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Copper Reduces Shoot Growth and Root Development of Creeping Bentgrass

^a Dep. of Horticulture, Iowa State Univ., Ames, IA 50010-1100 USA

View larger version (17K): [in a new window]   Fig. 1 Regression analysis of Penncross creeping bentgrass shoot tissue Cu concentration. Tissue samples collected during Weeks 3 to 12 were combined and analyzed by inductively coupled argon plasma spectrometry (ICAP/IRIS) for Cu. Data from both experiments were combined for analysis. Vertical bars represent the standard error of mean values. Regression equations describing these relationships for silica and calcareous sands are: y = 10.31 + 0.07x - 0.0002x2, r2 = 0.74, and y = 9.14 + 0.03x - 0.00008x2, r2 = 0.52, respectively

View larger version (21K): [in a new window]   Fig. 2 Regression analysis of Penncross creeping bentgrass root tissue Cu concentration. Tissue samples were collected during Week 12 and analyzed for Cu by inductively coupled argon plasma spectrometry (ICAP/IRIS) for plants grown in Exp. 2 only. Vertical bars represent the standard error of mean values. Regression equations describing these relationships for silica and calcareous sands are: y = 177.59 + 20.01x - 0.022x2, r2 = 0.93, and y = 257.20 + 6.10x, r2 = 0.95, respectively

View larger version (17K): [in a new window]   Fig. 3 Regression analysis of Penncross creeping bentgrass dry root mass for plants grown in either calcareous or silica sand in the presence of increasing concentrations of Cu. Root mass measurements were taken after 12 wk, and data from both experiments were pooled. Vertical bars are standard errors of the mean. Regression equations showing the relationships for silica and calcareous sands are: y = 793.4 - 0.7x, r2 = 0.79, and y = 842.1 - 1.6x + 0.001x2, r2 = 0.67, respectively

View larger version (18K): [in a new window]   Fig. 4 Regression analysis of diethylenetriaminepentaacetic acid– triethanolamine (DTPA–TEA)–extractable Cu as influenced by the incorporation of Cu in two sand media. Data from both experiments were combined for analysis. Vertical bars are standard errors of the mean. Regression equations for silica and calcareous sands are: y = -5.04 + 1.05x - 0.0001x2, r2 = 0.91, and y = 4.53 + 0.821x, r2 = 0.97, respectively