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

Combined Use of Azolla and Urea as Nitrogen Sources for Cultivation of BRRI Dhan 30 in Aman Season

Md. Matiur Rahman
MS Student
Session: 1991-92, Semester: July-December 2011, Dept. of Soil Science, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

A field experiment was carried out with BRRI dhan30 during the aman seaon (August to December) of 2000 at Bangladesh Agricultural University Farm, Mymensingh to compare the effect of incorporated Azolla biomass produced simultaneously with rice plus 30, 40, 50, 60 and 70% N as urea with recommended dose of N on the yield of and NPS uptake by BRRI dhan 30. One layer of Azolla grown from 0.2 kg m^-2 inoculum simultaneously with BRRl dhan 30 produced 1 3.5 -16.0 t ha^-1 biomass containing 29.0 -34.88 kg N ha^-1. The highest grain yield of 4.92 t ha^-1 with the highest total (grain +straw) uptake of 107.1 kg ha^-1, 21.31 kg ha^-1, and 10.2 kg S ha^-1 were recorded due to incorporation of 16.0 t ha^-1, 1 Azolla biomass (grown from 0.2 kg m^-2 inoculum) plus application of 58 kg ha^-1 in three splits at 15, 30 and 45 DAT compared to 4.80 t ha^-1 grain yield containing 102.04 kg N ha^-1, 19.88 kg ha^-1, and 7.05 kg S ha^-1, (grain +straw) respectively, obtained due to the application of 126 kg N ha^-1 as urea. There was no significant difference between these two treatments. Thus, the rate of 0.2 kg ha^-1, Azolla inoculum to produce Azolla biomass simultaneously with BRRI dhan30 for incorporation a N sources plus application of 70% of recommended dose of N ha^-1 as urea appeared to he a good practice in reducing the use of costly urea by about 40%.

Keywords: Azollz, BRRI dhan30, Urea.

Location: Bangladesh Agricultural University Farm, Mymensingh

Start Date: 00-00-2000

End Date: 00-00-2000

Program Area: Crop-Soil-Water Management

Commodity: Bio fertilizer, Rice

Objectives:

(a) To assess whether Azolla can be grown together with BRRI dhan 30 in aman season to obtain a good amount of biomass as a nitrogen source.

(b) To study the effect of incorporated Azolla biomass along with urea on BRRldhan 30.

(c) To compare the performance of Azolla plus 30%, 40%, 50%, 60% and 70% of recommended dose of urea-N with that of using 100% of recommended dose of urea-N.

Methodology:

A field experiment was conducted at Bangladesh Agricultural University, Mymensingh during the aman season (August to December) of 2000 to study the combined use of Azolla and urea as nitrogen sources for cultivation of BRRidhan 30. Azolla pinnata, a native species, was collected from a low land (ditch) of the adjacent village Fakira Kanda of Mymensingb. The collected samples were then multiplied in the field nursery plots of the Department of Soil Science for using in the experiment. Triple super phosphate (TSP) at the rate of I 0 kg ha^-1 was applied at 10 days intervals for better growth of Azolla, in the nursery. A modem rice variety BRRIdhan 30 was used as the test crop. There were twelve treatments in this experiment including control. The treatments were as follows: To : Control (no urea, no Azolla), T₁: 300/o N as urea + Azolla, T₂:400/o N as urea + Azolla, T₃: 500/o N as urea + Azolla, T₄: 600/o N as urea + Azolla, T₅: 70% N as urea + Azolla, T₆: 30% N as urea, T₇: 40% N as urea, T₈: 500/o N as urea, T₉: 600/o N as urea, T₁₀: 700/o N as urea, and T₁₁: I 000% N as urea, i.e., recommended dose 83 kg N ha^-1 In case of treatments T₁, T₂, T₃, T₄ and T₅ the inoculation of Azolla was done at 9 DAT and the incorporation of the formed layers was done at 24 DAT. The dose inoculated Azolla was 0.2 kg m^-2 for all five treatments (T₁, T₂, T₃, T₄ and T₅). The recommended dose of urea was applied in T₁₁ treatment at 15, 30 and 45 DAT in three equal splits and 30%. 40%, 50%, 60% and 70% of recommended does were applied in treatments T₁, T₂, T₃, T₄ and T₅ with Azolla and T₆, T₇, T₈, T₉ T₁₀ and T₁₁ without Azolla. respectively a 15, 30 and 45 days after transplanting (DAT) in three equal splits. The experiment was laid out in a Randomized Block Design having three replications.

