Understanding NPK Ratios and Fertilizers

Understanding NPK Ratios and Fertilizers

Assessment

Interactive Video

Horticulture

9th - 12th Grade

Hard

Created by

Patricia Brown

FREE Resource

This video tutorial explains the NPK ratio in fertilizers, focusing on nitrogen, phosphorus, and potassium. It provides detailed calculations for determining the percentage and weight of these nutrients in fertilizer packages. The tutorial includes examples to illustrate the process and addresses common misconceptions about NPK ratios.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it important for horticulture students to understand NPK ratios?

To reduce water usage

To ensure proper nutrient supply

To improve plant aesthetics

To increase soil pH

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the 'P' in the NPK ratio represent?

Elemental phosphorus

Phosphorus pentoxide

Potassium

Potassium oxide

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a fertilizer with an NPK ratio of 33-10-5, what percentage of the product is nitrogen?

33%

5%

50%

10%

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How much phosphorus pentoxide is in a 40-pound bag with an NPK ratio of 33-10-5?

4 pounds

2 pounds

13.2 pounds

10 pounds

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the molecular weight of phosphorus pentoxide (P2O5)?

78 grams per mole

142 grams per mole

62 grams per mole

94 grams per mole

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What percentage of a P2O5 molecule is phosphorus?

44%

62%

83%

78%

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a 50-pound bag with an NPK ratio of 20-5-15, what is the percentage of filler?

40%

60%

20%

15%

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