Lecture 10

Question 1

Plant production

Answer 1

include both agricultural crops and forestry.

Question 2

Three sources of growth:

Answer 2

1. ) Anable land use expansion
2. ) Increases in cropping intensities (i.e., increasing multiple cropping and shorter fallow periods).
3. ) Yield growth.

Question 3

1.) Arable Land use Expansion

Answer 3

-Expansion of agricultural land is a major driver of deforestation in much of developed world.

Question 4

2.) Increases in cropping intensities

Answer 4

There is believed to be limited potential for further major expansions in this area.

Question 5

3.) Plant production systems and yield Increases

Answer 5

Most of the increases in crop production will have to come from yield increases.

Question 6

Plant production systems:

Answer 6

Production systems used must be sustainable if you want long-term increasing in crop production.

Question 7

1.) seed/seediling preparation

Answer 7

Pre-industrial PPS relied on naturally produced seeds and animals.

Question 8

2.) Site preparation

Answer 8

Extensive site preparation used in both agricultural and forestry PPS. Clearance of other species from land and preparation of seed bed through mechanical processes.

Question 9

3.) Planting

Answer 9

Site preparation and planting typically involve considerable disturbance of the soil.

Question 10

4.) growth:

A.) Nutrient/Mineral Inputs

Answer 10

The great majority of increases in crop production will have to come from higher yields, with a limited contribution from expansion In harvested area.
-N is a major source of environmental concern.