Lecture 20

Question 1

Where do most essential elements come from?

Answer 1

Mineral and organ fractions of the soil.

Question 2

Macronutrients

Answer 2

Elements required in relatively large quantities

Question 3

Micronutrients

Answer 3

Elements required in small amounts.

Question 4

Nutrients deficiencies: Phosphorus

Answer 4

1. ) Stunted growth, limited root development

2. ) Purplish colouration of stems and leaves

Question 5

Nitrogen fertilizer

Answer 5

Manufactured using natural gas and elemental N,2, under high temperature and pressure to synthesize ammonia gas, NH3.

Question 6

Nutrient deficiency: potassium

Answer 6

1. ) Dull green leaves

2. ) Yellowing of leaves

Question 7

4R nutrient stewardship:

Answer 7

1. ) Right Source
2. ) Right Rate
3. ) Right Place
4. ) Right Time

Question 8

Right source

Answer 8

Match the fertilizer source and product to crop need and soil properties.

Question 9

Right rate

Answer 9

match the amount of fertilizer applied to crop need.

Question 10

Right place

Answer 10

Place and keep nutrients where crops can use them.

Question 11

Right time

Answer 11

Make nutrients available when the crop needs them.