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If the soil pH is above 6, then use ammonium sulfate, which will acidify the soil. Turfgrass has been shown to be most resistant to summer patch when soil pH is between 5.5 and 6. Most balanced fertility programs for Kentucky Bluegrass lawns will consist of applying two to five lbs of nitrogen/1000 sq.ft. a year. [2]
Turf necrotic ring pathogen requires cooler temperatures. The temperatures of spring and fall are ideal for this pathogen, as they are cool to warm and damp. The pathogen also requires soils lower in nitrogen (2). Factors such as high soil pH and the correct level of moisture are critical for the development of this disease. So fertilizer and ...
Specific nutrient deficiencies (often aggravated by high soil pH) may be corrected by supplemental feedings of iron, in the form of a chelate or sulphate, magnesium or nitrogen compounds in various combinations. If the soil is too acidic, applying lime can raise the pH to the proper range, making more nutrients available to the plant.
If the soil pH is too high, plants are not able to absorb many micronutrients, such as manganese and iron. When soil pH is too low, plants cannot uptake macronutrients, such as nitrogen or phosphorus.
Iron deficiency can be avoided by choosing appropriate soil for the growing conditions (e.g., avoid growing acid loving plants on lime soils), or by adding well-rotted manure or compost. If iron deficit chlorosis is suspected then check the pH of the soil with an appropriate test kit or instrument. Take a soil sample at surface and at depth.
A recommended method to decrease soil pH is through the application of ammonium sulfate or ammonium phosphate fertilizer at around 4.5 kg (10 lb) per 9.3 m 2 (100 sq ft). Applications of fertilizer in this manner causes the soil pH to decrease making it less favorable to Texas root rot disease which prefers a more basic soil environment. [14]