Propagation/Greenhouse Management
36 | Unit 1.3
Assessment Questions Key
- Aeration. Constituents that impart this
quality: Perlite, sand, soil, leaf mould,
gravels and lava rock, and to a lesser extent,
vermiculite compost, peat moss and coir fiber - Density. Constituents that impart this quality:
Sand, soil, gravel, compost, and leaf mould - Nutrient availability. Constituents that
impart this quality: Compost, soil, mineral
and organic matter amendments, and leaf
mould - Water-holding capacity. Constituents that
impart this quality: Compost, peat moss and
coir fiber, vermiculite
- What pieces of information are commonly
documented in the propagation process and
why?
- Genus and species of crop
- Variety of crop
- Date sown
- Date pricked out (if applicable)
- Seed company name
- Seed lot (year seed was produced for)
Why: The above would provide adequate
information for future trouble shooting and
the selection of crops during variety trials
- What is the “hardening off” process?
The gradual exposure and acclimation
of greenhouse-raised transplants to the
environmental conditions of the field.
- List two characteristics of cell-tray-grown
seedlings at transplanting maturity.
- Second set of true leaves initiated
- Root knit
- List two necessary steps for preparing
seedlings before transplanting them to the
field or garden.
- Pre-moistened to 75% field capacity
- Hardened-off for 3–21 days
10) List the environmental conditions most
favorable for the successful bare-root
transplanting/ pricking out seedlings grown
in a flat format.- Low light levels
- Low temperatures
- Low wind velocity
11) Describe four preventive measures and two
active measures used to control fungal plant
pathogens in greenhouse facilities.
Preventive measures:- Proper sanitation of propagation media,
facilities, and containers - The selection and use of disease-resistant
varieties - The selection and use of climate-appropriate
varieties - The use of disease-free seed stock
- Management of environmental conditions
of greenhouse (air circulation, temperature,
light) and propagation media (moisture,
aeration, nutrients) within the optimal range.
Good cultural practices. - Monitoring
Active measures: - Roguing affected crops
- Biological control
- The use of acceptable chemical controls