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TURFGRASS SOILS REPORT 1982 Paul E Rieke Shawn L McBurney and Richard A Bay Department of Crop and Soil Sciences Michigan State University Effect of Soil pH on Turfgrasses A study on the effect of soil pH on three turfgrasses was established in August 1981 at the Hancock Turfgrass Research Center Ground limestone 1 5 3 0 and 6 0 tons per acre and sulfur 0 5 and 1 0 ton per acre applications were made and rototilled to a depth of 3 inches Three turfgrasses were seeded after treatment Baron Kentucky bluegrass Pennlawn red fescue and Manhattan perennial ryegrass Soil pH tests for samples taken 1 year after application are given in Table 1 The higher limestone rates raised pH to about 7 5 in the surface 2 inch layer while the sulfur treatments caused significant lowering of pH Some injury occurred on the Kentucky bluegrass and red fescue in the corner of one replication of the highest sulfur treatment No other injury to the grasses was apparent throughout the other plots The effects of pH on other soil tests for the check and the highest limestone and sulfur treatments are shown in Table 2 Although acidifying the soil increased the phosphorus tests the differences were not statistically significant Changing soil pH had no effect on the potassium test but did significantly reduce the available calcium and magnesium tests A greenhouse study was established with an undergraduate student Robert Maibusch in which 4 different particle size ranges of sulfur were mixed with a loam soil These materials were applied at 4 different rates Two months after application the soil was sampled for pH determination Soil pH values are given in Table 3 Clearly the finer particle size sulfur material was oxidized faster than the coarser material resulting in a faster pH reduction This is consistent with previous field observations that sulfur products composed of powdered or very finely ground sulfur react faster than more coarsely ground materials Because of the high surface area of the sulfur the sulfur oxidizing organisms convert the sulfur to sulfate much faster resulting in greater potential for turf injury Nitrogen Rate Effect on Penncross Penneagle and Emerald Creeping Bentgrass Greens Nitrogen rates ranging from 1 to 8 pounds nitrogen per 1000 square feet annually were applied to Emerald Penneagle and Penncross creeping bentgrass greens at the Hancock Turfgrass Research Center Generally the Emerald plots had lower ratings Table 4 than the other grasses during the growing season There was little difference in the quality ratings between Penncross and Penneagle 1 Table 1 Soil pH control study on sandy loam at the Hancock Turfgrass Center Treatments applied August 1981 Averages for 3 replications Samples taken August 1982 Research Treatment Rate tons A Chemical Depth of sampling 0 2 Limestone Limestone Limestone 6 0 3 0 1 5 7 5ax 7 6a 7 0ab 7 0ab 6 6bcc 6 1cd Check Sulfur Sulfur 0 5 1 0 6 0cd 4 1ef 3 4g 5 5d 4 6e 3 8fg inches 2 4 x means followed by the same letter are not significantly different each other at the 5 level using Duncan s Multiple Range Test Table 2 Soil pH control study on sandy loam at the Hancock Center Treatments applied August 1981 Sampled Averages for 3 replications Treatment Rate tons A Chemical Limestone 6 0 Check Sulfur x 1 0 Depth of sample Available pH P Turfgrass Research taken August 1982 nutrient K from test pounds A Ca Mg 0 2 2 4 7 5ax 7 0a 65 76 183ab 98c 2867a 1433b 638a 590a 0 2 2 4 6 0b 5 5b 86 104 188ab 123bc 1433b 1233b 268b 220b 0 2 2 4 3 4c 3 8c 125 132 206a 169ac 433c 700c 90c 77c means in columns followed by the same letter are not significantly different from each other at the 5 level using Duncan s Multiple Range Test 2 Table 3 S rate 1bs 1000 Effect of sulfur particle size and rate of pH on a loam soil seeded to Manhattan perennial ryegrass in the greenhouse Averages for 8 replications Samples taken 2 months after application Treatment Particle size 0 5 Depth of sample inches 5 1 1 2 2 3 3 4 4 5 mm 0 8 1 8 1 8 0 8 0 8 0 8 0 10 10 10 10 05 0 1 0 25 0 5 1 0 2 0 4 0 7 7 7 9 8 0 8 0 7 9 7 9 8 0 8 0 7 8 7 9 8 0 8 0 7 7 7 9 7 9 7 9 7 8 7 9 7 9 7 9 20 05 7 6 7 7 7 8 7 8 7 7 20 0 1 0 25 7 7 7 8 7 8 7 9 7 9 20 0 5 1 0 7 9 7 9 7 9 8 0 7 9 20 2 0 4 0 8 0 8 0 7 9 7 9 8 0 7 8 7 9 7 9 7 9 7 8 7 9 7 9 7 9 40 40 40 40 05 0 1 0 25 0 5 1 0 2 0 4 0 7 3 7 5 7 9 8 0 7 5 7 7 7 9 7 9 7 6 7 8 7 9 7 9 7 6 7 8 7 9 7 9 7 6 7 8 7 9 7 9 7 6 7 8 7 9 7 9 80 80 80 80 05 0 1 0 25 0 5 1 0 2 0 4 0 7 3 7 5 7 8 7 9 7 4 7 7 7 9 7 9 7 6 7 7 7 8 7 9 7 6 7 8 7 8 7 9 7 7 7 8 7 8 7 9 7 7 7 8 7 9 7 9 3 Table 4 Effect of nitrogen rate on quality of Penncross Penneagle and Emerald creeping bentgrass putting greens at the Hancock Turfgrass Research Center Treatments initiated in 1982 Plot size is 3 feet by 6 feet Three replications All plots receive 2 pounds K 0 per 1000 2 square feet annually Turfgrass Annual N rate lbs 1000 sq ft Nov 2 Dec 15 Urea Urea Urea Urea Urea Urea Emerald Emerald Emerald Emerald Emerald Emerald 3 7hY 4 5gh 4 5gh 5 2fg 5 5dg 5 7dg 1 7i 3 7gh 4 0fh 4 7ef 4 7ef 4 7ef Urea Milorganite Ammonium nitrate Emerald Emerald Emerald 5 3eg 3 7h 4 8fh 8 8a 5 7cd 3 7gh 1 2 3 4 6 8 Urea Urea Urea Urea Urea Urea Penneagle Penneagle Penneagle Penneagle Penneagle Penneagle 6 0cf 7 2ac 7 2ac 7 8ab 7 8ab 8 0a 3 3h 4 0fh 4 2fh 5 3ce 5 7cd 5 8c 4Lx 4L 4 Urea Milorganite Ammonium nitrate Penneagle Penneagle Penneagle 7 0ac 6 0cf 7 2ac 7 3b 5 8c 4 8df 1 2 3 4 6 8 Urea Urea Urea Urea Urea Urea Penncross Penncross Penncross Penncross Penncross Penncross 5 3eg 6 7bd 6 7bd 7 2ac 8 0a 8 2a 4 …


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