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Impact of Micronutrients on the Available Nitrogen After Incubation of Soils

A .R. Sarkar
Department of Chemistry Bangladesh Agricultural University, Mymensingh-2202, Bangladesh..

A.K. Chowdhury
Department of Agricultural Chemistry, Bangladesh Agricultur al University, Mymensingh-2202, Bangladesh..

Abstract/ Executive Summary:

The Brahmaputra alluvial soil (Digarkanda series) were incubated at 30°C and at mo1sture levels of 50% and 133% mwhc (Maximum water holding capacity) mixing with 50 ppm each of Fe. Cu. and Zn and 20 ppm each of B, Co, and Mo to study the impact of micronutrients on the available nitrogen after 3, 6 and 12 v:-'eeks of incubation. During aerobic condition (50% mwhc) all the addedelements decreased ammonification (NH4·N) after all periods except Zn and Cu. Zinc increased ammonification after 6 weeks and Cu after 12 weeks. Nitrification (N03-Nl on the otherhand wasstimulated by Cu. B and Mo after 3 weeks. With other added elements nitrification was much favoured after 6 and 12 weeks except Zn, which increased nitrification after 12 weeks only. Under anaerobic condition ( 133% mwhc) ammonification was stimulated by Co after all the periods and B after 6 and12 weeks. Whilst all the added elements favoured ammonification after 12 weeks only. But nitrification was stimulated by all the added ele ents up to 6 weeks. A fter 12 weeks only Fe incr eased nitrification and the other elements retarded.

Keywords: Micronutrients, Incubation, Ammonification, Nitrification

Location: Digarkanda, Mymensingh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To study the effects of Fe, Cu, Zn, B, Co and Mo on the available nitrogen in Digarkanda soil under both aerobic and anaerobic conditions.

Methodology:

The soil samples used for this study were collected from Digarkanda where rice plants are currently being grown. The soil samples were stored in polythene bags after being air dried and ground to pass through 20 mesh sieve in Agricultural Chemistry Laboratory, Bangladesh Agricultural University, Mymensingh. The mechanical analysis of the soil samples were performed . The initial soil nutrient status were determined by atomic absorption spectrophotometer (SPUNICUM 90). Micronutrients Fe, Cu and Zn each of 50 ppm and B, Co and Mo each of 20 ppm were mixed well with 10 gm of sieved soil. Micronutrients used were iron as green vitrial, zinc as white vitrial, copper as blue vitrial, boron as sodium tetra borate, cobalt as cobalt oxide and molebdenum as molybdic acid. Analytical grade reagents were used in all cases. These soils were kept in glass tubes of size 4" height and 1" diameter and replicated 5 times. The soils were incubated for periods of 3, 6 and 12 weeks at 30° C and moisture levels 50% (aerobic) and moisture level 133% (anaerobic) were maintained.

Source of Information: Bangladesh J. Agril. Sci. 23(2): 93-96, July, 1996 ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is indicated that ammonification process was depressed up to weeks, except Co after 3 weeks and 8 and Co after 6 weeks. Whilst the nitrification rocess was favoured due to addition of micrountrients in alluvial soils under anaerobic ondition up to 6 weeks. But nitrification was favoured by Fe, Zn and Mo af ter 12 weeksf incubation. The trend on the release of available nitrogen was not similar to aerobic ondition. Compared with the control, NH 4-N formation is abruptly oor aerobically under all incubation periods. It is noteworthy that nitrification process was seriously affected by Fe as supplied in the form of green vitriol after 3 weeks of incubation . The nitrification process in otherwords the release of NOTN was woured by the addition of all micronutrients except Zn after 3 and 12 weeks of1cubation. The significant accumulation of No3-N under anaerobic condition in most of 1e cases except Cu, Zn and Mo after 12 weeks might be due to the action ot special type of heterotrops .From this study, it is almost clear1at the Digarkanda soil might be deficient in certain essential micronutrients. Replenishing such soil with micronutrients would definitely enhance the release of available nitrogen.

Knowledge Management: Journal