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Soil Fertility and Leaf Nutrient Status of Litchi Orchard Sites

Tasnim Zannat
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

Farhana Firoz Meem
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

Rubaiat Sharmin Promi
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

Umme Qulsum Poppy
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

MK Rahman
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Twelve soil and twelve leaf samples were collected from twelve litchi (Litchi chinensis Sonn.) orchards from different locations of Dinajpur to evaluate some Physico-chemical properties and nutrient status of soil, and concentration of nutrients in litchi leaf. The pH of the soil varied from very strong acidic to medium acidic (4.8 - 5.7), organic matter content varied from 0.84 - 1.88%, EC varied from 302.4 - 310.2 μS/cm. The dominant soil textural class was clay loam. The average particle density was 2.49g/cm3. Total N, P, K and S in soils were 0.053 - 0.180%, 0.02 - 0.07%, 0.046 - 0.370 meq/100 g, and 0.015 - 0.028%, respectively. Available N, P, K, S, Zn, Fe, Mn and B in soils 30.40 - 57.8 mg/kg, 10.53 - 14.33 mg/kg, 0.03 - 0.32 meq/100 g, 20.03-34.80 mg/kg, 0.68-1.50 μg/g, 31.8 - 41.5 μg/g, 6.75 - 7.39 μg/g and 0.25-0.51 μg/g, respectively. The concentration of total N, P, K, S, Zn and Mn in the leaf were 1.74 - 2.20%, 0.11 - 0.188%, 0.104- 0.198%, 0.129 - 0.430%, 12 - 14 μg/g and 30 - 74 μg/g, respectively. The overall results indicated that the fertility status of the soils under the litchi plantation in the Dinajpur area is medium fertile. So, farmers could be advised to grow litchi plants after applying amendments to the soils to improve the Physico-chemical properties in the Dinajpur area of Bangladesh.

Keywords: Fertility of soils, Nutrients, Litchi orchards, Leaf

Location: Dept. of Soil, Water and Environment, University of Dhaka.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility, Litchi

Objectives:

To assess the fertility status of some litchi orchard soils and the concentration of nutrients in the leaves of litchi plants.

Methodology:

The study area was Dinajpur which belongs to the old Himalayan piedmont plain (AEZ-1). Twelve soil (0-15 cm depth) and 12 leaves (terminal, green coloured) samples were collected from different sites of Dinajpur. Soil samples were air-dried, visible roots and debris were discarded, massive aggregates were broken by using a wooden hammer and sieved using a 2 mm sieve. Samples were kept in polyethylene bags with proper labeling. Leaf samples were collected from the same locations, labeled and carried to the laboratory in the Dept. of Soil, Water and Environment, University of Dhaka. In the laboratory, it was wiped with soft clothes, air-dried, oven-dried (650C) and powdered with a mechanical grinder and kept in brown paper envelopes for analysis. Textural analysis of soils was done by hydrometer method(9) and the textural class was determined from Marshall’s triangular coordinate following the USDA system. A glass electrode pH meter calibrated with buffer pH 7.0 and 4.0 measured the pH of the soil suspension maintaining soil: water ratio of 1:2.5. Available nitrogen in soil samples was determined by Kjeldahl method(10), available phosphorus was determined colorimetrically by spectrophotometer after developing blue color using ascorbic acid and potassium antimony tartrate as color developing reagents, exchangeable potassium in soil was determined by the extraction with ammonium acetate (pH 7.0) using a flame photometer, available sulphur was determined by turbidimetric method with BaCl₂ using Tween-80 as the suspending agent of the sulphate precipitation. Total nitrogen in the soil samples was determined by the micro-Kjeldahl steam distillation method after H₂SO₄ acid digestion (11). For the determination of total P, K and S samples were digested with a mixture of concentrated HCl/HNO₃ (1:3). Total phosphorus was determined by spectrophotometer using vanadomolybdophosphoric yellow color method(12), total potassium was measured by a flame photometer and total sulphur was determined by spectrophotometer after developing turbidity with BaCl₂. The concentrations of total and available iron, boron, manganese and zinc were determined using an atomic absorption spectrometer (AAS) (VARIAN AA240). Standard errors are shown for leaf sample analysis.

Source of Information: Dhaka Univ. J. Biol. Sci. 30(2): 141-149, 2021 (July)

Article Link (Online Journal): DOI: https://doi.org/10.3329/dujbs.v30i2.54640

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall results indicated that the fertility status of the soils under twelve litchi orchards is moderately fertile in Dinajpur area.

Knowledge Management: Journal