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Preparation of Upazila Land and Soil Resource Guide, Dighalia Upazila, Khulna

Shachindranath Biswas
Scientific Officer
SRDI, Khulna

N. M. Jahangir
Scientific Officer
SRDI, Khulna

Abstract/ Executive Summary:

Dighalia is situated in the north-eastern part of Khulna district. It lies between 22º51´ and 23º00´ north latitude and 89º31´ and 89º37´ east longitude and covers an area of 6,872 ha. It lies in the agro-ecological zones of Ganges River Floodplain (Physiographic unit 8 as of Brammer1996, AEZ 12), Ganges Tidal Floodplain (Physiographic unit 9, AEZ 13, Low Ganges River Floodplain) and Gopalganj-Khulna Bils (Physiographic unit 10, AEZ 14). The upazila comprises of 4 unions having a population of 114,460 (2001). Three land types namely highland, medium highland and medium lowland were identified. The textural classes were loam, clay loam, clay and peat. Seven soil groups were identified. Total 59 soil samples were collected and analyzed. Ganges Floodplain soils are deficient in N, P and Zn; and Ganges Tidal Floodplain and Peat soils deficient in P. Seven major cropping patterns were found. Fertilizer recommendations for suitable crops are given. Dighalia upazila was first surveyed in 1989 and updated in 2005.

Keywords: Land, Soil, Crops, Upazila,Guide

Location: Dighalia Upazila, Khulna

Start Date: 30-03-1989

End Date: 30-04-2005

Program Area: Crop-Soil-Water Management

Commodity: Land management

Objectives:

1. Land and soil resources inventory of Dighalia Upazila

2. Soil fertility assessment and fertilizer recommendation.

3. Crop suitability assessment.

4. Preparation of land and soil resource utilization guide with soil and landform map.

Methodology:

Field survey was conducted on the basis of semi-detailed soil survey method. Interpretative soil and landform map was prepared using 1:50,000 aerial photographs. Soils were investigated following a catena and composite top soil samples were collected. The sampling frequency were 1 (one) sample per 200 ha, although more samples were taken wherever necessary according to complexity of soils. During survey crops, cropping patterns, soil management data were collected by physical observations and interviewing the farmers. Soil samples were analyzed for fertility assessment. Crop suitability for each land type was determined. Fertilizer recommendations for suitable crops were made. Final soil and landform map was made from the interpretative field map through verification by ground truthing and field checks. After compiling physical and chemical data sets the land and soil resource utilization guide was prepared.

Source of Information: Land and Soil Resources Utilization Guide, Dighalia Upazila, Khulna, 2005, SRDI, Dhaka-1215.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 110,000

Total Budget (Tk.) : 110,000

Achievement/Findings:

Major land types recognized were medium lowland (27.9%), medium highland (25.5%) and highland (12.2%). Major textural classes identified clay (42.9%), clay loam (10.5%) and peat (9.5%). Major soil groups identified Ishurdi (20%), Gopalpur (10.4%), Ghior (13%), Barisal (10%) and Harta (7.6%). Suitable crops were rice (boro, T. aman, deep water aus and aman), sugarcane, wheat, rabi cotton, gram, lentil, mustard, rabi soybean, groundnut (rabi and kharif), potato, rabi vegetables, rabi chilli, tomato, cabbage, mango, jackfruit, coconut. Major cropping patterns were Sesame/Fallow(F)-Mixed B. aus & aman (13.3%); Boro (HYV)-Prawn (11.1%); Boro(HYV)-F (7.1%); F-B.aman (6.5%); Sesame/F-T.aman (5.9%). Fertilizer recommendations for 36 existing and potential crops of the upazila at high and medium yield goals are given. Ganges Floodplain soils are deficient in N, P and Zn; and Ganges Tidal Floodplain and Peat soils deficient in P. This guide can be used for determining flood, drought, water-logging, salinity and soil erosion. Demonstration site selection for technology transfer can be done with the help of this guide. Upazila land and soil resource's carrying capacity can be estimated which would help in determining food deficit or surplus situation.

Knowledge Management: Report/Proceedings