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Effect of Dehaulming on Yield of Seed Potatoes

A. A. MAHMUD
Tuber Crops Research Centre, BARI, Joydebpur, Gazipur.

SAJEDA AKHTER
Tuber Crops Research Centre, BARI, Joydebpur, Gazipur.

M. J. HOSSAIN
Research Wing, BARI, Gazipur

M. K. R. BHUIYAN
RHRS, Jaintapur, Sylhet, Bangladesh.

M. A. HOQUE
Tuber Crops Research Centre, BARI, Joydebpur, Gazipur,

Abstract/ Executive Summary:

The yield of seed size tubers was assessed in five standard potato cultivars (Cardinal, Multa, Ailsa, Heera, and Dheera) in relation to dates of dehaulming (65, 70, and 80 days after planting) in a Seed Potato Production Farm, Debijong, Panchagarh during 1996-97 and 1997-98. Dehaulming at 70 days gave maximum seed size tubers (19.75 t/ha ≈ 76%) but significantly identical to 75 days (19.56 t/ha ≈70%) and 80 days (18.69 t/ha ≈ 63%). Considering all the parameters studied, the performance of Heera proved to be best among the cultivars grown. Among the cultivars, the maximum seed tuber yield was recorded from Cardinal at 80 DAP followed by Heera and Cardinal at 70 DAP, Dheera and Ailsa at 75 DAP. In general, most of the cultivars gave the maximum seed tuber yield when the crop was dehaulmed at 70 and 80 DAP and the lowest from 65 DAP.

Keywords: Dehaulming, Potato, Seed production

Location: Debiganj, Panchagarh

Start Date: 00-00-1996

End Date: 00-00-1998

Program Area: Crop-Soil-Water Management

Commodity: Potato

Objectives:

To increase the proportion of seed size tuber through dehaulming at appropriate time.

Methodology:

The experiment was conducted at the Seed Potato Production Farm, Debiganj, Panchagarh of AEZ 3 during 1996-97 and 1997-98. The treatments were 5 (five) cultivars, such as Cardinal, Multa, Heera, Ailsa, and Dheera and 4 (four) dates of dehaulming (65, 70, 75, 80 DAP). Seed size (40-60g) whole tubers were planted at 60 cm x 30 cm spacing on 18 November 1996 and 15 November 1997. The unit plot size was 3m x 3m. The initial nutrient status of soils of the experimental plots was 17, 9, 3, and 6 µg/ml of NH₄-N, P, Zn, and S, respectively, and 0.10, 1.9, and 0.65 meq/100 ml of K, Ca, and Mg, respectively, and organic matter was 0.73%. The pH of the soil was 6.4. The soil type of the experimental site was sandy loam and the crops were fertilized @ 250 kg urea, 220 kg TSP, 200 kg MP, 120 kg Gypsum and 6 kg boric acid per hectare. Full dose of TSP, MP, Gypsum, boric acid, and one half of urea were applied during land preparation and the rest one half of urea was side dressed during first earthing up and weeding operations, 30 days after planting (DAP). The crops were irrigated four times and were regularly sprayed at 10 days interval with 0.2% desis. The experiment was conducted in a factorial randomized complete block design replicated thrice. The crops were harvested after 10 days of haulms cutting. Data on seed yield of seed tubers and yield attributes were recorded and analyzed statistically.

Source of Information: Bangladesh J. Agril. Res. 34(3) : 443-448, September 2009, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results show that the crop should be allowed to grow 70 to 75 days for achieving the highest seed sized tuber yield as well as the number of seed tubers. Haulms can also be killed at 65 or 75 days without sacrificing much of number and seed sized tuber yield. It could expose the crop to a lesser period to diseases and pests which results in healthy seed crop.

Knowledge Management: Journal