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Spikelet Fertility Improvement of Boro Advanced Line (cn6) Through Supplemented Nutrient Management

Amena Sultana
Agronomy Division, Bangladesh Rice Research Institution (BRRI), Gazipur-1701, Bangladesh;

Md. Adil Badshah
Agronomy Division, Bangladesh Rice Research Institution (BRRI), Gazipur-1701, Bangladesh;

Mst. Selima Zahan
Agronomy Division, Bangladesh Rice Research Institution (BRRI), Gazipur-1701, Bangladesh;

Shah Ashadul Islam
Agronomy Division, Bangladesh Rice Research Institution (BRRI), Gazipur-1701, Bangladesh;

Mohammad Issak
Department of Soil Science, Sher-e-Bangle Agricultural University, Dhaka-1207, Bangladesh.

Abstract/ Executive Summary:

The experiment was conducted in the Boro season of 2016-17, at Bangladesh Rice Research Institute (BRRI) farm under the Agro Ecological Zone (AEZ 28) Modhupur Tract. CN6 is a high spikelet bearing early maturing advanced line of rice but low in spikelet fertility. Supplemented nutrient management was examined to increase its spikelet fertility. Five treatments were used in this experiment. The treatments were as follows: T₁ = BRRI recommended fertilizer dose + MgO @ 0.05%, T₂ = BRRI recommended fertilizer dose + 60 g MoP + 60 g elemental S (80% wp) + 20 g ZnSO4, T₃ = BRRI recommended fertilizer dose + Boron @ 5 ppm, T₄ = BRRI recommended fertilizer dose + Copper @ 5 ppm) and T₅ = BRRI recommended fertilizer dose alone. The experiment was conducted in Randomized Complete Block design with three replications. The results revealed that Treatment T₃ (BRRI recommended fertilizer dose + Boron @ 5ppm) produced the more number of grains per panicle with an average of 201 which is 19.9% higher number of grains per panicle over the BRRI recommended fertilization under the treatment of T₅. However, higher grain yield were recorded in treatment T₃ compare to the control treatment T5 (BRRI recommended fertilization). Taken together, our results suggested that BRRI recommended fertilization alone with supplemented nutrient management, especially boron, significantly increased the spikelet fertility of the CN6 advanced line of Boro rice resulting higher yield.

Keywords: Rice, Plant nutrients, Advanced varieties, Spikelet fertility, Grain yield, Yield components

Location: BRRI research farm, Gazipur, Bangladesh

Start Date: 00-00-2016

End Date: 00-00-2017

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To find out appropriate micronutrients that would be effective for increasing spikelete fertility of CN6.

Methodology:

The experiment was carried out in the Boro season of 2016-17, at the BRRI research farm, Gazipur, Bangladesh. The advanced line of Boro rice, CN6, was the test crop under five treatments. The treatments were: T₁ = BRRI recommended fertilizer dose + MgO @ 0.05%), T₂ = BRRI recommended fertilizer dose + 60 g MoP + 60 g elemental S (80% wp) + 20 g ZnSO4, T₃ = BRRI recommended fertilizer dose + Boron @ 5 ppm, T₄ = BRRI recommended fertilizer dose + Copper @ 5 ppm and T₅ = BRRI recommended fertilizer dose alone. BRRI recommended fertilizer doses were used as N-P-K-S-Zn @120-19-60-20-4 kg ha^-1. Urea, TSP, MoP, Gypsum, ZnSO₄.H₂O, CuSO₄, and H₃BO₃ were applied as the sources of N-P-K-S-Zn-Cu-B. Split application of urea was done as 1/3rd at 20 DAT + 1/3rd at 35 DAT + 1/3rd at 56 DAT (before panicle initiation stage) (BRRI, 2015). Full dose of P, K, S and other macronutrient fertilizers were applied at the final land preparation. The experiment was conducted in Randomized Complete Block design with three replications. The soil at the study site was fine silty clay loam type. The location previously had a 3-season rice. The field was cleared and manually ploughed to provide a fine tilth for cultivation. Each plot was demarcated with a 40 cm walk way and a plot size of 3.2 m x 2.2 m. All the micronutrients were foliar sprayed at panicle initiation (PI) stage and grain soft dough stage. Sterility, grains per panicle and 1000-grains per panicle were taken from panicles of ten hills. Heading was considered as 80% of the tillers had more than 50% of the panicle exerted. The crop reused maturity when 90% of the spikelet turned from green to yellowish. At maturity, a 5.0 m2 area was harvested for grain yield. Grain yield and 1000-grains weight was adjusted to 14% moisture content. Weeds were manually controlled (2 times) 20 days after sowing and at maximum tillering stage. And all other agronomic and pest management practices were followed as and when necessary. Temperature data was collected from plant physiology division, BRRI, Gazipur. Statistical analysis was performed using statistic 10.0 software. The least significant difference (LSD) at 5% probability was used to compare means of the treatments. Phonological stages include seedling establishment, maximum tillering, booting, heading, anthesis and maturity was determined. The cumulative growing degree days were calculated by summing the daily mean temperature above base temperature, expressed in degree day. This was determined by using the following formula as per (Nuttonson, 1995). The weather data was collected from the physiology division of BRRI, Gazipur. GDD = {(Tmax + Tmin)/2} - T base. Where, T base = Minimum threshold/base temperature (10°C), T max = Daily maximum temperature (°C), T min = Daily minimum temperature (°C).

Source of Information: Res. Agric. Livest. Fish. Vol. 7, No. 1, April 2020: 17-23. ISSN : P-2409-0603, E-2409-9325

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

On an average 34.67% sterility was observed in CN6. The BRRI recommended fertilizer alone with Boron had positive effects on increasing the spikelet fertility.

Knowledge Management: Journal