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Effect of Azolla-urea Application on Yield and Nps Uptake by BRRI Dhan29 in Boro Season

Rehana Banu
Department of Agricultural Education, Ranigonj Ehia Hossain High School and College, Dinajpur, Bangladesh.

MH. Mian
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh.

M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh.

M.A. Hasan
Department of Crop Botany, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh.

Abstract/ Executive Summary:

A field experiment was carried out at the Bangladesh Agricultural University Farm, Mymensingh, Bangladesh during Boro season of 2000 to evaluate the comparative effect between one or two layers of incorporated AzoIla biomass from 0.2 and 0.1 kg m^-2 inoculum with 50 kg N ha^-1 as urea and the recommended dose ofN (100 kg ha^-1) on the yield and NPS uptake of BRRI Dhan 29. All the treatments were tried in two different plant spacings Le., S₁: 25-25x15 cm and S₂: 35-15x15 cm. The highest grain yield of 4.43 t ha^-1 produced by two incorporations of Azolla @ 0.2 kg m^-2 inoculum with 50 kg N ha^-1 as urea, which differed significantly from 4.06 t ha^-1 yield produced by 100 kg N ha^-1 as urea (the recommended dose). But the yield of 3.88 t ha^-1 produced by twice incorporation of Azolla @ 0.1 kg m^-2 inoculum with 50 kg N ha^-1 as urea and the yield from one incorporation of Azolla @ 0.1 and 0.2 kg m^-2 inoculum plus 50 kg N ha^-1 as urea (3.65 and 3.91 t ha^-1, respectively) did not differ statistically with that of 1 00 kg N ha^-1 as urea. The lowest grain yield of 2.26 t ha^-1 was recorded from the control. The nitrogen, phosphorus and sulfur (NPS) uptake in grain and straw increased significantly by about 40-84,45.3-109 and 41-87%, respectively, due to incorporation of Azolla over control. The difference between two plant spacings was not significant. Interaction effect between plant spacing and Azalla-urea treatments also did not exhibit any significant variation.

Keywords: Azolla, NPS uptake, Yield of rice

Location: Bangladesh Agricultural University farm, Mymensingh

Start Date: 00-00-2000

End Date: 00-00-2000

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the effect of incorporated Azolla biomass along with urea on the yield of BRRI Dhan 29 and to asses N, P and S uptake by the rice plant.

Methodology:

The experiment was conducted in the Non-calcareous Dark Grey Flood plain soil (Sonatola Series) of the Bangladesh Agricultural University farm, Mymensingh in Bora season of 2000 in a field with characteristics indicated. There were altogether six treatments: To No Azolla, no N, T₁ Twice incorporation of AzoIla @ 0.1 kg m^-2 inoculum (28 and 45 DAT) with N₅₀ (15 and 60 DAT), T₂ Twice incorporation of Azolla @ 0.2kg m^-2 inoculum (28 and 45 DAT) with N₅₀ (15 and 60 DAT), T₃ Once incorporation of Azolla @ 0.1kg m^-2 inoculum (45 DAT) with N₅₀(15 and 60 DAT), T₄ Once incorporation of Azolla @ 0.1kg m^-2 inoculum (45 DAT) with N_5o(l5 and 60 DAT), T₅ Recommended dose of urea (100 kg N ha^-1 as urea applied at 15,45 and 60 DAT)

The above treatments were tried in two plant spacing: 25- 25xl5 cm (S₁) and 35-15x15 cm (S₂). In case of treatment T₁ and T₂Azolla was inoculated at 3 DAT (days after transplanting) and the layer formed was incorporated at 28 DAT. The second inoculation was done at 29 DAT and layer formed was incorporated at 45 DAT. In treatment T₃ and T₄ Azolla was first inoculated at 3 DAT and incorporated the layer formed at 45 DAT. Recommended dose of P was applied as basal in case of T_oand T₅ but in case of other treatments half of the P as basal and the rest half of P was used in 4 equal splits within 40 DAT for the better growth of Azolla. All treatments also received the recommended dose of K, S and Zn.

The experiment was laid out in a split- plot design having three replications. Plant spacing was assigned to the main plot and Azolla-urea treatments to the sub plot. 50 days old seedlings were transplanted in the experimental plots. Azolla mass was maintained and multiplied in the nursery for use in the experimental plots. Necessary irrigation was done to maintain desired water layer during the growth of Azolla. Insecticide was applied to prevent the Azolla from insect attack. After harvesting the whole plot, the grain and straw yield were separated by hand threshing. From each plot 100 g grain and 100 g straw were taken for oven drying. Grain and straw were analyzed for total N, available P and available S content following some standard methods. The data were analyzed statistically following ANOVA and the means differences were adjusted using DMRT.

Source of Information: Pakistan Journal of Biological Sciences 6 (11): 968-971, 2003 (ISSN 1028-8880)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall results indicated that the application of Azolla increased grain and straw yield of rice. NPS uptake by rice plant was also increased by Azolla application. The treatment T₂ i.e. twice incorporation of Azolla from 0.2 kg m^-2 inoculum along with 50 kg N ha^-1 as urea was superior to all other treatments in increasing yield of rice and NPS uptake by rice plant.

Knowledge Management: Journal