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Corection of Acidic Mulberry Soil and Corresponding Feeding Effects of Leaves on Cocoon Quality

A A Sarkar
BSRTI, Rajshahi

M T Haque
BSRTI, Rajshahi

M A Rab
BSRTI, Rajshahi

M R Haque
BSRTI, Rajshahi

N Absar
Rajshahi University

Abstract/ Executive Summary:

Four doses of lime (CaO) and four doses of ash (cowdung+rice husk) were applied lo the acidic soil of pll 5.50 to study the feeding effects of mulberry leaves on cocoon quality of silkworm, Bombyx mori L. Progressive and significant increase in soil pH and nutritional components of mulberry leaves were observed due to (he application of lime or ash except for crude fibre and mineral contents. Larval weight, cocoon yield, single cocoon and shell weight, filament length and denier were significantly increased with the increase in the doses of lime or ash. The dose 1600kg lime/ha or 6500 kg ash/ha was recommended for correcting acidic soil of pH 5.50 inorder to improve the nutritive value of mulberry leaf for quality cocoon production.

Keywords: Mulberry, Acdic Soil

Location: Bangladesh Sericulture Research and Training Institute

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Mulberry

Objectives:

To study the effects of feeding mulberry leaves raised in acidic soil under treatments of lime and ash on cocoon production of silkworm Bombyx mori L.

Methodology:

The experiment was conducted al the Sericultural Nursery, Bogra on a red sandy clay loam soil of pH 5.50. Ten year old mulberry trees (variety BM-1) were selected for the study. The following doses of lime and ash were used : T0 (Control) = No lime, no ash. T1 = 800 kg lime/ha T2 = 1200 kg lime/ha T3 = 1600 kg lime/ha T4 = 2000 kg lime/ha T5 = 3500 kg ash/ha T6 = 5000 kg ash/ha T7 = 6500 kg ash/ha T8 = 8000 kg ash/ha Lime (CaO) and ash (cowdung+rice husk) were applied to the soil up to the depth of 30 cm. Organic manure was applied to all the plots at the rate of 20 mt/ha. A blanket fertilizer dose of 250 kgN, 125 kg P, and 75 kg K/ha/year were used in four split doses. All the plots were irrigated regularly at 15 days interval, Normal cultural operations were done as and when needed. Composite soil samples were collected form each plots and soil pH was determined using a pH meter equipped with a glass electrode. The nutrient components of the leaves such as water, protein, total sugar, soluble carbohydrate, minerals and crude fibre contents were determined in four silkworm rearing seasons such as Chaita (February-March), Taistha (May-June), Bhaduri (August) and Aughrani (October-November) according to the methods of Krishnaswami (1978). Silkworm race BSRI-85/3 (improved multivoltine) was used. Two dfls were brushed for each treatment. After second moult they were divided into three replications of 100 worms each. All the lots were fed with equal quantity of leaf at an interval of about 6 hours. Data were recorded for larval weight, effective rate of rearing, cocoon yield, single cocoon weight, single shell weight, filament length, renditta and denier.

Source of Information: Bulletin of Sericulture Research 1993 vol4:41-44 Published by Bangladesh Sericulture Research and Training Institute.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The result obtained in the present investigation, therefore, suggest that both lime and ash have significant effect in increasing soil pH and improving the leaf quality of mulberry as well as the cocoon quality. It is also clearly evident from the experiment that the dose 1600 kg lime/ha or 6500 kg/ha produced superior quality of cocoons. Hence, the above dose of lime or ash may be recommended for correcting acidic soil of pH 5.50 for improving the leaf quality of mulberry and ultimately to boost up the quality cocoon production in the country.

Knowledge Management: Journal