{ "data_id": "96", "name": "cjs", "exact_name": "cjs", "version": 3, "version_label": null, "description": "**Author**: Dr. Fernando Camacho \n**Source**: Unknown - 1995 \n**Please cite**: Camacho, F. and Arron, G. (1995) Effects of the regulators paclobutrazol and flurprimidol on the growth of terminal sprouts formed on trimmed silver maple trees. Canadian Journal of Statistics 3(23).\n\nData on tree growth used in the Case Study published in the September, 1995 issue of the Canadian Journal of Statistics. This data set was been provided by Dr. Fernando Camacho, Ontario Hydro Technologies, 800 Kipling Ave, Toronto Canada M3Z 5S4. It forms the basis of the Case Study in Data Analysis published in the Canadian Journal of Statistics, September 1995. It can be freely used for noncommercial purposes, as long as proper acknowledgement to the source and to the Canadian Journal of Statistics is made.\n\n\nDescription\n\n\nThe effects of the Growth Regulators Paclobutrazol (PP 333)\nand Flurprimidol (EL-500) on the Number and Length of Internodes\nin Terminal Sprouts Formed on Trimmed Silver Maple Trees.\n \nIntroduction:\n \nThe trimming of trees under distribution lines on city streets and\nin rural areas is a major problem and expense for electrical\nutilities. Such operations are routinely performed at intervals of\none to eight years depending upon the individual species growth rate\nand the amount of clearance required. Ontario Hydro trims about\n500,000 trees per year at a cost of about $25 per tree.\n \nMuch effort has been spent in developing chemicals for the horticultural\nindustry to retard the growth of woody and herbaceous plants. Recently,\na group of new growth regulators was introduced which was shown to be\neffective in controlling the growth of trees without producing\nnoticeable injury symptoms. In this group are PP 333 ( common name\npaclobutrazol) (2RS, 3RS - 1 -(4-chlorophenyl) - 4,4 - dimethyl - 2 -\n(1,2,4-triazol-l-yl) pentan - 3- ol and EL-500 (common name flurprimidol\nand composition alpha - (1-methylethyl) - alpha - [4-(trifluromethoxyl)\nphenyl] - 5- pyrimidine - methanol). Both EL-500 and PP-333 have been\nreported to control excessive sprout growth in a number of species\nwhen applied as a foliar spray, as a soil drench, or by trunk injection.\nSprout length is a function of both the number of internodes and\nthe length of the individual internodes in the sprout. While there\nhave been many reports that both PP 333 and EL-500 cause a reduction\nin the length of internodes formed in sprouts on woody plants treated\nwith the growth regulators, there has been but one report that EL-500\napplication to apple trees resulted in a reduction of the number\nof internodes formed per sprout.\n \nThe purpose of the present study was to investigate the length of the\nterminal sprouts, the length of the individual internodes in those\nsprouts, and the number of internodes in trimmed silver maple trees\nfollowing trunk injection with the growth regulators PP 333 and EL-500.\n \nExperimental Details.\n \nMultistemmed 12-year-old silver maple trees growing at Wesleyville,\nOntario were trunk injected with methanolic solutions of EL-500\nand PP-333 in May of 1985 using a third generation Asplundh\ntree injector.\n \nTwo different application rates (20 g\/L and 4 g\/L) were used for each\nchemical. The volume of solution (and hence the amount of active\ningredient) injected into each tree was determined from the diameter\nof the tree, using the formula: vol(mL) = (dbh)*(dbh)*.492 where dbh\nis the diameter at breast height. Two sets of control trees were\nincluded in the experiment. In one set, tree received no injection\n(control) and in a second set, the trees were injected with\nmethanol, the carrier in the growth regulator solutions. Ten trees,\nchosen at random, were used in each of the control and experimental\nsets. Prior to injection, all the trees were trimmed by a forestry\ncrew, with their heights being reduced by about one third.\n \nIn January 1987, twenty months after the trees were injected, between\nsix and eight limbs were removed at random from the bottom two-thirds\nof the canopy of each of the ten trees in each experimental and control\nset. The limbs were returned to the laboratory and the length of all\nthe terminal sprouts, the lengths of the individual internodes, and\nthe number of internodes recorded. Between one and 25 terminal\nsprouts were found on each limb collected. Sprouts which had a\nlength of 1 cm or less were recorded as being 1 cm in length.\nIn such spouts, the internode lengths were not measured, but were\ncalculated from the total length of the sprout and the number\nof internodes counted. Internode lengths were then expressed to one\ndecimal place. In two instances, one of the ten trees in a set\ncould not be sampled because limb removal would have jeopardized the\nhealth of the tree over the long-term.\n \nData set:\n \nEach of the records represents a terminal sprout and contains the\nfollowing information:\n N the sprout number\n TR treatment 1 control\n 2 methanol control\n 3 PP 333 20g\/L\n 4 PP 333 4g\/L\n 5 EL 500 20g\/L\n 6 EL 500 4g\/L\n TREE tree id\n BR branch id\n TL total sprout length (cm)\n IN number of internodes on the sprout\n INTER a list of the lengths of the internodes in the sprout,\n starting from the base of the sprout (129 entries)\n \nSprouts 1868 to 1879 do not have branch identification data.", "format": "ARFF", "uploader": "Joaquin Vanschoren", "uploader_id": 2, "visibility": "public", "creator": null, "contributor": null, "date": "2016-04-11 18:32:46", "update_comment": null, "last_update": "2016-04-11 18:32:46", "licence": "Public", "status": "active", "error_message": null, "url": "https:\/\/www.openml.org\/data\/download\/1910442\/phpDAC5gS", "default_target_attribute": "TR", "row_id_attribute": "N", "ignore_attribute": null, "runs": 0, "suggest": { "input": [ "cjs", "Data on tree growth used in the Case Study published in the September, 1995 issue of the Canadian Journal of Statistics. 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