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Effect of Natural Inhibitors on Transformation on N-fertilizer in Rice Field

Dr. Nurul Islam
Professor
Dept. of Soil Science, Sher-e-Bangla Agricultural University, Dhaka-1207

Abstract/ Executive Summary:

A field experiment was conducted under the project financed by SAURES at Sher-e-Bangla Agricultural University Farm, Dhaka 1207 during the kharif season of 2008-2009 to study the effect of natural inhibitors on transformation of N-fertilizer in rice field. The experimental soil was clay loam in texture having pH of 6.3. The treatments used were 3 levels of each of urea fertilizers (N) viz. F₁= low (80 kg N/ha), F₂ = medium (100 kg N ha-1), F₃= high (120 N kg ha^-1) and 5 types of inhibitors viz. I0 – no inhibitor, I1 = neem oil, I2 = neem cake, I3 = tar, I4 = DCD (chemical inhibitor) in 15 treatment combinations with 3 replications. The results demonstrated that use of neem oil along with fertilizer increased grain yield. The maximum significant grain yield was obtained with the treatment combination, (medium N + neem oil). The use of neem oil and neem cake with medium doses of fertilizer increased fertilizer use efficiency.

Keywords: Natural inhibitors, Transformation, N-fertilizer, Rice field

Location: Sher-e-Bangla Agricultural University Farm, SAU, Dhaka

Start Date: 00-00-2008

End Date: 00-00-2009

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To know the effect of inhibitors on the transformation on N in rice field

2. To find out the suitable inhibitor for N-fertilizer in rice field

3. To reduce the losses on N and proper utilization of N in rice field.

Methodology:

A field experiment was conducted under the project financed by SAURES at Sher-e-Bangla Agricultural University Farm, Dhaka 1207 during the kharif season of 2008-2009 to study the effect of natural inhibitors on transformation of N-fertilizer in rice field. The experimental soil was clay loam in texture having pH of 6.3. Treatment combinations: T₁ = low N (urea) + no inhibitor T₂= low N (urea) + neem oil T₃= low N (urea) + neem dust T₄ = low N (urea) + tar T₅ = low N (urea) + chemical inhibitor T₆ = medium N (urea) + no inhibitor T₇ = medium N (urea) + neem oil T₈ = medium N (urea) + neem dust T₉= medium N (urea) + tar T₁₀ = medium N (urea) + Chemical inhibitor T₁₁ = high N (urea) + no inhibitor T₁₂ = high N (urea) + neem oil T₁₃ = high N (urea) + neem dust T₁₄ = high N (urea) + Chemical inhibitor.

Source of Information: Final Report of Sher-e-Bangla Agricultural University Research System (SAURES) funded Project.

Article Link (Online Journal):

Funding Source:

1.	Budget: 88000/-

Total Budget (Tk.) : 88000/-

Achievement/Findings:

The results demonstrated that use of neem oil along with fertilizer increased grain yield. The maximum significant grain yield was obtained with the treatment combination, (medium N + neem oil). The use of neem oil and neem cake with medium doses of fertilizer increased fertilizer use efficiency. It was also observed that significant amount of available nitrogen (NH₄+ + NO₃ -) was found during cropping season due to combined application of neem product and fertilizer. Observation revealed that the amount of NO₃_- -N was higher than that of NH₄+ -N in all the sampling stages although the expectation was reverse i e. more amount of NH₄+ -N than that or NO₃_-- N. Possible reason may be the lack of proper maintenance of anaerobic condition during soil sampling.

Knowledge Management: Report/Proceedings