Monday, January 4, 2016

Dragon Fruit Fruiting Results from 2015

The results described here are compilation of data from the table published at https://fruitsandgardening.blogspot.com/2016/01/dragon-fruit-flowers-and-fruits-2015.html


Variety codes


8S - 8S, Sugar Dragon
AB - American Beauty
D - Delight
G2 - Thomson G2
HC - Halley's Comet
PG - Physical Graffiti
PP - Pink Panther
VG - Vietnamese Giant
VR - Valdivia Roja

Bagging fruits after pollination


This year I wanted to find out if bagging the flowers after pollination improved the fertilization success. I garden in CA Central Valley, and too often our summer nights here can be dry and windy. Paul Thomson in his book mentioned that success of fertilization depends on air humidity.  I covered some flowers with one gallon Ziploc bags with cut corners and foil attached to the bag as shown in the pictures below.  The bag stayed on the flower for about a week. This was my attempt to increase humidity around flower during pollen tube development.


























Bagging flowers did not improve fertilization


After following the fate of 142 flowers, I came to the conclusion that bagging flowers after pollination did not improve the fertilization rate. Fertilization success was quite high for both, the covered with bags (84%), and not covered flowers (90%). The fertilization success data is in the table below.

  # bagged flowers % fertilization for bagged # not bagged flowers % fertilization for not bagged All flowers % fertilization for all flowers
Fertilized 54 84 70 90 124 87
Failed 10   8   18  
Total 64   78   142  


Bagging flowers did not improve fruit weight


Since I collected the weight data for each fruit, I also wanted to check if bagging improved the fruit weight.  Average weight for bagged and not bagged fruits per each variety is in the table below. It does not seem that bagging helped to increase the fruit weight.  Three varieties showed higher weight when bagged, and three varieties had better weight when not bagged.  See the numbers in red font in the table.

variety average weight, not bagged # of not bagged fruits average waight, bagged  # of bagged fruits average weight for all total number of fruits 
8S 117 27 97 20 107 47
AB 0 0 337 2 337 2
D 233 6 292 5 263 11
G2 0 0 295 6 295 6
HC 378 5 0 0 378 5
PG 264 19 240 10 252 29
PP 141 4 125 5 133 9
VG 315 7 385 3 350 10
VR 230 2 256 2 243 4
70 53 123




Flower to fruit time


And the last table here shows the time from flower to fruit for each variety.  I only used data for the first 100 fruits from flowers opened up to Sept 2. The fruit development during late fall was sub-optimal and required more days than during summer weather.  The fruits were typically picked 5-6 days after fruit color change.

variety days from flower  to fruit # fruits
8S 49 31
AB 51 1
D 45 9
G2 47 6
HC 47 4
PG 46 29
PP 48 9
VG 44 7
VR 50 4

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