Nutrition
The below table lists resources that growers may find helpful:
Title/Link | Description/Type | Tags |
---|---|---|
Extension Article | #uk #extension | |
Extension Article | #uk #extension | |
PourThru Method – Containerized Perennials (CEH-3-IG) | Extension Article | #uk #extension |
Extension Article | #uk #extension | |
Soilless Substrate Sampling (CEH-5-IG) | Extension Article | #uk #extension |
Plant Leaf Tissue Sampling (CEH-6-IG) | Extension Article | #uk #extension |
PourThru Method for Large Containerized Crops | e-GRO Article | #egro |
Jar Test: Determining Fertilizer Solubility and Compatibility |
e-GRO Article | #egro |
e-GRO Article | #egro |
Ornamentals
Coleus Nutritional Disorder Guide
This e-GRO Alert provides a photographic guide to coleus nutritional disorders.
Fuchsia are often produced in hanging baskets to showcase their ornate and intricate flowers. High substrate pH will induce upper leaf interveinal chlorosis. However, an observed, but not reported, reddish-purple interveinal chlorosis occurs on lower leaves as a result of low pH induced micronutrient toxicity of iron (Fe).
Gerbera: Diagnosing Interveinal Chlorosis of Upper Leaves
Upper leaf interveinal chlorosis (yellowing) of gerbera (Gerbera jamesonii) is an indicator of iron (Fe) deficiency and may be a result of waterlogged substrates, high substrate pH, or underdeveloped root system.
Water-soluble and Controlled-release Fertilization
Controlled-release fertilizers (CRF) are coated with a substance (often a resin, wax, sulfur, or polymer) that prevents the nutrients it contains from being immediately available to the plant — the result is that nutrients are released over an extended period. Depending on the brand of CRF the release rate (and thus its longevity) is subject to temperature, substrate moisture level, and the type and thickness of the coating.
Food Crops
Fertilizer Calculation Basics for Hydroponics
While the math itself is pretty straightforward, there are several key points to take into account, including: percent elemental composition of a fertilizer, injector ratios, size of stock tank, and compatibility of fertilizer salts in stock tanks. This alert will cover the basics of fertilizer calculations.
Fine tuning nutrient replenishment in hydroponics
This eGRO Edibles Alert provides a real world scenario where maintaining a target solution EC resulted in nutrient deficiency. We will also discuss a method for designing replenishment solutions that minimizes the risk of nutritional problems and the need to periodically dump and replace solution.
Magnesium Deficiency of Hydroponic and Container Grown Basil
Basil (Ocimumbasilicum) is the most commonly grown greenhouse herb crop. Basil is sensitive to magnesium deficiency. Visual symptoms of magnesium deficiency appear first on old and recently mature leaves as a slight interveinal chlorosis (yellowing). This article will cover the progression of visual symptoms of magnesium deficiency, common causes of the deficiency, target leaf tissue elemental magnesium, and corrective actions for both hydroponic and container grown plants.
Managing micronutrients in hydroponic culture
Managing micronutrients in hydroponic production systems with recirculating nutrient solutions requires a different approach than managing them compared to containerize crops.
Nutrient Antagonisms - The Potassium-Calcium-Magnesium Relationship
Managing mineral nutrition for hydroponically grown crops is essential for maximizing crop productivity and quality. Deficiency symptoms can occur when there are insufficient nutrient concentrations in solution. However, it is also possible to observe deficiency symptoms even when there is a sufficient concentration in the nutrient solution due to nutrient antagonisms. This e-GRO Edible Alert is going to focus on the relationship between potassium (K), calcium (Ca), and magnesium (Mg).
Potassium Deficiency of Greenhouse Cucumbers
Potassium deficiency of greenhouse cucumbers may be initially observed as chlorosis (yellowing) of the older lower leaf margins. As symptoms progress, interveinal chlorosis and firing (necrosis) of the leaf margin and interveinal regions will develop while the leaf midrib and veins remain green.
Test & Adjust Nutrients in Hydroponics
In hydroponic systems, we supply nutrients in forms that are available to the crop. Plants respond rapidly to good and bad fertilizer choices. Therefore, we need to use precision in applying the fertilizers to sustain crop yields and quality. In this e-Gro Edible Alert, I will discuss sampling and how to use the results of testing to adjust nutrient programs.
Yellow Shoulder: A Ripening Disorder of Greenhouse Tomato Fruit
Yellow shoulder/green shoulder is a physiological disorder that is not well understood. The disorder is prevalent in greenhouse / high tunnel tomato production and can also be found under field conditions. This article will discuss causes of yellow shoulder and cultural management steps that can be taken to reduce its prevalence.