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Soil Amendments Overview
GRIGG™ soil amendments are available in two different calcium and potassium formulations that are tailored to meet specific soil and environmental needs. Two additional GRIGG soil amendment products are formulated with zeolite, which is an effective tool for ncreasing cation exchange capacity (CEC) in soils.
Importance of Calcium as a Plant Nutrient
Calcium (Ca) is an essential secondary macronutrient. Functions of calcium within the plant include: increasing cell wall strength, improving cell membrane and osmotic functioning, which affects root extension. Calcium is also an important signal messenger when plant injury or pathogen infections occur, or when the plant is exposed to intense light and temperature conditions.
The process of calcium uptake by plant roots occurs as a divalent cation (Ca2+) and is considered a passive process. Once calcium has entered the plant, it is relatively immobile. Applied calcium to soil provides available Ca2+, alkalinity as lime (GRIGG™ C K–Balance™), or exchange with soil adsorbed sodium as gypsum (GRIGG™ S K–Balance™), thus increasing sodium leaching after irrigation or rainfall.
For these reasons, applying supplemental calcium in bio-available form is recommended in a combined soil and foliar nutrient management program. This ensures that an adequate supply of calcium is available to turfgrass. It is particularly important on turf that has high sand content in the root zone.
The Use of Zeolite as a Soil Amendment
GRIGG™ Z–mendit™ is a soil amendment that is formulated with a natural form of zeolite (clinoptilolite, a microporous tetrahedral arrangement of silica and alumina). Z–mendit is generally applied pre-plant, topically, or injected into high sand content root zones or unproductive soils with little organic material. When applied to turfgrass, the scientific benefits of Z-mendit include accelerated establishment, limited nutrient leaching, lower fertilizer requirements, improved turf vigor, and increased root development. When incorporated at the recommended rate of 10% by volume, Z–mendit provides a greater increase in soil CEC compared to competitive soil amendments.