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A Iysimeter Study on the Evaluation of Loss of Sulphate from Soils Fertilised with Phosphorus in a Rice-based Cropping System

S. A. HAQUE
Department of Soil Science, BAU, Mymensingh

Abstract/ Executive Summary:

An experiment was carried out in a silty loam Non-calcareoua Dark Grey Floodplain soil in lysimeters at Bangladesh Agricultural University to study the loss of S in leachates and S balance for rice in a rice-based cropping system. There were three fertilizer treatments viz. control, 60 kg P₂O₅ ha^-1 and 120 kg P₂O₅ ha^-1. The treatments were replicated thrice using a randomized block design. Nitrogen, potassium. sulfur and zinc were applied basally. A HYV rice BR2 (Mala) was used in the experiment. lt was found that rain water contributed 12.51 kg ha^-1 S, while S received from the irrigation water during the experimental period was 15.73 kg ha^-1. The leaching loss of S due to phosphorus application at the rate of 60 kg P₂O₅ ha^-1 and 120 kg P₂O₅ ha^-1 were 3.79 kg ha^-1 and 12.65 kg ha^-1 respectively over the control treatment. Sulphur uptake was highest in P₆₀ treatment, which was 10.93 kg ha^-1 followed by the control (7.22 kg ha^-1) and P₁₂₀ treatment (6.57 kg ha^-1). The highest grain yield 4210 kg ha^-1 was obtained in P₆₀ treatment, which showed an increase of 630 kg ha^-1 grain yield over control while P₁₂₀ treatment resulted in a decrease of grain yield (112 kg ha^-1). A negative S balance for rice was obtained, when the balance sheet was drawn using S inputs and S losses. The sulphur balance was -8.07 kg ha^-1 and -12.57 kg ha^-1 when phosphorus was applied at the rate of 60 kg ha^-1 and 120 kg ha^-1 respectively.

Keywords: Lysimeter. P fertilizer, Leaching loss of S, S-balance.

Location: BAU, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

An investigation using Iysimeter on leaching loss of S and S balance for rice under high rates of phosphorus application.

Methodology:

The experiment was carried out in lysimeters. Nine Iysimeters were set up using oil drums with typical rice growing soil profile of Non-calcareous Dark Grey Floodplain (classified as Haplaquept). There were three rates of phosphorus fertilizer used in the experiment viz. 0, 60 and 120 kg. P₂0₅ ha^-1. One- third of nitrogen with full dose of potassium, sulfur and zinc were applied at the rate of 80 kg N ha^-1, 40 kg K₂0 ha^-1, 20 kg S ha^-1 and 5 kg Zn ha^-1 respectively. Remaining two-thirds of nitrogen were applied in equal installments at the tillering and panicle initiation stage. Urea, TSP, MP, Gypsum and Zinc Oxide were used as the sources for nitrogen, phosphorus. potassium, sulfur and zinc respectively. There were three fertilizer treatments used in the experiment and each treatment was replicated thrice. The experiment was carried out in a randomized block design. Thirty days old seedlings were used in the experiment. Two seedlings were transplanted in each hill with a distance of 15 cm between each hills and rows. A HYV rice BR2 (Mala) was used in the experiment as the test crop.

Source of Information: Proc. BAU Res. Prog. 5: 113-128, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded from the above Iysimeter studies that soil requires an additional supplementation of S, when phosphorus is applied particularly at higher rate to offset its effect on leaching loss of S in rice production.

Knowledge Management: Report/Proceedings