Source of Information: MS Thesis, July-December 2001, Dept. of Soil Science, Bangladesh Agricultural University, Mymensingh.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The field experimenter was conducted at Bangladesh Agricultural University farm. Mymensingh in aman season of 2000 (i) to asses whether Azolla can he grown together with BRRIdhan 30 in aman season to obtain a good amount of biomass as nitrogen sources. (ii) to study the effcct of incorporated Azolla biomass along with urea on BRRl dhan 30 (iii) to compare the performance of Azolla plu 30, 40, 50, 60 and 70% of urea N with that of using 100% of recommended does of urea-N. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Each block was divided into twelve unit plots . The unit plot size was 4m X 2.5m. The total number of unit plot was 36. The treatments were randomly distributed in each block. There were following testaments: T₀: Control (no urea, no Azolla), T₁: 30% N as urea + Azolla, T₂: 40% N as urea + Azolla, T₃: 50% N as urea + Azolla, T₄: 60% N as urea + Azolla, T₅: 70% N as urea +Azolla, T₆: 30% N as urea. T₇: 40% N as urea, T₈: 50% as urea, T₉: 60% N as urea, T₁₀: 70% N as urea, T₁₁: 100% N as urea, i.e. recommended dose 83 kg N as urea ha^-1. Here the rate of Azolla inoculum was 0.2 kg m^-2 grown within 9 -30 DAT and urea was applied into three equal splits (at 15, 30 and 45 DAT) in all treatments. The experimental field was prepared by ploughing and cross ploughing by power tiller and country plough. All kinds of weeds were removed from the field and the land was leveled by laddering. The full recommended dose of P @ 21 kg P ha^-1 as triple superphosphate. potassium @ 35 kg K ha^-1 as muriate of potash, sulphur @ 11kg S ha^-1 as gypsum and Zinc @ 9 kg Z ha^-1 as zinc oxide were applied a basal dose to all experimental plots during final land preparation. 26 day-old seedlings of BRRIdhan 30 were transplanted on 10 August, 2000@2 -3 seedlings hill^-1 Azolla inocula were applied at 9 DAT. Necessary irrigation was done as and when necessary to maintain about 6 cm of water level for the growth of Azolla. The crop was harvested at maturity on 4 December, 2000. The results of the experiments are summarized: The application of 0.2 kg m^-2 Azolla inoculum produced 13.5 t ha^-1 biomass containing 29.0 -34.88 kg N ha^-1 in 21 days(within 9 -30 DAT). The grain yield was the highest (4.92 t ha^-1) due to the treatment T₅ i.e. Azolla biomass plu 70% N ha^-1 as urea which was not significantly different from that of T₄ (4.7 l ha^-1) and T₁₁ (4.80 t ha^-1 The lowest grain yield of 2.25 t ha^-1 was produced in the control. Straw yield showed almost a similar trend. The highest amount of N uptake (grain+straw) for the treatment T₅ i.e.Azolla biomas plu 70° ha^-1statically identical to T₄ (56.23 kg ha^-1) and 1 (55.66 kg N ha^-1) and differed significantly from that of other treatments. Total P and uptake (grain+ straw) b) BRRI dhan 30 were influenced by addition of Azolla biomass and urea. All treatments recorded significantly uptake of P over the control. The S uptake in grain and straw also increased significantly . The overall results indicated that Azolla could be grown simultaneously with BRRI dhan30 for incorporation as biofertilizer to reduce the use of urea which could lessen the cost of production.

Knowledge Management: Journal, Thesis