Culling is possibly one of the most important procedures to be carried out in the nursery. Process to remove any abnormal seedlings & retain the good ones. The number of seedlings to be culled ranges from as little as 5 – 10% to as high as 40 – 50% depending on the plant materials used. Culling rate in a well-managed nursery should be less than 25%
•Purpose
of culling:
1)To
determine only the very good palm seedlings are planted in the field
2)To
prevent the field planting of potential low yielding or no yield at all
seedlings
•Generally,
2 rounds of culling are carried out in the SINGLE STAGE NURSERY for abnormal
seedlings:
1)3
months after seeds germination
2)Final
selection at the time of field planting @ at 12 months after seeds germination
whichever comes earlier
•Generally,
3 rounds of culling are carried out in the DOUBLE STAGE NURSERY for abnormal
seedlings:
1)When
the seedlings are about 3 – 4 months old. Before transplanting the seedling
from pre-nursery to main nursery - PS
2)When
seedlings are about 7 months old (3 - 4 months after transplanting - MN
3)Final
selection at the time of field planting @ at 12 months after seeds germination
whichever comes earlier - MN
CULLING IN PRE NURSERY & SINGLE
STAGE NURSERY (EARLY STAGE)
•The
main types of undesirable palms (should be culled) at this stage are as
follows:
-Narrow leaf
-Grass leaf
-Rolled leaf
-Twisted leaf
-Crinkled leaf
-Collante
-Stunted or weak
(runts) palms
-Chimaera
Chimaera and Narrow pinnae problem
HARDENING PROCESS
From polybag to soil
To introduce harsh environment to the plants
To reduce pest
Increases possibilities so that the plants can survive
CALCULATION EXAMPLE
1 tree = 1 kg 1 sack = 50 kg
1 sack / 50 kg = kg / 143 trees = (143 trees / hectare) x 500 hectare
= 1430 sacks
1 hectare = 100 m x 100 m
= 10000 meter square
We were discussed and answered the question given by lecturers by using the formula above.
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