enh 125

• The pH of water can affect nutrient availibility.     a. true
• When testing water for electrical conductivity, what is the prefered ec?below 1.5 dS/m in general
•  water cost is not a big factor in the US true
• What does electrical conductivity (Ec) measure?  Soluble Salts
• What is typically seek pH values for the water in the root zone?     a. between 5.4 and 6.9
• What is the preferred EC (dS/m) in your greenhouse water <0.50
• What is the pH of water? 7
• What is a common consequence of high salinity in irrigation water? Reduced plant growth
• What are concerns related to water quality?

  pH of water     b. alkalinity of water     c. source of water     d. hardness
• What is the recommended electrical conductivity for general use (in dS/m) Below 1.5
• Alkaline and alkalinity refer to the same thing?fasle
•  Which of the following is an acceptable value for the pH of the water in the root zone? 6.2
• what level of hazard is an EC of 2-3  high
• If the pH of water changes from 6 to 5, how much does the concentration of hydrogen ions (H+) in the water change?

  10x
• What are the design criteria of an irrigation system? Consistent water temperature     b. Steady availability of water, System capacity
•  Which of the following is not an irrigation system?  rain
• In the past, it would be common to over irrigate by 10-20% more to: Prevent salt build up
• What does underwatering cause?  Retardation of photosynthesis and cell elongation     b. short stems     c. damage to young tissue     d. wilting
• Which of the following is not common irrigation system infrared system
• What is one type of irrigation system? Hand-watering
• The moisture tension in your plants should be below 5kPa. true
•  Which of the following are categorized as overhead irrigation systems (above foliage)? Sprinkler Systems     b. Mist and Fog Systems     c. Boom Systems
• What is the key advantage of using drip irrigation system in a greenhouse? it maximizes water use efficiency by delivering water directly to plant roots
• At what water tension should you let a substrate reach before re-watering? 5 KPa
• The coefficient of uniformity is used to measure the uniformity of irrigation systems. true
• What difficulty do we see in irrigation? frequently conflciting situations between water, nutrients, and oxygen
• What is the recommended pipe diameter to maintain pressure above 30 psi in an on-site distribution system for an irrigation setup to achieve ideal uniformity?  2-inch diameter pipe
• What is the purpose of filters in irrigation systems? to prevent clogs in pipes and emitters
• Which is not an irrigation rule? Lift up pots to see if water fully drained each week
• Which irrigation scheduling technique relies on measuring soil moisture levels to determine when to apply water to crops?   Soil moisture-based scheduling
• What is not a type of irrigation? fog
• Which is NOT an irrigation rule?

   Only use water with a pH of exactly 7
• Which of these is an on-site distribution irrigation system? Injection system
• Large irrigation pipes have more friction and therefore less irrigation uniformity. false
• What changes do plants undergo underwatering?

  shorter stems,  stunted growth     d. damage to young tissue
• which of the following is NOT a purpose that irrigstion serves?  stabize root structure
• select all the irrigation methods uses within the greenhouse Capillary Mat     b. Drip irigation     c. Boom system     d. Hand watering     e. Mist and Fog syste
•  What is not a rule of irrigation? If your plants do become water stressed make sure to apply diluted fertilizer to add more water into the medium
•  what moisture tension in kPa is comfortable for plants? 1-5 kpa
• What are the characteristics of hand watering as an irrigation system? It is not suitable for containers with limited space above the root zone.