Summary: Applying liquid lawn fertilizer can assist in building stronger grass and a better lawn. However, as easy as using liquid fertilizer is and the quick results it can produce, it is important to use liquid lawn fertilizer at the proper times on the year.
Lawn grasses must grow vigorously to crowd out weeds and maintain a solid turf. They make their best growth from applied fertilizer if the soil on which they are growing contains a good supply of lime, preferably magnesium limestone.
Liquid fertilizers lend themselves to application by sprays, using regular equipment for spraying or by using fertilizer attachments which are placed between the faucet and the hose when sprinkling or irrigating. These attachments suck in small quantities from a container and no mixing is necessary. They apply the plant food gradually giving the grass an opportunity to absorb some of the plant food through the leaves.
If such equipment is not available a sprinkling can may be used. For this purpose it is necessary to dilute the liquid fertilizer with water so one pound covers 1000 square feet. In other words, an area 25 X 40 feet needs one pound or one pint of 5-10-5 or its equivalent in some other mixture.
If you buy a liquid which has a 5-10-5, 6-12-6, or 7-14-7 ratio, one pint is equal to one pound of dry material. If you use a higher analysis, which may be several times as strong as 5-10-5, you must use it in proportionate amounts.
Liquid fertilizers should be applied after the first flush of grass has been mowed. During July and August, no fertilizer should be applied. Then about September 1 and October 1, fertilizer should be given to build up grass which will withstand winter conditions.
By following this method, you avoid the rapid succulent growth which often develops when you apply fertilizer in early spring. Growth is more uniform and grass plants have strong healthy crowns that can withstand crowding from weeds and maintain a good cover to prevent crabgrass seed from germinating.