Xtremehorticulture

Design and Installing Lawn Irrigation Not As Easy As It Looks

Q. We installed a lawn 18 months ago, but it has a difficult time during summer months. I aerate it, fertilize it and I know the drainage is good because the landscaper installed the system to our HOA requirements. I water twice daily, six days a week around 5 AM and 9 PM. There is a decent amount of shade and the yard faces south. Even the heavily shaded areas have problems. What can I do differently? Brown patches in lawns during hot summers will quickly show irrigation weaknesses. Notice these patches are also close to the patio where people walk. This area should probably be core aerified annually due to traffic. A. I looked at your pictures and the lawn looks good in most places except for a few small brown areas. Brown spots during summer months frequently point out weaknesses in the irrigation system. In your case the brown spots are also in front of the patio where there is alot of human traffic. Areas like this should be core aerified annually. Hollow tine aerifier             My first suspicion is the irrigation system and was not installed or maintained properly. Let’s cover the basic “must dos” when installing and maintaining an irrigation system. Water pressure The operating water pressure MUST be within the operating range of the sprinkler nozzles. Frequently this is 15– 30 psi. Some expensive sprinkler heads have built in pressure regulators, but lesser expensive ones may not. If the water pressure is too high, fogging or misting will occur out of the nozzle. If the sprinkler head is “fogging”, then brown spots will occur in weak areas. If pressure is too high, reduce it with a pressure regulator. If water pressure is too low, remove any pressure regulator, change it for the proper one or install a booster pump to increase the water pressure. Head to head coverage Water must be thrown from the nozzle far enough to reach neighboring sprinkler heads. Sprinkler heads must be installed at distances specified by the nozzles. These distances are meaningless if you don’t have the right water pressure. Sprinkler nozzles Sprinkler nozzles specify the operating pressure range, allowable spacing between sprinkler heads and precipitation rate in inches per hour among other things. These nozzles must be matched to each other. If someone maintains the irrigation system and replaces a nozzle with the wrong kind, it will produce brown spots in underwatered, weak areas.             Curved areas and re-curved areas of the lawn are the most difficult to water. There are adjustable nozzles that can be used but it will always be a weak irrigation area subject to brown spots.             Never water early at night like at 9 PM. If your lawn is healthy and it has a good irrigation system, one irrigation per day during summer is all that most lawns need IF the sprinkler system was designed and installed correctly. Irrigation should finish just before dawn. If you must water late in the day, apply water so that the grass leaf blades dry before it gets dark.             Don’t rake or catch the grass clippings when mowing. Most mowers now are “mulching mowers” with a special blade and deck design. Returning the clippings to the lawn substitutes for one fertilizer application each season.

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Are Organic Fertilizers Really Organic?

