Fertilizer can be 'green'

The impact that phosphorus - a common component of lawn fertilizer - has on the environment is drawing a lot of attention as summer approaches. Phosphorus from fertilizer can leach into lakes and streams, contributing to excessive algae and water plant growth that harms fish and impedes recreational use of these waters.

Urban areas have many sources of phosphorus, including lawn fertilizer, leaves, other organic yard waste and pet droppings. Regulators have targeted lawn fertilizers as a primary source of interest.

Phosphorus is essential to sustain life. It plays a key role in how living creatures use energy from food to power growth and reproduce. Limiting phosphorus limits growth and reproduction. Eliminating phosphorus from the environment eliminates life.

Not all sources of fertilizer phosphorus are the same. The water extractable phosphorus test, or WEP test, is a new way to show how easily phosphorus in a particular fertilizer moves into groundwater. A low WEP means that phosphorus will stay out of groundwater. A high WEP means that movement is likely. Phosphorus in groundwater may move to surface water and cause excessive water plant growth.

Synthetic fertilizers, the traditional kind used to manufacture common lawn fertilizer, contain more than 85 percent water extractable phosphorus. If these fertilizers are overapplied, some of this phosphorus may enter groundwater and move to bodies of water.

Fertilizers such as Milorganite 5-2-0 contains less than 2 percent water extractable phosphorus, making them better choices for the environment.

Milorganite fertilizers contain high amounts of iron. This iron combines with phosphorus, holding it away from soil water until plants can use it. Thus, lawns still have an adequate supply of phosphorus to grow and repair themselves from damage by mowing and playing. However, this phosphorus does not move to groundwater. Leaves and grass clippings contain phosphorus. Keep them out of curbs and from washing into storm sewers. Recycle their nutrients and organic matter back to your plants by mulching them. If you are mowing near open water, point mower discharges to land. When you spread any fertilizer, blow or sweep it off drives and walks back onto your lawn.

Finally, pick up pet droppings and place them in the trash. These droppings contain high amounts of phosphorus. Dropping them into storm sewers is like dropping fertilizer pellets onto open water.

For more information regarding eco-friendly fertilizer, visit www.milorganite.com or call (800) 304-6204.

Courtesy of ARAcontent