The Experts below are selected from a list of 4536 Experts worldwide ranked by ideXlab platform

Ellen R Mcdonald - One of the best experts on this subject based on the ideXlab platform.

  • cultural and chemical controls of thatch and their influence on rootzone nutrients in a bentgrass green
    Crop Science, 1998
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation is a serious problem in densely grown turfgrass maintained under low mowing heights. Opinions differ concerning effectiveness of cultural and chemical controls of thatch. The objectives of these studies were to determine the effectiveness of mechanical and chemical treatments in controlling thatch and their influence on soil nutrient retention and pH in a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (VM 4 and 8x/yr), coring (core 4x/yr), wetting agent (Wet Ag 7x/ yr), extra K (4x/yr), lime (L 4x/yr) and various combinations, and interactions of these with topdressing (Tpd 3 and 6x/yr). Rootzone nutrients determined were Ca, K, and P and rootzone pH levels were determined. Thatch measurements were determined with a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. Lowest non-significant levels of thatch resulted following VM 4x or 8x/yr and VM + coring. Tpd 3x or 6x/yr also effectively prevented thatch buildup. When combining mechanical and chemical methods with Tpd, lowest non-significant levels of thatch resulted following VM 4x or 8x/yr, VM + coring, and VM + L, all combined with Tpd 6x/yr. Extra K (VM + K + L, K + L, K) and Wet Ag resulted in increased thatch. Lime did not influence thatch depth. Loss of rootzone K was 94% and increased with mechanical and chemical treatments. Loss of rootzone P was 86% but extra K and L treatments reduced P loss, especially under pH 7.3 following L treatments. Loss of rootzone Ca was 56% but Land extra K treatments under pH 7.3 reduced this loss.

  • comparative methods of measuring thatch on a creeping bentgrass green
    Crop Science, 1997
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation continues to be a serious problem in densely grown close mowed turfgrass. Several methods are used to measure thatch, ranging from very rapid to very slow, with opinions differing concerning the reliability of the various methods. The objectives of these studies were to evaluate speed of use, precision, reliability, and the practicalities of two of the most commonly used methods of measuring thatch, which are slow, with those of a very rapid method. All three methods were evaluated as part of a field study to determine the effectiveness of mechanical and chemical treatments in controlling thatch on a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (4 and 8x/yr), coring (4x/yr), wetting agent (7x/yr), extra K (4x/yr), lime (4x/yr), and various combinations of these; and interactions of these with topdressing (3 and 6x/yr). Thatch measuring methods used were the ruler, total organic matter (OM) by loss-on-ignition, and a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. The thatchmeter was easy to use, enabling a set of six readings per sub-plot to be made much faster than one core sample could be cut and measured with a ruler. The OM method was tediously slow, taking days to complete, and measured only total OM by weight with no determination for depth. As a method relating to thatch depth, the thatchmeter and ruler methods correlated well with each other with the thatchmeter being more sensitive. The OM method did not correlate with either the thatchmeter or ruler. Based on data from this study, the thatchmeter appears to be the most reliable and practical of the three methods tested.

Lloyd M Callahan - One of the best experts on this subject based on the ideXlab platform.

  • cultural and chemical controls of thatch and their influence on rootzone nutrients in a bentgrass green
    Crop Science, 1998
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation is a serious problem in densely grown turfgrass maintained under low mowing heights. Opinions differ concerning effectiveness of cultural and chemical controls of thatch. The objectives of these studies were to determine the effectiveness of mechanical and chemical treatments in controlling thatch and their influence on soil nutrient retention and pH in a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (VM 4 and 8x/yr), coring (core 4x/yr), wetting agent (Wet Ag 7x/ yr), extra K (4x/yr), lime (L 4x/yr) and various combinations, and interactions of these with topdressing (Tpd 3 and 6x/yr). Rootzone nutrients determined were Ca, K, and P and rootzone pH levels were determined. Thatch measurements were determined with a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. Lowest non-significant levels of thatch resulted following VM 4x or 8x/yr and VM + coring. Tpd 3x or 6x/yr also effectively prevented thatch buildup. When combining mechanical and chemical methods with Tpd, lowest non-significant levels of thatch resulted following VM 4x or 8x/yr, VM + coring, and VM + L, all combined with Tpd 6x/yr. Extra K (VM + K + L, K + L, K) and Wet Ag resulted in increased thatch. Lime did not influence thatch depth. Loss of rootzone K was 94% and increased with mechanical and chemical treatments. Loss of rootzone P was 86% but extra K and L treatments reduced P loss, especially under pH 7.3 following L treatments. Loss of rootzone Ca was 56% but Land extra K treatments under pH 7.3 reduced this loss.

  • comparative methods of measuring thatch on a creeping bentgrass green
    Crop Science, 1997
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation continues to be a serious problem in densely grown close mowed turfgrass. Several methods are used to measure thatch, ranging from very rapid to very slow, with opinions differing concerning the reliability of the various methods. The objectives of these studies were to evaluate speed of use, precision, reliability, and the practicalities of two of the most commonly used methods of measuring thatch, which are slow, with those of a very rapid method. All three methods were evaluated as part of a field study to determine the effectiveness of mechanical and chemical treatments in controlling thatch on a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (4 and 8x/yr), coring (4x/yr), wetting agent (7x/yr), extra K (4x/yr), lime (4x/yr), and various combinations of these; and interactions of these with topdressing (3 and 6x/yr). Thatch measuring methods used were the ruler, total organic matter (OM) by loss-on-ignition, and a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. The thatchmeter was easy to use, enabling a set of six readings per sub-plot to be made much faster than one core sample could be cut and measured with a ruler. The OM method was tediously slow, taking days to complete, and measured only total OM by weight with no determination for depth. As a method relating to thatch depth, the thatchmeter and ruler methods correlated well with each other with the thatchmeter being more sensitive. The OM method did not correlate with either the thatchmeter or ruler. Based on data from this study, the thatchmeter appears to be the most reliable and practical of the three methods tested.

William L Sanders - One of the best experts on this subject based on the ideXlab platform.

  • cultural and chemical controls of thatch and their influence on rootzone nutrients in a bentgrass green
    Crop Science, 1998
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation is a serious problem in densely grown turfgrass maintained under low mowing heights. Opinions differ concerning effectiveness of cultural and chemical controls of thatch. The objectives of these studies were to determine the effectiveness of mechanical and chemical treatments in controlling thatch and their influence on soil nutrient retention and pH in a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (VM 4 and 8x/yr), coring (core 4x/yr), wetting agent (Wet Ag 7x/ yr), extra K (4x/yr), lime (L 4x/yr) and various combinations, and interactions of these with topdressing (Tpd 3 and 6x/yr). Rootzone nutrients determined were Ca, K, and P and rootzone pH levels were determined. Thatch measurements were determined with a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. Lowest non-significant levels of thatch resulted following VM 4x or 8x/yr and VM + coring. Tpd 3x or 6x/yr also effectively prevented thatch buildup. When combining mechanical and chemical methods with Tpd, lowest non-significant levels of thatch resulted following VM 4x or 8x/yr, VM + coring, and VM + L, all combined with Tpd 6x/yr. Extra K (VM + K + L, K + L, K) and Wet Ag resulted in increased thatch. Lime did not influence thatch depth. Loss of rootzone K was 94% and increased with mechanical and chemical treatments. Loss of rootzone P was 86% but extra K and L treatments reduced P loss, especially under pH 7.3 following L treatments. Loss of rootzone Ca was 56% but Land extra K treatments under pH 7.3 reduced this loss.

  • comparative methods of measuring thatch on a creeping bentgrass green
    Crop Science, 1997
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation continues to be a serious problem in densely grown close mowed turfgrass. Several methods are used to measure thatch, ranging from very rapid to very slow, with opinions differing concerning the reliability of the various methods. The objectives of these studies were to evaluate speed of use, precision, reliability, and the practicalities of two of the most commonly used methods of measuring thatch, which are slow, with those of a very rapid method. All three methods were evaluated as part of a field study to determine the effectiveness of mechanical and chemical treatments in controlling thatch on a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (4 and 8x/yr), coring (4x/yr), wetting agent (7x/yr), extra K (4x/yr), lime (4x/yr), and various combinations of these; and interactions of these with topdressing (3 and 6x/yr). Thatch measuring methods used were the ruler, total organic matter (OM) by loss-on-ignition, and a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. The thatchmeter was easy to use, enabling a set of six readings per sub-plot to be made much faster than one core sample could be cut and measured with a ruler. The OM method was tediously slow, taking days to complete, and measured only total OM by weight with no determination for depth. As a method relating to thatch depth, the thatchmeter and ruler methods correlated well with each other with the thatchmeter being more sensitive. The OM method did not correlate with either the thatchmeter or ruler. Based on data from this study, the thatchmeter appears to be the most reliable and practical of the three methods tested.

John M Parham - One of the best experts on this subject based on the ideXlab platform.

  • cultural and chemical controls of thatch and their influence on rootzone nutrients in a bentgrass green
    Crop Science, 1998
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation is a serious problem in densely grown turfgrass maintained under low mowing heights. Opinions differ concerning effectiveness of cultural and chemical controls of thatch. The objectives of these studies were to determine the effectiveness of mechanical and chemical treatments in controlling thatch and their influence on soil nutrient retention and pH in a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (VM 4 and 8x/yr), coring (core 4x/yr), wetting agent (Wet Ag 7x/ yr), extra K (4x/yr), lime (L 4x/yr) and various combinations, and interactions of these with topdressing (Tpd 3 and 6x/yr). Rootzone nutrients determined were Ca, K, and P and rootzone pH levels were determined. Thatch measurements were determined with a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. Lowest non-significant levels of thatch resulted following VM 4x or 8x/yr and VM + coring. Tpd 3x or 6x/yr also effectively prevented thatch buildup. When combining mechanical and chemical methods with Tpd, lowest non-significant levels of thatch resulted following VM 4x or 8x/yr, VM + coring, and VM + L, all combined with Tpd 6x/yr. Extra K (VM + K + L, K + L, K) and Wet Ag resulted in increased thatch. Lime did not influence thatch depth. Loss of rootzone K was 94% and increased with mechanical and chemical treatments. Loss of rootzone P was 86% but extra K and L treatments reduced P loss, especially under pH 7.3 following L treatments. Loss of rootzone Ca was 56% but Land extra K treatments under pH 7.3 reduced this loss.

  • comparative methods of measuring thatch on a creeping bentgrass green
    Crop Science, 1997
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation continues to be a serious problem in densely grown close mowed turfgrass. Several methods are used to measure thatch, ranging from very rapid to very slow, with opinions differing concerning the reliability of the various methods. The objectives of these studies were to evaluate speed of use, precision, reliability, and the practicalities of two of the most commonly used methods of measuring thatch, which are slow, with those of a very rapid method. All three methods were evaluated as part of a field study to determine the effectiveness of mechanical and chemical treatments in controlling thatch on a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (4 and 8x/yr), coring (4x/yr), wetting agent (7x/yr), extra K (4x/yr), lime (4x/yr), and various combinations of these; and interactions of these with topdressing (3 and 6x/yr). Thatch measuring methods used were the ruler, total organic matter (OM) by loss-on-ignition, and a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. The thatchmeter was easy to use, enabling a set of six readings per sub-plot to be made much faster than one core sample could be cut and measured with a ruler. The OM method was tediously slow, taking days to complete, and measured only total OM by weight with no determination for depth. As a method relating to thatch depth, the thatchmeter and ruler methods correlated well with each other with the thatchmeter being more sensitive. The OM method did not correlate with either the thatchmeter or ruler. Based on data from this study, the thatchmeter appears to be the most reliable and practical of the three methods tested.

Cynthia A Harper - One of the best experts on this subject based on the ideXlab platform.

  • cultural and chemical controls of thatch and their influence on rootzone nutrients in a bentgrass green
    Crop Science, 1998
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation is a serious problem in densely grown turfgrass maintained under low mowing heights. Opinions differ concerning effectiveness of cultural and chemical controls of thatch. The objectives of these studies were to determine the effectiveness of mechanical and chemical treatments in controlling thatch and their influence on soil nutrient retention and pH in a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (VM 4 and 8x/yr), coring (core 4x/yr), wetting agent (Wet Ag 7x/ yr), extra K (4x/yr), lime (L 4x/yr) and various combinations, and interactions of these with topdressing (Tpd 3 and 6x/yr). Rootzone nutrients determined were Ca, K, and P and rootzone pH levels were determined. Thatch measurements were determined with a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. Lowest non-significant levels of thatch resulted following VM 4x or 8x/yr and VM + coring. Tpd 3x or 6x/yr also effectively prevented thatch buildup. When combining mechanical and chemical methods with Tpd, lowest non-significant levels of thatch resulted following VM 4x or 8x/yr, VM + coring, and VM + L, all combined with Tpd 6x/yr. Extra K (VM + K + L, K + L, K) and Wet Ag resulted in increased thatch. Lime did not influence thatch depth. Loss of rootzone K was 94% and increased with mechanical and chemical treatments. Loss of rootzone P was 86% but extra K and L treatments reduced P loss, especially under pH 7.3 following L treatments. Loss of rootzone Ca was 56% but Land extra K treatments under pH 7.3 reduced this loss.

  • comparative methods of measuring thatch on a creeping bentgrass green
    Crop Science, 1997
    Co-Authors: Lloyd M Callahan, William L Sanders, John M Parham, Cynthia A Harper, Lori D Lester, Ellen R Mcdonald
    Abstract:

    Thatch accumulation continues to be a serious problem in densely grown close mowed turfgrass. Several methods are used to measure thatch, ranging from very rapid to very slow, with opinions differing concerning the reliability of the various methods. The objectives of these studies were to evaluate speed of use, precision, reliability, and the practicalities of two of the most commonly used methods of measuring thatch, which are slow, with those of a very rapid method. All three methods were evaluated as part of a field study to determine the effectiveness of mechanical and chemical treatments in controlling thatch on a creeping bentgrass (Agrostis palustris Huds.) green growing on a U.S. Golf Association (USGA) rootzone. Thatch control treatments were vertical mowing (4 and 8x/yr), coring (4x/yr), wetting agent (7x/yr), extra K (4x/yr), lime (4x/yr), and various combinations of these; and interactions of these with topdressing (3 and 6x/yr). Thatch measuring methods used were the ruler, total organic matter (OM) by loss-on-ignition, and a rapid surface sod Compression Instrument termed the Thatchmeter II. Treatments and measurements were conducted for 6 yr with results reported for the last 3 yr. The thatchmeter was easy to use, enabling a set of six readings per sub-plot to be made much faster than one core sample could be cut and measured with a ruler. The OM method was tediously slow, taking days to complete, and measured only total OM by weight with no determination for depth. As a method relating to thatch depth, the thatchmeter and ruler methods correlated well with each other with the thatchmeter being more sensitive. The OM method did not correlate with either the thatchmeter or ruler. Based on data from this study, the thatchmeter appears to be the most reliable and practical of the three methods tested.