5. The eect of plant growth regulators and spear bud scales on spear elon-

gation in asparagus was investigated by Yang-Gyu and Woolley (2006).

Elongation rate of spears is an important factor determining nal yield of asparagus in many temperate climatic conditions. Spears were harvested from 6-year-old Jersey Giant asparagus plants grown in a commercial plant-

ing at Bulls (latitude 40.2S, longitude 175.4E), New Zealand. Spears were harvested randomly and transported from eld to lab for investigation. Af-

ter trimming to 80mm length, spears were immersed completely for 1 h in aqueous solutions of 10 mg l-1 concentration of indole-3-acetic acid (IAA), abscisic acid (ABA), GA3 or CPPU (Sitofex EC 2.0%; SKW, Trostberg, Germany) in test tubes. Control spears were submerged in distilled wa-

ter for 1 h. The experiment was a completely randomized design with ve replications (spears) per treatment. The resulting data (nal spear length in mm) is shown below.

(a) Perform the Analysis of Variance to test the hypothesis of no treatment eect.

(b) Use the Tukey method to test all pairwise comparisons of treatment means.

(c) Use the Dunnett procedure to compare all treatment group means to the control mean.

Transcribed Image Text:

Control IAA ABA GA3 CPPU 94.7 89.9 96.8 99.1 104.4 96.1 94.0 87.8 95.3 98.9 86.5 99.1 89.1 94.6 98.9 94.9 98.5 92.8 91.1 99.4 89.4 93.1 106.5 95.7 104.8