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24 Cards in this Set
- Front
- Back
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Give 5 things to check when determining if your plants need water |
- moisture level at the soil surface (should be slightly dry between waterings) - the weight of the plant and container (pick it up) - the location in the GH (hot or cold spot) - type of plant (cacti, succulent...) - type of container (clay or plastic, small or large) - soil type - the stage of growth (is it dormant, or is it in a growth spurt?) |
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Should you water plants at the base , or give them a shower? |
at the base. some plants do not like getting their leaves wet (i.e. african violet, maiden hair fern, asparagus fern...) |
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what does a tensiometer or moisture meter measure? |
measures moisture at the root zone (refer to page 56 for tensiometer function) |
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What type of GH would you use a tensiometer in? |
a GH with ground beds containing natural soil. |
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True or False? A tensiometer is left in place for the season. |
True! |
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The tensiometer or moisture meter may be affected by _______ and may need to be soaked in _________ |
- salt build up - Distilled water |
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for a trickle watering system, a _______ may be required for water supply from municipal system, or from a private water system (well). |
regulation valve (pressure reducing valve) |
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a diluter is used in a fertigation system. What is its function? |
dilutes the stock solution (liquid fertilizer concentrate) to produce a working solution (adds water to the concentrate) |
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filters must be used in a trickle tube system because __________ |
tubes are easily clogged |
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end cap or valve is necessary in a trickle tube system because ____________ |
may be necessary to flush likes (they are easily clogged) |
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True or False? Spaghetti tubes should be installed at different lengths. |
False! All spaghetti tubes must be the same length |
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in what situation would a trickle system not be a good irrigation system for a GH? |
- if there are a variety of plants with different watering/fertilizing needs - if the plants are in small pots that lack the space to hold an emitter |
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the micro tube length determines ________ |
the water flow |
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what type of system is often used for watering and fertilizing large scale monoculture GHs? |
a travelling boom sprayer |
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where would you use a soaker /ooze hose ? |
in a ground bed (natural soil) |
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how does a soaker / ooze hose work? |
water bleeds out through porous material (hose is made of mesh, or is rubber/plastic with tiny perforations) |
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a soaker hose may give uneven spray, but what type of soil action will even out the water content ? |
capillary action |
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what material is used create a capillary mat? |
- sand - fibre mat (refer to page 62 for capillary mat function) |
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give 2 examples of when to use capillary mat irrigation/fertigation |
- for plants that do not like wet leaves - for containers that are too small for trickle/drip system - for short term crops |
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give 3 disadvantages of using a capillary mat for irrigation/fertigation |
- possible algae growth on surface of mat - can't leach out salts - crop may root into mat over time - good for short term crops only |
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give disadvantage of ebb and flood system |
- if not UV treated, the recycled solution can spread pathogens |
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you should irrigate enough to allow for ______ |
leaching each time make sure that some water comes out the bottom of the pot |
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most domestic water contains _______ which can be detrimental to plants |
chlorine |
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explain how a tensiometer works |
as the soil becomes dry, water is pulled out of the tensiometer. this creates a measurable vacuum |
