Iha Education April Webinar - Sun Gro Nutrition & Fertilization Made Easy

Explanation
To design a fertilization program for a greenhouse grower, the most important piece of information needed is a complete water analysis. This analysis provides crucial information about the composition and quality of the water being used for irrigation. It helps determine the levels of various elements and minerals present in the water, which can affect the nutrient balance in the soil. By knowing the water's composition, the grower can make informed decisions about the types and amounts of fertilizers to use, ensuring optimal plant growth and health.

Explanation
Alkalinity is the correct answer because it refers to the measurement that tells us a particular water's ability to change the pH of a medium. It indicates the water's capacity to neutralize acids and maintain a stable pH level. Temperature, salinity, and turbidity are not related to the water's ability to change medium pH.

Explanation
When the pH of the medium is high, it can result in a deficiency of iron in plants. This is because iron becomes less available to plants in alkaline conditions. Iron is an essential nutrient for plants and is required for the synthesis of chlorophyll. When there is a lack of iron, the newer growth of the plant may exhibit interveinal chlorosis, which is the yellowing of the tissue between the veins while the veins remain green.

Explanation
The substance in limestone that causes a soil or a growing medium to increase pH is carbonate/bicarbonate. Limestone is primarily composed of calcium carbonate, which reacts with water and releases carbonate and bicarbonate ions. These ions increase the alkalinity of the soil or growing medium, raising the pH level.

Explanation
The term "potential acidity / basicity" is used to describe a fertilizer's ability to change pH. This refers to the fertilizer's capacity to either increase (acidity) or decrease (basicity) the pH level of the soil it is applied to. The pH level of the soil plays a crucial role in determining the availability of nutrients to plants, so understanding a fertilizer's potential acidity or basicity is important in determining its suitability for specific soil conditions.

Explanation
The fertilizer formulations 20-10-20 and 20-20-20 are generally regarded as acid-forming and can decrease the medium pH.

Explanation
All of the above options can be used to help easily measure and injectors accuracy. A solu-bridge is a device that measures the conductivity of a solution, which can be used to determine the accuracy of an injector. Similarly, a conductivity meter and an EC (electrical conductivity) meter are also used to measure the conductivity of a solution, indicating the accuracy of an injector. Therefore, all three options are valid choices for measuring and ensuring the accuracy of injectors.

Explanation
Geranium plants are notorious for showing iron/manganese toxicities in the greenhouse. This means that when these plants are grown in a greenhouse environment, they are more prone to experiencing toxicity issues related to iron and manganese. These toxicities can negatively affect the health and growth of geranium plants, potentially leading to stunted growth, leaf discoloration, and other detrimental effects. Therefore, it is important for greenhouse growers to carefully monitor and manage the levels of iron and manganese in the soil and provide appropriate treatments to prevent these toxicities in geranium plants.