Soil surface rock fragments

Soil analysis is conducted on the fine fraction, or the soil that passes through a 2 mm sieve. Surface rock fragment class is the mineral material that does not pass through the sieve; it is normally recorded on a volumetric basis. The amount of rock fragments affects soil properties such as the amount of available water and nutrients, the rate at which soil temperature changes, the originating soil parent material, the history of the soil and may dictate management practices. In truffle orchards, rock fragments can cause irregularly shaped truffles and lower truffle quality.

Soil and plant testing for truffle cultivation in North America by Shannon M. Berch and Mark Coleman

Purpose of this document
Part 1: Soil testing for truffle cultivation
Part 2: Plant nutrition tests for truffle cultivation
Part 3: Interpretation of soil and plant tests
Appendix 1: Calculating plant leaf nutrient concentrations in proportion to N concentration
Appendix 2: Units and conversions back to a standard with which recommendations are made
Literature references

Thinking about truffle cultivation? Things to consider – Shannon Berch and Inga Meadows

The aim of this document is to briefly highlight factors/elements/challenges/issues to consider if you are thinking of getting into truffle cultivation. NATGA’s mission is to promote awareness, growth, and development of the truffle industry in North America by researching best practices in all aspects of the industry and sharing information between growers. NATGA aims to provide more detailed guidance as it becomes available.