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Evaluation of Different Mulches for Enhancing Lac Production in Ber Under Rain Fed Condition in Bangladesh

M. E. A. Pramanik
OFRO, Rajshahi

M. A. Salam,
OFRO, Rajshahi

M. M. Rahaman
OFRO, Rajshahi

K. K. Roy
OFRO, Rajshahi

Abstract/ Executive Summary:

The study was undertaken at Farming System Research and Development (FSRD) site, Kadamshahor, Godagari, Rajshahi during 2013-2014 at baishakhi lac crop season to evaluate the performance of different mulches on yield potentiality of lac. The lowest mortality of lac (83. 71%) and the highest yield (6.9 kg/tree was obtained from black polyethylene mulch). On the contrary, the highest mortality of lac (89.13%) and the lowest yield (2.53 kg/tree) was obtained from cotrol treatment. Black polyethylene mulch conserved the highest soil moisture. Soil temperature was found to be the highest under white transparent polyethylene mulch while the lowest temperature was recorded from control. Observations on weed biomass indicated that black polyethylene was superior over other mulch materials.

Keywords: Evaluation,Mulches,Lac production, Ber, Rainfed condition

Location: Farming System Research and Development (FSRD) site, Kadamshahor, Godagari, Rajshahi

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Conservation and Biodiversity

Commodity: Silkworm

Objectives:

To evaluate the performance of different mulches on yield potentiality of lac.

Methodology:

The investigation was carried out at FSRD site, Kadamshahor, Godagari, Rajshahi during 2013- 2014 at baishakhi lac crop season to observe the yield potentiality of lac and to evaluate the performance of different mulches on soil moisture retention, soil temperature and weed suppression in High Barind Tract. Four mulch materials viz., black polyethylene, white transparent polyethylene, straw mulch and dust mulch were evaluated for assessment of soil moisture retention, soil temperature, weed suppression and lac yield (rangeeni baishakhi season crop on ber). Soil moisture content was evaluated for two depths i. e., 0-30 em and 31-60 em for all the treatments during November to April. Soil temperature data was also recorded for the same period. Weed samples were collected before imposition of the mulch materials and after harvesting of rangeeni lac crop on ber for determination of weed reduction under treatments. The experiment was laid out in a randomized complete block design with 3 replications and 5 treatments. One host plant was considered as one replication of the treatment and all the plants were about IS years old. Pruning was done for lac host at the April 2013 for baishakhi lac crop season. rPuning of host plants was necessary to get the maximum number of soft and succulent shoots that facilitate feeding of the lac insects and provide maximum space for settlement on the plants for obtaining a successful and bumper crop. Seeds were collected from the same host and seed rate was 50 sticks (each stick of I feet length) per plant. During inoculation, the brood lac sticks were tied onto the host branches both vertically and horizontally to get full inoculation in the young shoots. After 7 days, when the inoculation was complete, the seed sticks bearing the lac were collected from said host plants and brought to the store for collection of stick lac (raw lac). After complete settlement of the nymphs on young shoots, the number of nymphs/cells was recorded separately from 10 em length of the randomly selected 5 shoots. Harvesting of lac was done at the last week of April. After harvest, the lac crops were scrapped-off from the collected lac sticks by sharp knives and the fresh weight of stick lac was recorded. The data were then analyzed statistically and mean separation was done by DMRT.

Source of Information: Annual Research Report, Entomology Division, BARI,2013-2014

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The economic analysis of the experiment exhibited that treatment black polyethylene produced the maximum gross margin of 540500 Tk. ha^-1although its variable cost was 156350 Tk. ha^-1 The second highest gross margin, 405750 Tk ha^-1 was obtained from treatment white transparent polyethylene and the lowest 106500 Tk. ha^-1from control plot. This variation occurred due to the variation of lac yield different management. On the other hand, the maximum BCR (4.45) was found in treatment black polyethylene that was closely followed by treatment white transparent polyethylene (3.59). Karim et al. (1994) reported that farmers always try to maximize their returns up to the point where returns to investment are the highest as the capital is scarce. Thus farmers of the area may be advised to go for treatment black polyethylene. Considering BCR, treatment black polyethylene was found economically profitable and viable among the other treatments for the cultivation of lac in the High Barind Tract soil.

Knowledge Management: Report/Proceedings