Resource Book on Horticulture Nursery Management

Air Layering in Guava
c. Grafting: IBA+6BA (500:500 ppm) in Bee wax paste is useful in joining the scion
on stock in many fruit crops. Grapes, Mangoes, Sapota.
d. Budding: The treatment of IBA+6BA (500:500 ppm) in Bee wax paste is useful in
bud joints in Citrus, Roses, Ber, Jamun, etc.
e. Breaking Dormancy: Gibberellins play an important role in breaking the
dormancy of seeds of fruit crops by loosening the seed coat to permit water inside
the embryo for germination, e.g., 500-700 ppm of GA3 in Ber.
f. Hastening Rootstock Growth
� Rangpur lime seedlings: 200 ppm of GA3 at one month interval.
� Jamberi rootstock seedlings: 200 ppm of GA3 at one month interval.
� Aonla seedlings: 20 ppm 6-BA at one month interval.
� Khirni and Custard apple seeds: 1000 ppm GA3, 20-24 hours seed soaking.
Methods of Application
The effectiveness of plant growth regulator is not only dependant on the
concentration of substance, type of the plant species but also on the method of
application. Different methods are used for the treatment of cuttings and layers with plant
growth regulators.
1. Prolonged Soaking Method
In this method the basal end of cutting are dipped in the dilute solution (20 to 200
ppm) of the hormone for 24 hour in a cool dry place. After the treatment, the
cuttings are planted in the nursery or in other suitable growing medium. The
concentration of the hormone or growth regulator usually varies from 20 ppm to 200
ppm, depending on the plant species and type of the cuttings. The concentration is
<strong>Resource</strong> <strong>Book</strong> on Horticulture Nursery Management : 104