Poinsettia Rooted Finished Trial Auburn University Fall 2016

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© The Author(s) Published by Science and Education Publishing.

Presentation transcript:

Poinsettia Rooted Finished Trial Auburn University Fall 2016

Poinsettia Rooted Finished Trial Auburn University Fall 2016 Objective: Determine performance of rooted poinsettias in HydraFiber vs. peat-lite substrates. Initiated 8/17; Terminated 11/22 Commercial control; mixes ranging from 30% to 60% 160WB Poinsettia ‘Christmas Day Red’ 6” Standard pots Clear water until 8/24; N at 150ppm w/15-3-16 +3 Ca 2 Mg; lowered to 100ppm N on 10/1 Pinched 9/7 Chemical treatments: Safari 1 tsp/gal / Capsil 2.5mL/gal (9/2) B-nine at 1250 ppm; Cycocel 800 ppm spray (9/19)

Media Treatments Commercial Control (Peat/Perlite) 70% Peat: 30% HydraFiber 160WB 60% Peat: 40% HydraFiber 160WB 50% Peat: 50% HydraFiber 160WB 40% Peat: 60% HydraFiber 160WB 50% Peat: 50% HydraFiber 160WB + N* 40% Peat: 60% HydraFiber 160WB + N* *Supplemental slowly available N added

Substrate pH

Substrate EC

Growth Index and Chlorophyll SPAD Measurements 49 DAP ab abc abc bc c bc Least squares means comparisons among substrates using the Shaffer simulated method at α = 0.05. (NS for Growth Index) Least squares means comparisons to the commercial mix using the Dunnett's method at α = 0.05 (*). (SPAD only) Note: None of the HydraFiber mixes were different from the commercial mix based on Dunnett's test. (SPAD only)

Shoot Dry Weight 94 DAP Least squares means comparisons among substrates using the Shaffer simulated method at α = 0.05. (NS for Shoot Dry Weight)

Foliar Tissue Analysis 63 DAP (%) (ppm) Substrate N P Mg K Ca S B Fe Mn Cu Zn Al Commercial mix 3.44ns 0.280ab 0.349b 2.60c 0.715ab 0.199ns 16.95ab 53.2ns 28.1c 0.725b 19.7c 13.1ns 30% HydraFiber 3.62 0.262b 0.434ab 2.68bc 0.568b 0.205 14.63b 53.7 39.0bc 0.875ab 21.4bc 11.0 40% HydraFiber 3.16 0.290ab 0.447a 2.95abc 0.633ab 0.202 15.85ab 48.9 48.4ab 0.900ab 24.2abc 10.0 50% HydraFiber 3.89 0.276ab 0.508a 3.04ab 0.758a 0.220 17.93a 58.7 58.5a 1.100ab 26.8ab 12.1 60% HydraFiber 3.79 0.308a 0.478a 3.15a 0.750a 0.214 18.23a 57.6 66.0a 1.275a 27.1ab 15.4 50% HydraFiber+N 3.51 0.250b 2.65bc 0.688ab 17.85a 52.0 56.7ab 0.850ab 24.7abc 9.7 60% HydraFiber+N 0.244b 0.453a 2.69bc 0.702ab 0.215 17.80a 55.7 55.4ab 29.5a 12.9 Least squares means comparisons among substrates using the Shaffer simulated method at α = 0.05. ns=not significant.

Control 70 Peat: 30 160WB Dr. Glenn Fain Auburn University

Control 60 Peat: 40 160WB Dr. Glenn Fain Auburn University

Control 50 Peat: 50 160WB Dr. Glenn Fain Auburn University

Control 50 Peat: 50 160WB + N Dr. Glenn Fain Auburn University

Control 40 Peat: 60 160WB Dr. Glenn Fain Auburn University

Control 40 Peat: 60 160WB + N Dr. Glenn Fain Auburn University

Conclusions All tested treatments resulted in market-quality plants. Can successfully grow poinsettias up to 60% HydraFiber. Supplemental N did not provide commercially significant benefits at tested feed rate. No statistical differences in plant growth (Shoot dry weight). Despite some statistical differences in SPAD and foliar tissue measurements, differences did not manifest in visual quality differences.