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Response of Boro Rice to Potassium Application in Two Soils of Bangladesh

A. H. M. Razzaque
Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh, Bangladesh

M. Idris Ali
Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh, Bangladesh

A. K. M. Habibullah
Bangladesh Institute of Nuclear Agriculture, P.O. Box 4, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Glass house and field experiments were conducted during 1984-85 and 1985-86 to find out the deficiency of potassium in Ghatail and Lokdeo series soils in order to determine the optimum requirement of potassium for HYV boro rice, IRATOM-24. In glass house experiments, sorghum and rice were used as test crops. Both Ghatail and Lokdeo series soils were found deficient in potassium. Between sorghum and rice, sorghum was a better indicator for potassium deficiency. Results of field experiments indicated a significant influence of potassium on IRATOM-24 in both soil series. In Ghatail soil, the yield of grain was increased with the application of potassium at the rate of 50 kg K20/ha and subsequent increase of potassium reduced the yield. The highest straw yield was recorded with 100 kg K20/ha. In Lokdeo soil, the grain yield increased from 3 to 4.7t /ha with 50 kg K20/ha indicating significant response of rice to K fertilizer. Although identical with 50, 100 and 150 kg K20/ha, the highest straw yield was recorded with 200 kg K20/ha.

Keywords: Roro rice, Potassium, Soil, Glass house

Location: Ghatail and Lokdeo soil series were collected from Jamalpur and Mymensingh districts, Bangladesh

Start Date: 00-00-1984

End Date: 00-00-1986

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Rice

Objectives:

To evaluate the potassium fertility of two soils in the laboratory and glass house and to correlate the predicted fertility with the response of rice in fields to added potassium in two different soils of Bangladesh

Methodology:

Two soil samples representing Ghatail and Lokdeo series were collected from Jamalpur and Mymensingh districts for laboratory and glass house studies. The samples were sent to the Agro-services. The elements which were found deficient in the soils were corrected for optimum plant growth except potassium. The amount of elements added to the optimum treatment were about three times the deficiency critical level. Based on the results of glass house study, two field experiments were carried out during boro rice season to determine the optimum level of potassium to maximize rice yield. The locations .were cropping system research site of Bangladesh Agricultural Research Institute at Lahirikanda, Jamalpur and Kahnar, Mymcnsingh representing Ghatail and Lokdeo series respectively. The rice variety used in both experiments was IRATOM-24. The fertilizer doses used were 100 kg N 100 kg P20s, 30 kg Sand 5 kg Zn per ha supplied as urea, TSP, Gypsum and zinc sulphate respectively.The levels of potassium were 0, 50, 100, and 200 kg K 20/ha from MP. The experiment was laid out in a randomized block design with four replications. The whole amount of TSP, Gypsum, Zinc and half of urea were applied at the time of final land preparation.The rest of urea was ap plied in two splits. The row to row and hill to hill distance were 25 cm and 10 cm respectively. All other agronomic practices were carried out as and when necessary.The crop was harvested at full maturity and data on grain and straw yield per hectare were recorded.

Source of Information: Bangladesh J. Soil Sci. 21(1):26-29,1990, ISSN 0253-5440

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results of field experiments indicated a significant influence of potassium on IRATOM-24 in both soil series. In Ghatail soil, the yield of grain was increased with the application of potassium at the rate of 50 kg K20/ha and subsequent increase of potassium reduced the yield. The highest straw yield was recorded with 100 kg K20/ha. In Lokdeo soil, the grain yield increased from 3 to 4.7t /ha with 50 kg K20/ha indicating significant response of rice to K fertilizer. Although identical with 50, 100 and 150 kg K20/ha, the highest straw yield was recorded with 200 kg K20/ha.

Knowledge Management: Journal