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Growth, Harvesting Time, Yield and Quality of Mango (cv. Langra) as Influenced by Soil Drench Application of Paclobutrazol

Babul C. Sarker
Principal Scientific Officer
Pomology Division, HRC, BARI, Gazipur 1701

H. Rahman
Scientific Officer
Regional Agricultural Research Station, Jamalpur

M. A. Haque
Scientific Officer
Regional Agricultural Research Station, Jamalpur

Abstract/ Executive Summary:

The experiment to manipulate the alternate bearing habit, harvesting time, increasing yield and quality of mango (cv.Langra) was carried out at the RARS, Jamalpur at 2011-2012. The year 2011-2012 was the off year for Langra. Hence the study was undertaken. Langra is a popular commercial variety of mango having alternate bearing habit. Paclobutrazol at 1500, 4500, 7500 ppm and control (water application) were included in the study as treatments. Plants soil drenched with paclobutrazol at 7500 ppm produced the highest number of panicles/plant (880), while control plant produced only 10 panicles. Plants with paclobutrazol at 4500 ppm exhibited maximum fruit retention/panicles (0.93) as well as produced the highest number of fruits/plant (474.33). Control plants exhibited the lowest fruit retention/panicles (0.47) and fruits/plant (6.33). Paclobutrazol at higher concentration (7500 ppm) exhibited the heaviest fruit (283.67 g). Soil drenching of paclobutrazol at 4500 ppm exhibited maximum yield (117.10 kg) as compared to minimum yield in control (1.55 kg/plant). Stone weight, skin weight and TSS content of fruits were also found the highest in the plants under soil drenched with paclobutrazol compared to non treated control plants.

Keywords: Mango, Paclobutrazol, Alternate bearing habit, Soil drenching, Flower regulate

Location: Fruit Farm of Regional Agricultural Research Station, Jamalpur

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Crop-Soil-Water Management

Commodity: Mango

Objectives:

To manipulate the alternate bearing habit, reducing harvesting time, increasing yield and quality of mango cv. Langra through paclobutrazol.
To regulate flowering and fruiting and also increase the yield and quality of mango cv. Langra by the use of paclobutrazol.
To find out the appropriate doses of paclobutrazol on flowering, yield and good quality fruits of mango cv. Langra.

Methodology:

The experiment was carried out at the Fruit Farm of RARS, Jamalpur during the 2011-2012. The 11 years old Langra plants with a plant spacing of 8 x 8 m were used in the study. The experiment was laid out in a Randomized Complete Block Design with 3 replications. Paclobutrazol at 1500, 4500, 7500 ppm and control (water application) were included in the study as treatments. The solutions of 1500, 4500, 7500 ppm were prepared by dissolving 6, 18 and 30 ml of 25 % paclobutrazol (Syngenta Chem. Co. Ltd., India) into 1 litre of fresh water each respectively. Paclobutrazol treatments were soil drenched according to Burondkar & Gunjate (1993), in which 10 small holes (10–15 cm depth) were prepared in the soil around the collar region of the plants just inside the fertilizer ring. The prepared solutions of paclobutrazol as per treatment uniformly drenched into the wholes and the soil was reworked after application of paclobutrazol on 15 July 2010. Only water was applied in the control plants. The data of the following parameters were recorded: length of terminal shoot, number of leaves per terminal shoot, leaf area, number of panicles per terminal shoot, length and breadth of panicle, total number of panicles per plant, number of fruits retained per panicle at 10 day intervals starting from pea stage up to harvest, date of harvest, number of fruits per plant, fruit weight, fruit length, breadth and thickness, stone and skin weight, yield per plant, shelf life and TSS. The recorded data on different parameters of the experiment were tabulated and analyzed and the treatment means were separated by Least Significant Difference (LSD) test at 5 % level of significance.

Source of Information: Research Report on Horticultural Crops 2012-13. Horticulture Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 22000/-

Total Budget (Tk.) : 22000/-

Achievement/Findings:

Plants soil drenched with paclobutrazol was found effective against alternate bearing habit. Mango plants (cv. Langra) treated with paclobutrazol at 4500 ppm exhibited the highest number of fruits as well as yield compare to untreated control. In the control treatment, very few fruits were observed which might be due to the off year of the variety. But the paclobutrazol treated plants irrespective of concentration had profuse flowering and fruiting.

Knowledge Management: Report/Proceedings