PDC Soil Health & Regeneration Techniques 2

Question 1

Which soil organism is primarily responsible for forming stable soil aggregates by producing glomalin?

Accepted Answer

Mycorrhizal fungi

Answer

Mycorrhizal fungi produce glomalin, a glycoprotein that glues soil particles into stable aggregates improving structure and water retention.

Question 2

In a permaculture sheet mulch system, what is the purpose of the cardboard or newspaper layer placed directly on grass?

Accepted Answer

To smother existing vegetation and block light

Answer

The cardboard or newspaper layer smothers existing vegetation by blocking light and oxygen, suppressing weeds while decomposing into organic matter.

Question 3

What does a Brix reading measure in the context of soil and plant health?

Accepted Answer

Dissolved solids including sugars in plant sap

Answer

A Brix refractometer measures dissolved solids (primarily sugars and minerals) in plant sap, serving as an indicator of plant nutrient density and soil fertility.

Question 4

Which cover crop is most effective at breaking compaction with its deep taproot?

Accepted Answer

Daikon radish

Answer

Daikon radish develops a deep, thick taproot that physically breaks through compacted soil layers, leaving channels for water and air when it decomposes.

Question 5

What is the primary role of the 'fungal to bacterial ratio' (F:B ratio) in soil assessment?

Accepted Answer

It indicates whether soil food web favors perennial or annual plant communities

Answer

The F:B ratio indicates ecosystem successional stage — high fungal ratios support perennials and forests, while bacterial-dominated soils favor annuals and disturbed land.

(PDC) Permaculture Design Certification Practice Test

(PDC) Permaculture Design Certification Practice Test

PDC Soil Health & Regeneration Techniques 2