Abstract
The experiment was conducted at the Regional Spices Research Center, BARI, Gazipur during June 2016 to October 2017 to evaluate the effect of genotype and growth regulator (IBA) on the success and performance of plum air layering. Air layering was done on two plum varieties (BARI Alubokhara-1 and PD Gaz 004) using seven levels of IBA concentration (viz. 0, 1000, 2000, 3000, 4000, 5000 and 6000 ppm) under a complete randomized (factorial) design (CRD). Significant variation was observed on rooting, establishment and death of layers due to variety and IBA concentrations except rooting and separation time. The un-fruiting line PD Gaz 004 showed outstanding performance in rooting and survivability of layers over BARI Alubokhara-1. Poor rooting and lower establishment caused very high mortality of layers in BARI Alubokhara-1. Rooting and survivability, number of roots, length of roots and leaf production increased with the increasing levels of IBA concentration up to 5000 ppm. The maximum (10 out of 10) rooting success of layer with 65.83% and 59.17% establishment from PD Gaz004 was obtained when 3000 and 4000 ppm IBA was used, respectively. In BARI Alubokhara-1, the highest rooting success (3.08), establishment rate (29.42%), number of root (4.28/layer) and root length (5.08 cm) were recorded with 4000 ppm IBA concentration.
Highlights
The experiment was conducted at the Regional Spices Research Center, BARI, Gazipur during June 2016 to October 2017 to evaluate the effect of genotype and growth regulator (IBA) on the success and performance of plum air layering
Air layering was done on two plum varieties (BARI Alubokhara-1 and PD Gaz 004) using seven levels of IBA concentration under a complete randomized design (CRD)
BARI Alubokhara-1 was significantly reluctant in rooting compared to the line PD Gaz 004 for successful layering (Table 1)
Summary
After several years evaluation of various germplasm, one was found superior in respect of adaptability, yield and yield attributes, quality, pest and disease tolerance and released as “BARI Alubokhara-1” from the Spices Research Center of Bangladesh Agricultural Research Institute in 2013 [5] This variety produces more number of fruits (1221/plant/year) in June-July and yielded 10.29 kg/plant or 6.43 t/ha. Fruits are attractive dark red colored, sour sweet taste (TSS 10.6%), medium size (3 × 2.74 cm, 8.67 g) and globular shape having high nutritive and medicinal properties This variety performed well in past five years and adopted well in the environment of Bangladesh with low disease and pest infestation [4]. The main objectives of experiment were: 1) Standardization of IBA concentration for air layering propagation techniques of Alubokhara (plum) in the environmental condition of Bangladesh. 2) To increase success of layering using growth regulators and appropriate variety
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