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Response of Br11 Rice to 15n- Labelled Azolla and Urea Incorporated in Boro Season

M. H. MIAN
Department of Soil Science, BAU, Mymensingh

Abstract/ Executive Summary:

The grain yield of BR11 rice was increased by 31.27 and 32% over the control due to incorporation of 64-65,60 and 60 kg N ha-1 as Azolla (2 splits-O and 60 DT), urea (similar 2 splits) 'and urea (3 best splits); respectively. in Boro season of 1989. The corresponding increases in N uptake in grains were 51-53, 49-52 and 55%, respectively, over the control. Straw showed a similar yield and N uptake pattern. Both yield and N uptake were higher due to Azolla incorporation compared to urea incorporation. The 15_N tracer showed an uptake of 40-48, 41-46 and 50% of 15_N incorporated as Azolla (2 splits), urea (2 splits) and urea (3 best splits), respectively. Overall, the response of BR11 rice to Azolla, and urea application at an equal N-rate was comparable. Azolla being rather better.

Keywords: Azolla, 15N tracer, N availability, Urea, BR11 rice

Location: Bangladesh Agricultural University Farm, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Bio fertilizer

Objectives:

To observe the effects of Azolla and urea on the yield of BR11 rice in Boro season, and the transfer of nitrogen from Azolla and urea to the rice plants

Methodology:

This experiment was carried out in a silty loam soil (Sonatola series) of Bangladesh Agricultural University Farm, Mymensingh (Noncalcareous dark grey floodplain type). The soil had a pH 6.8, organic carbon 0.91%, available P 11.0 ppm, available K 0.14 meq 1009-1 and 0.09% total N, The experiment was laid out in a randomized block design with four replications. Thirty-day-old seedlings of BR11 rice were transplanted at 2-seedlings per hill in a square (20cm x 20cm) spacing. Each plot size was 1 m x 1 m, There were the following treatments: 1. 30 kg N ha-1 15_N-1 labelled Azolla incorporated at transplanting and 30 kg N ha-1 unlabelled Azolla incorporated at 60 DT;. 2. 30 kg N ha-1 unlabelled Azolla incorporated at transplanting and 30 kg N ha-1 15_N_ labelled Azolla incorporated at 60 DT : 3. Same as in No, 1 but using urea; 4. Same as in No.2 but using urea; 5. 60 kg N ha-1 15_N labelled urea in 3 best splits i, e, 30 kg at transplanting,15 kg at 30 DT and 15 kg at 60 DT. P and K were applied as basal at the- rate of 60 add 40kg ha-1, respectively.

Source of Information: Proc. BAU Res. Prog. 5: 240-245, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Both yield and N uptake were higher due to Azolla incorporation compared to only urea incorporation.

Knowledge Management: Report/Proceedings