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Use of CULTAR
- Thread starter om_omi
- Start date
19 deepika_fruit
Member
Paclobutrazol. Trade name: Bonzi, Clipper, Cultar, Holdfost, Klipper, MET, Parlay, PP333.
THE EFFECTS OF PACLOBUTRAZOL
One method to manipulate flowering is to use the plant growth regulator, paclobutrazol. The post- harvest application of a small amount of paclobutrazol to the soil significantly promotes flowering and fruiting in the following year. Trials over the last two years have shown the following benefits from the treatment:
•A significant increase in flowering leading to increased yields.
•The early flowering considerably enhanced fruit maturity. Treated trees flowered three to four weeks early, which reduced the time to fruit maturity by at least two weeks.
•Visually, the fruit developed a better external colour
SOME IMPORTANT CONSIDERATIONS IN THE USE OF PACLOBUTRAZOL
How does paclobutrazol act?
Available evidence strongly suggests that flower initiation depends on the presence of an unknown flower- promoting factor or factors synthesised in the leaves. At the same time,there are other factors in the shoots which work against the flowering factor or factors.
It is believed that a group of plant hormones called gibberellins act as inhibitors to flowering. When paclobutrazol is applied to the soil, it
moves up through the roots into the shoots and, due to its anti-gibberellin properties, blocks the synthesis of flowering inhibitors,thereby allowing the flower-promoting factor(s) to work.
How and when to apply paclobutrazol?
The application of paclobutrazol to soil as a drench around the tree trunk (collar drench) is the most effectivemethod, as it ensures proper up uptake by the tree. The required quantity is mixed in approximately one litre of water and poured onto the soil around the trunk in a circular band. In the Top End, the ideal time to apply paclobutrazol is from soon after harvest to early January In dry conditions, a light irrigation is recommended after application. Foliar sprays have been ineffective
In high tree density situations with closer spacing, it is recommended to apply paclobutrazol early when trees are about three years old.
However, when trees are spaced farther apart, say 10 m, early application with paclobutrazol will reduce canopy size and the fruit bearing area. In such a sit uation, treatment can commence when trees are about five years old. Tree size and canopy fill are important considerations. Large trees, especially seedling trees, respond more slowly than young, bearing, graft ed trees. The dosage required also varies between cultivars. Florida cultivar s, such as Irwin, Glen and Tommy Atkins require a lower dosage than Kensington
Pride.
THE EFFECTS OF PACLOBUTRAZOL
One method to manipulate flowering is to use the plant growth regulator, paclobutrazol. The post- harvest application of a small amount of paclobutrazol to the soil significantly promotes flowering and fruiting in the following year. Trials over the last two years have shown the following benefits from the treatment:
•A significant increase in flowering leading to increased yields.
•The early flowering considerably enhanced fruit maturity. Treated trees flowered three to four weeks early, which reduced the time to fruit maturity by at least two weeks.
•Visually, the fruit developed a better external colour
SOME IMPORTANT CONSIDERATIONS IN THE USE OF PACLOBUTRAZOL
How does paclobutrazol act?
Available evidence strongly suggests that flower initiation depends on the presence of an unknown flower- promoting factor or factors synthesised in the leaves. At the same time,there are other factors in the shoots which work against the flowering factor or factors.
It is believed that a group of plant hormones called gibberellins act as inhibitors to flowering. When paclobutrazol is applied to the soil, it
moves up through the roots into the shoots and, due to its anti-gibberellin properties, blocks the synthesis of flowering inhibitors,thereby allowing the flower-promoting factor(s) to work.
How and when to apply paclobutrazol?
The application of paclobutrazol to soil as a drench around the tree trunk (collar drench) is the most effectivemethod, as it ensures proper up uptake by the tree. The required quantity is mixed in approximately one litre of water and poured onto the soil around the trunk in a circular band. In the Top End, the ideal time to apply paclobutrazol is from soon after harvest to early January In dry conditions, a light irrigation is recommended after application. Foliar sprays have been ineffective
In high tree density situations with closer spacing, it is recommended to apply paclobutrazol early when trees are about three years old.
However, when trees are spaced farther apart, say 10 m, early application with paclobutrazol will reduce canopy size and the fruit bearing area. In such a sit uation, treatment can commence when trees are about five years old. Tree size and canopy fill are important considerations. Large trees, especially seedling trees, respond more slowly than young, bearing, graft ed trees. The dosage required also varies between cultivars. Florida cultivar s, such as Irwin, Glen and Tommy Atkins require a lower dosage than Kensington
Pride.
fridarubinola1965
New Member
Has Placlobutrazol (treatment over the soil) any negative / positive effekt on the fruit size (Apple) or on the storability of the fruits?