![]() ![]() The image below shows the strongest held elements to the weakest held elements on cation exchange sites on clay particles. The binding strength of elements to these exchange sites varies depending on the type of element and its electrical charge ( +1, +2, etc.). Since the potassium ratio is high compared to the hydrogen (H +, or acid ions) on the peat, some of the hydrogen is exchanged for potassium (these elements are in red). The potassium nitrate dissociates into individual elements shown in green. The same peat particle as seen in Figure 1, with potassium nitrate fertilizer added. The number of elements retained as seen in this picture represents the cation exchange capacity of this peat particle.įigure 2. The peat particle pictured has negative charges that have cations attached to these sites. In comparison, the cation exchange capacity is more significant in a soilless media than the anion exchange capacity.įigure 1. These positive sites contribute to the anion exchange capacity of the growing medium. ![]() Soils and soilless media particles can also have positive charges which attract negatively charged particles. Positive Charge of Soil and Soilless Growing Media The more negatively charged sites on these particles, the higher the cation exchange capacity of the growing medium. Positively charged elements (cations) bind to these negative sites on the media particles and later can be exchanged for another element used by the plant. If there is a negative charge on the surface of a growing medium particle, it contributes to the cation exchange capacity. Soil and soilless media particles (peat moss, vermiculite, bark, coir, calcined clay, etc.) have electrical charges on their surfaces. Negative Charge of Soil and Soilless Growing Media Because of these charges, they can be electrically bound to soilless media particles. When fertilizer elements dissociate in water, they are classified as either cations or anions. In the case of organic fertilizer, the same rules apply microbes break down complex molecules into the same individual fertilizer elements as seen in Figure 1. ![]() Calcium has a positive charge, or cation, and nitrate has a negative charge, or anion.įigure 1 shows all plant elements and their charges. For example, calcium nitrate (a salt) dissociates in the water into calcium and nitrate: Ca(NO 3) 2 + water = Ca ++ + 2 NO 3-īoth calcium and nitrate have an electrical charge. When mixed with water, these salts break apart, leaving individually charged nutrients. Conventional fertilizer comes in the form of salts. To understand what CEC is, we need to review a little chemistry. Understanding Cation-Exchange Capacity (CEC) So, what is CEC?ĬEC is an acronym for “cation exchange capacity” and refers to a soilless medium or soil’s capacity to hold and exchange mineral nutrients. In this article, we will talk about CEC, what it means, and its importance. We occasionally receive questions about CEC or the nutrient retention properties of our PRO-MIX products. However, your healthcare provider may have more information concerning specific programs available in your area.Back What is CEC and Why Is It Important? No Patient Assistance Programs were found for this medication. Patient assistance programs (PAPs) are typically sponsored by pharmaceutical companies and offer cost-free or discounted medicines,Īs well as copay programs, to individuals with low income or those who are uninsured/under-insured and meet specific criteria.Įligibility requirements for each program may vary. Patient Assistance & Copay Programs for Atorvastatin No manufacturer promotions could be found for this medication. Target, WalMart Pharmacy, Duane Reade and 65,000 pharmacies nationwide. Valid at all major chains including Walgreens, CVS Pharmacy, Note: This is a drug discount program, not an insurance plan. Over-the-counter drugs and pet prescriptions. The free Discount Card works like a coupon and can save you up to 80% or more off the cost of prescription medicines, ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |