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Analysis of variance among coring treatments, root zone depths, and measurement dates and their effects on total root count and total root length in Providence creeping bentgrass in 2006 and 2007.

 
2006
2007
Source Total root count Total root length Total root count Total root length
Coring (C) ** ** ** **
Depth (DE) ** ** ** **
Date (DA) ** * ** *
C × DE * *
C × DA ns‡ ns *
DE × DA * * * *
*Refers to the 0.05 significance level.
**Refers to the 0.01 significance level.
Refers to the 0.10 significance level.
Nonsignificant F test.



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Providence creeping bentgrass total root count (TRC) in the 0- to 24-cm root zone in response to spring only cored, spring plus summer cored, and noncored treatments on three measurement dates in 2006 and 2007.

 
TRC
Corings 5 July 3 Aug. 28 Aug.
2006
SP + SU† 245.4c‡ 219.7b 256.9b
SP§ 310.4a 258.2a 297.3a
N-C¶ 270.8b 241.8a 296.9a
2007
30 May 13 July 4 Sept.
SP + SU 243.4a 122.2a 152.5a
SP 227.9ab 128.9a 118.5b
N-C 175.9b 104.4b 126.6b
Spring plus summer (SP + SU) corings were performed on 27 Apr., 6 and 28 June, and 25 July 2006. Spring plus summer corings were performed on 29 Apr., 6 June, and 3 and 31 July 2007.
Means in a column followed by the same letter in a year are not significantly different based on Fisher's protected least significant difference test (P ≤ 0.05).
§Spring only (SP) coring was performed on 27 Apr. 2006 and 29 Apr. 2007.
N-C designates the noncored control treatment.



View Full Table | Close Full ViewTable 3.

Providence creeping bentgrass total root count (TRC) in response to spring only cored, spring plus summer cored and noncored treatments at different root zone depths in 2006 and 2007.

 
TRC
Corings 0–6 cm 6–12 cm 12–24 cm
2006
SP + SU† 132.3ab‡ 53.9b 54.5c
SP§ 143.8a 63.5a 81.3b
N-C¶ 125.2b 45.2c 99.4a
2007
SP + SU 97.0ab 41.9a 33.8a
SP 105.2a 33.0b 20.3a
N-C 86.8b 21.4c 27.3a
Spring plus summer (SP + SU) corings were performed on 27 Apr., 6 and 28 June, and 25 July 2006. Spring plus summer corings were performed on 29 Apr., 6 June, and 3 and 31 July 2007.
Means in a column followed by the same letter in a year are not significantly different based on Fisher's protected least significant difference test (P 0.05).
§Spring only (SP) coring was performed on 27 Apr. 2006 and 29 Apr. 2007.
N-C designates the noncored control treatment



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Providence creeping bentgrass total root length (TRL) in the 0- to 24-cm root zone in response to spring only cored, spring plus summer cored and noncored treatments on three measurement dates in 2006 and 2007.

 
TRL
Corings 5 July 3 Aug. 28 Aug.
cm
2006
SP + SU† 153.1b‡ 126.3b 136.9b
SP§ 201.5a 153.4a 161.6a
N-C¶ 168.9b 143.3a 165.6a
2007
30 May 13 July 4 Sept.
SP + SU 112.6a 73.5a 79.7a
SP 103.5a 74.4a 59.2b
N-C 79.0b 62.5b 62.7b
Spring plus summer (SP + SU) corings were performed on 27 Apr., 6 and 28 June, and 25 July 2006. Spring plus summer corings were performed on 29 Apr., 6 June, and 3 and 31 July 2007.
Means in a column followed by the same letter in a year are not significantly different based on Fisher's protected least significant difference test (P 0.05).
§Spring only (SP) coring was performed on 27 Apr. 2006 and 29 Apr. 2007.
N-C designates the noncored control treatment.



View Full Table | Close Full ViewTable 5.

Providence creeping bentgrass total root length (TRL) in response to spring only cored, spring plus summer cored and noncored treatments at different root zone depths in 2006 and 2007.

 
TRL
Corings 0–6 cm 6–12 cm 12–24 cm
cm
2006
SP + SU† 70.4a‡ 35.4a 33.0b
SP§ 81.1a 42.4a 49.5ab
N-C¶ 69.5a 29.7a 60.1a
2007
SP + SU 44.7a 24.3a 19.6a
SP 48.1a 18.4b 12.6b
N-C 38.8b 13.2c 15.9ab
Spring plus summer (SP + SU) corings were performed on 27 Apr. , 6 and 28 June, and 25 July 2006. Spring plus summer corings were performed on 29 Apr., 6 June, and 3 and 31 July 2007.
Means in a column followed by the same letter in a year are not significantly different based on Fisher's protected least significant difference test (P ≤ 0.05).
§Spring only (SP) coring was performed on 27 Apr. 2006 and 29 Apr. 2007.
N-C designates the noncored control treatment.