Rudbeckia Goldblitz Additional Culture Information Daylength Response Forcing option for autumn sales
Rudbeckia Goldblitz - Germination Variety
Days to germ
Germ rate at day 7
Germ rate at day 14
Yield Potential at day 21
Goldblitz
5
82
89
85
Goldsturm
5
82
88
79
Tray size: 288 Temperature: 22⁰C Light: Yes Cover: Yes
Rudbeckia Goldblitz - Daylength Response Objective: to find out Rudbeckia Goldblitz daylength response compared with Goldsturm. •
Variety: Goldblitz & Goldsturm
•
Sow date: week 2, plug tray size: 288 cell
•
Germination condition: 22 ⁰C with light, cover with vermiculite
•
Transplant date: week 11
•
Container size: 72 tray for SD bulk then 19 cm (3-3,5 L) pot for directly DL treatments
•
Daylength (DL) treatments: 10, 12, 13, 14, 16 hours, and NI (Night Interruption): 1) Start daylength treatments right after transplant from 288 plug, about 3-4 leaf stage. 2) Start daylength treatments after SD (10 hours) bulked until 10 leaf stage.
Rudbeckia Goldblitz - Photoperiod Response without SD bulked
Daylengt h treatmen ts
10
12
13
14
16
NI with SD bulked
Rudbeckia Goldsturm - Photoperiod Response without SD bulked
Daylength treatments
10
12
13
14
16
NI with SD bulked
Flowering under natural increasing daylength Without SD bulk Goldblitz
Uniform
SD bulk to 10 leaves
Goldsturm
Goldblitz
Not uniform
Goldsturm
Uniform
Uniform but 10 days later
Daylength Response Goldblitz vs Goldsturm • The same as Goldsturm, Goldblitz also requires Long Day to flower. • However, Goldblitz does not have to bulk under SD until 10 leaf stage, although SD bulked may make slightly more uniform flower. • The critical daylength for Goldblitz is about 14.5 hours, while Goldsturm is about 15 hours, so half an hour longer.
Rudbeckia Goldblitz - Forcing for Autumn Sales Objectives: to force Rudbeckia Goldblitz uniform flowering for autumn market (target week 35) via manipulating daylength & to compare plants flower uniformity between short day (SD) treated liners. •
Variety: Rudbeckia Goldblitz & Goldsturm
•
Sow: week 10, plug tray size: 288 cell, step-up to 72 tray at week 15
•
SD bulk treatments in 72 tray: 1. Bulk in 10-hour SD from 2 to 10 true leaves 2. Without SD bulk, continuously grown under natural long day (LD)
•
Transplant to natural LD day: week 21 when SD-plug reach 10 true leaves
•
Container size: 19 cm (3-3,5 L) pot with 1ppp and 30 cm (10 L) with 3ppp
•
Finish production: outdoor with ADT 24 ⁰C, DLI 42.1 mol/m2/d, drip irrigation, 160-200ppm N CLF
•
PGR: None
Rudbeckia Goldblitz – 30 cm pot with 3ppp Week 30 With SD bulked plugs
Without SD bulked plugs
Goldblitz
Goldsturm
Rudbeckia Goldblitz – 30 cm pot with 3ppp Week 33 With SD bulked plugs
Without SD bulked plugs
√
√
√
x
Goldblitz
Goldsturm
Rudbeckia Goldblitz – 19 cm pot with 1ppp Week 30 With SD bulked plugs
Goldsturm
Goldblitz
Without SD bulked plugs
Rudbeckia Goldblitz – 19 cm pot with 1ppp Week 33
√ Goldsturm
x
√
With SD bulked plugs
Goldblitz
√
Without SD bulked plugs
Rudbeckia Goldblitz - Forcing for Autumn Sales 1. Different from Goldsturm, Goldblitz can be successfully forced to flower for autumn sales, without SD bulked to 10 leaves. Its crop time could be about 2-3 weeks earlier than Goldsturm. 2. With SD bulked, the crop time of Goldblitz was about one week earlier than Goldsturm.
Forcing Schedule •
Target marketing time: week 34-35
•
Sowing: week 11-12 to 288-cell tray
•
Transplant: week 15-16, SD bulked not necessary
•
Container size: 19 cm (3-3,5 L) pot with 1ppp and 30 cm (10 L) with 3ppp
•
Growing temperature: ADT 22-24 ⁰C
•
Total crop time: 23-24 weeks