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Tissue Concentration of Nutrients and Quality of Rice Grains as Influenced by Various Amendments in an Acid Sulfate Soils

S. RAHMAN
Department of Soil Science, University of Dhaka, Dhaka 1000, Bangladesh.

H. R. KHAN
Department of Soil Science, University of Dhaka, Dhaka 1000, Bangladesh.

M. M. RAHMAN
Department of Soil Science, University of Dhaka, Dhaka 1000, Bangladesh.

Abstract/ Executive Summary:

Effects of leaching, CaC0₃, basic slag, Mn0₂ and phosphorus on the mineral nutrition and quality of rice in acid sulfate soils were studied in a green house. Leaching plus basic slag at 25 t ha -1 was found to be the best with respect to protein content of rice grain and nitrogen in plant tissue. Phosphorus, Ca and Mg concentrations were found to be highest with leaching plus lime at 15 t ha -1 (TIS) treatment but the peak value of K was recorded in T5 (basic slag at 15 t ha -1) treatment. Leaching, lime, basic slag and phosphorus applied alone or in combination were found to be effective in decreasing Fe. Mn and Zn concentrations in plant tissue. Lime, basic slag and Mn0₂ also had decreasing effects (significant at P=0.01 level) in tissue concentration of sulfur. Lowest values of all the nutrients were recorded in the control (To) except for S concentration in rice plant. The same trends of nutrient status were found at all stages of growth of rice. Hence. leaching at different degrees and other improved treatments should be practiced for the remedy and improvement of acid sulfate soils as well as balance supply of nutrients to plants to obtain better quality of rice.

Keywords: Acid soil, Quality of rice, Nutient, Leaching

Location: Greenhouse of the Department of Soil Science, University of Dhaka, Bangladesh

Start Date: 00-03-1990

End Date: 00-07-1990

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

A number of attempts have been undertaken to make these soils productive. Among these, the use of lime (CaC0₃), basic slag, phosphorus, Mn0₂ and leaching alone or in combination might be practiced for better quality of rice and balanced supply of nutrients to plants.

Methodology:

The study was conducted in the greenhouse of the Department of Soil Science, University of Dhaka, Bangladesh during March to July, 1990 with T. Aus rice (BR-3) as test crop. The bulk soil (0-15 cm) of Cheringa series Silty clay was collected from the village Mahynnapitkhali of Cox's Bazar region (Chakaria upazila). Soil samples were air- dried, ground and passed through a 5 mm sieve. The experiment had 18 treatments and 3 replications for each treatment. The experiment was set up by following completely randomized design and the treatment combinations were as follows: Control-, (To) Where no amendments were made; P90, (TI) Phosphorus as P₂0₅ at 90 kg; P120, (T2) Phosphorus as P₂0₅ at 120 kg; 1m₁₀ (T3) Lime (CaC0₃) at 10t; 1m₁₅ (T4) Lime (CaC0₃) at 15t; B15, (T5) Basic slag² at 15t; B₂₅, (T6) Basic slag at 15t; Mn₁₀₀, (T7) Mn0₂ 100 kg; Mn₁₅₀, (Tg) Mn0₂ at 150 kg; 1m₁₀ Mn₁₀₀, (T9) Lime at 10 + Mn0₂ at 100 kg; 1m₁₅ Mn₁₀₀, (T9) Lime at 10 + Mn0₂ at 100 kg; P90 1m10, (T11) Phosphorus at 90 kg + lime at 10t; P901m15, (T12) Phosphorus at 90 kg + lime at 15t; Leaching L, (T13) Leaching with tapwater to decrease the EC value around 2 dSm -I; L + 1m10, (TI4) Leaching + Lime at 10t; L + 1m15, (TI5) Leaching + Lime at 15t; L + B15, (T16) Leaching + Basic slag at 15t; L + B25, (T17) Leaching + Basic slag at 25t ha+, Two hundred and fifty grams of coarse sand, pretreated with HCl, then washed with tap, and distilled water was added first to each of the plastic pots (25x20x16 cm capacity) and 5 kg soil sample was placed in each pot. Basal doses of N and K₂0 were used at 100 and 40 kg ha-1 from Urea and Muriate of potash (MP), respectively. The whole of MP and half of the Urea were applied during pot preparation. The remaining Urea was applied in two splits, one at active tillering and another at panicle initiation stage. A level of 5 cm of water was maintained regularly by adding tap water whenever necessary. Thirty five days old healthy and uniform seedlings at 2 plants per hill two hills per pot were transplanted and intercultural operations were performed as required. One plant per pot was sampled at 30, 60, 90 and 130 days form transplantation. The periods corresponds early tillering stage (ETS), maximum tillering stage (MTS), Panicle initiation stage (PIS) and harvesting stage (Har). The plants were harvested each time at 1 cm above the soil surface and these were analysed for nutrient contents in tissues and protein content of rice grains after proper drying. Total nitrogen in the plant tissues and grains were determined by Micro-Kjeldahl method (9). Total contents of P (Spectrophotometrically at 660 nm wave length after developing yellow colour (9), K (Flame photometrically at 767 nm filter), S (10) Ca, Mg, Fe, Mn and Zn were determined by using Pye UniCam-SP 9 Atomic Absorption Spectrophotometer in HN0₃- HC10₄ acid (2: 1) extract.

Source of Information: Dhaka University Studies, Part E, 6(2): 139-147, 1991 (July)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Leaching at different degrees and other improved treatments should be practiced for the remedy and improvement of acid sulfate soils as well as balance supply of nutrients to plants to obtain better quality of rice.

Knowledge Management: Report/Proceedings