The organic movement has a foothold in the turfgrass and ornamental industry. The same industry brewing for decades in home vegetable gardens, and then with small-scale producers, has emerged as a significant market percentage for commercial landscapers. Homeowners are asking for “organic” landscape plants, organic methods of controlling pests and applications of “organic” fertilizer to their landscapes. Migration of Organics to the Landscape Industry             Alternative methods for producing and maintaining ornamentals and turfgrass have been around for a long, long time. In the past, very few residential clients were willing to pay for the additional costa associated with the product. That may be changing thanks to local food movements and organic agriculture1. The word “organic” has become synonymous with “wholesome” and “safe”. Organic fertilizers for vegetable gardens             Organic has a different meaning in landscape horticulture industry. Organic can mean sources that are not synthetic or conventional. Organic amendments, such as municipal and animal sources of biosolids, can be applied to improve soil physical and chemical properties which in turn can improve turfgrass establishment rates, growth, and quality. We know, for instance, that in poor or marginal soils the incorporation of compost improves soil properties, increases soil nutrients and consequently improves plant growth. In soils with a naturally higher percentage of organic matter these improvements are less noticeable. Nitroform urea used in the landscape industry could be classified as an “organic” fertilizer even though it is manufactured  Composted Dairy Manure Reduced Turfgrass Disease in Colorado             Research at Colorado State University evaluated the effects of applying composted dairy manure as topdressing to Kentucky bluegrass. Researchers applied compost at the rates of 13.3, 26.6 and 40 cubic yards to the acre. Applying composted manure as topdressing to established bluegrass in 2003 through 2004 improved the soil’s physical properties and nutrient content. EZ Green Is a composted chicken manure product for the landscape industry that is OMRI listed product for the organic program by USDA             Although nothing new, the application rates are important. The two higher rates improved turfgrass overall quality and allowed the grass to retain color in the fall, early winter and green up faster in the spring. Not bad for a product that is not considered a fertilizer.             During the hot summer months the two higher application rates produced about 50% more clippings. The researchers concluded that compost improves turf quality and shoot growth via its action as a slow-release fertilizer. Lawn clippings remove from the grass and left on the curbside for dumping in landfills. These clippings are filled with valuable nutrients that could be returned to the lawn resulting in one less fertilizer application each year.             More turfgrass clippings sound like a potential landscaper’s nightmare but there is a positive side to this “problem”.  Increased amounts of clippings in summer months helps suppress the incidence of hot weather diseases. Infected leaf blades are removed through regular mowing and mulched back into the turfgrass sward or removed from the property.             Disease suppression by composts, composted biosolids and compost teas in vegetable crops has been documented fairly well. But research has been conducted on the suppressive effects of composts, such as biosolids, on turfgrass diseases as well, dating back 20 years or more. Compost tea applicator used for soil applications             This research shows promise to “organic” gardeners by reducing the application of fungicides, synthetic fertilizers and other chemicals to home lawns. Composts show promise in controlling turf diseases such as Pythium, summer patch, brown spot, dollar spot, red thread, necrotic ring spot and others.  Reductions in the applications of pesticides such as fungicides, directly supports the “organic” movement whether it is truly organic or not. Lawn clippings from commercial properties represent a huge amount of fertilizer that is removed from the lawn grasses and buried in landfills. Composted Biosolids Benefits To Landscapes Shown by Texas Researchers             Researchers at Texas A and M University, from 2005 through 2008, demonstrated the benefits from composts used for soil improvement and nutrient enrichment can be transferred from the sod farm to newly established landscapes. Previous studies with sod that recycled manure-based soil amendments as topdressing indicates that 77% of the phosphorus and 47% of the nitrogen might be removed and transported in a single sod harvest.             About one quarter of the cubic yard of composted biosolids was incorporated to rootzone depth in a cubic yard of native soil when establishing Tifway bermudagrass sod. Researchers measured that five times more nitrogen and seven times more phosphorus was available to turfgrass grown in biosolids compared to grass grown without biosolids. Fertilizer content of composted biosolid product by a local Las Vegas supplier             After two sod harvests, all of the nitrogen and phosphorus applied from the biosolids was removed with the sod. These nutrients were transferred, with the sod, to the landscape.             Although not demonstrated, researchers claimed that this could result in faster establishment times and better turfgrass cover in a shorter period of time. This, of course, would reduce the amount of fertilizers needed during sod establishment. Another coup for the organic movement.             They also found that sod established with biosolids was lighter in weight than sod grown without biosolids. Biosolids-grown sod contained more water but less native soil than sod without biosolids. This helped preserve the native soil. Less fuel is needed for transporting the sod. Organics, are you listening? Composts Release Fertilizer Nutrients Slowly             Composts, when used as a fertilizer, releases nutrients slowly, acting like a slow-release fertilizer. When establishing turfgrass in sod farm operations, rapid turfgrass establishment is important so a rapid release of nutrients, particularly nitrogen, is needed.             This was not going to happen with compost-amended soils. So the researchers applied either 50 or 100 pounds of nitrogen per acre at the time of sprigging (establishment) to supplement the slowly-released nutrients contained in the compost.             Because of the application of supplemental nitrogen, the time between harvests in biosolids-amended soil plus fertilizer was reduced 60% compared to

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