Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Fractionation of Potassium in Soil Amended with Organic and Inorganic Fertilizers

Sultana Bilkis
Ph.D Fellow
Department of Soil Science, BAU, Mymensingh

Mian Md Joynal Abedin
Professor
Department of Soil Science, BAU, Mymensingh

Islam Md Rafiqul
Professor
Department of Soil Science, BAU, Mymensingh

Mosleuddin Abu Zofar Md
Professo
Department of Soil Science, BAU, Mymensingh

Abstract/ Executive Summary:

A laboratory experiment was conducted from October 2001 to October 2002 with silt loam alluvial soils of a permanent manurial experimental field at Bangladesh Agricultural University Farm, Mymensingh to evaluate the influence of long-term intensive fertilization on the distribution of P and K in different fractions of soils. There were 10 treatments viz. O (control), N. NP, NK, NS, NZn, NSZn, NPKSZn and N + FYM. Soil samples were collected from two depths i.e. 0-10 cm and 10-20 cm of three replicated plots of each treatment. They were dried in air, ground and sieved through a 10-mesh sieve. Composite soil samples were prepared by mixing samples of three replicated plots. Water-soluble, exchangeable and non-exchangeable K were extracted with distilled water, IN NH₄OAC and HNO₃ respectively. All forms were higher in K treated plots than the non-treated plots. Non-exchangeable K was the highest among the forms studied. The amount of K was highest in the subsurface soils than in surface soils because of higher bulk density, lower uptake by crops and deposition from surface soils. All the forms of K showed very weak to strong correlation between the fractions studied indicating their interdependence.

Keywords: Long-term fertilization, K fractions, Soils, Better soil, Fertilizer, Crop management.

Location: A permanent manurial experimental field at Bangladesh Agricultural University Farm, Mymensingh, Bangladesh

Start Date: 00-10-2001

End Date: 00-10-2002

Program Area: Crop-Soil-Water Management

Commodity: Organic fertilizer, Fertilizer

Objectives:

To evaluate the influence of long-term fertilization on K fractions in soils for better soil, fertilizer and crop management.

Methodology:

The study was conducted in the laboratory with typical rice growing soil of permanent experimental plot of Bangladesh Agricultural University Farm, Mymensingh in order to evaluate the effect of long-tern application of manure and fertilizers on soil fertility and to separate different farms of soil potassium. This silt loam soils of the experimental plots belong to the Sonatola series under the local general soil type of non-calcareous dark grey floodplain alluvium. The soils were developed on the old Brahmaputra river-borne alluvial deposits under the combined influence of surface and groundwater. Initial soil pH was 6.8 organic matter content 1.25%, available potassium content was 0.20 cmol kg^-1 (1978). There were 10 treatments in this experiment. Viz.: 0 (no fertilizer added) N, NP, NK, NS, NZn, NPK, NSZn, NPKSZn, and NFYM. The rate of N, P, K S and Zn were 70, 20, 19, 30 and 8 kg ha^-1 respectively and the fertilizer sources of these nutrients were urea, TSP, MP, CaSO₄ 5H₂O, ZnSO₄, H₂O respectively. These fertilizers are used regularly for the last 24 years from 1978 to 2002. Soil samples were collected at 10 cm and 10-20 cm depths from 5 spots of three replicated plots of each treatment.

Source of Information: BJPST: 12(1):071-074, January, 2014; ISSN : 2305-1809 (Online version)

Article Link (Online Journal): https://www.researchgate.net/publication/330565087

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results presented in table 4 indicate that the grain yield of rice varied from = 3.5 to 11 t ha-1 yr -1 (Aus + Aman together). To get this yield, according to Islam (1998) it requires almost 70 to 220 kg K ha^-1 yr ^-1. The water-soluble and exchangeable K content of soil material up to the depth of 10 cm varied from 42 to 55 kg ha^-1 which is much below the total requirement of crops. The ?est ≈ 24 to 165 kg K is being taken up by crop mainly from soil. This amount is made available, for use by the growing crops, through physical as well as chemical weathering of soil materials. The initial exchangeable K content of soil of the present study was 78 mg kg^-1 in 1978. During the last 24 yrs this concentration has been reduced only 30 to 40 mg kg^-1 in 2002. This data also indicated that the K fertility is decreasing tremendously in this soil. The trend of water-soluble and exchangeable K of surface and subsurface soils showed a good relation with the non-exchangeable K. It means that when the water-soluble and exchangeable K are exhausted due to strong uptake by the growing crops, the non-exchangeable K become available probably through weathering of soil material or through ion-exchange phenomenon. Khanom (2000) reported after a sorption study with Old Brahmaputra Floodplain soils that NH₄ ⁺ and Ca²⁺ suppressed K ⁺ sorption in soil but when Ca²⁺ concentration is increased the sorption of both K⁺ and NH₄ ⁺ are suppressed. As the soil of Old Brahmaputra Floodplain contained K bearing mica type of clay mineral, it seems possible that under wetland condition the NH₄ ⁺ formed from the hydrolysis of the applied N fertilizers (urea) produce a lot of ammonium in soil solution (Clothier et al. 1986 and Blume, 1985). This NH₄ ⁺ and the Ca⁺² (supplied with TSP, Gypsum and inherent) probably displaced K from interlayer spaces of clay minerals and make the K water-soluble hence, available to the plants. A part of this displace K is also adsorbed by the soil particles and the rest is lost through leaching with percolation water as a result of which the K status decreased tremendously in soils.

Knowledge Management: Journal