonable use of chemical fertilizers and pesticides can cause many environmental problems. Such as soil pollution, water pollution, air pollution.

ultimately harming human health

Thinking: What should be done to use pesticides and fertilizers rationally?

The key is to prescribe the right medicine to achieve the highest control effect with the least amount of pesticides and fertilizers

[Test in class]

1. The following chemical fertilizers are compound fertilizers:

A. NH4Cl B. NH4NO3

C. NH4HCO3 D. KNO3

2. The plants planted in a classmate’s home are shorter and thinner than normal plants, with yellow leaves and, in severe cases, light brown veins. Which of the following fertilizers do you think should be applied:

A. Potassium chloride B. Potassium sulfate C. Superphosphate D. Urea

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Update Time: 2024-12-10

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