NPK fertilizers are on every garden store's shelves, and they're often essential for plants' health. But what does NPK stand ...

Phosphorus is an essential soil nutrient plants need to thrive. Phosphorus is a vital mineral for healthy plant growth. Unlike carbon dioxide or oxygen, which plants receive from the air, plants ...

Phosphorus (P) is a key plant nutrient. Only nitrogen and potassium are required in higher amounts by crops. High soil test phosphorus fields are a looming environmental threat to surface water.

Very dry conditions, like those seen in most of Arkansas this fall, impact two aspects of soil sampling that make it hard to measure how much phosphorus and potassium are in a field. Arkansas ...