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Response of Potassium Nitrate on Yield and Yield Contributing Characters of Boro Rice Cv. BRRI Dhan28

Mahmudul Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202.

Md. Babul Akter
Bangladesh Institute of Nuclear Agriculture (BINA), Sub-station, Rahmatpur, Barishal-8211.

Md. Masudul Karim
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh-2202.

Fahmina Yasmine
Plant Breeding Division, Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh-2202.

Ahmed Khairul Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202.

Abstract/ Executive Summary:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, to explore the growth and yield performance of boro rice cv. BRRI dhan28 is influenced by foliar spray of potassium nitrate (KNO₃) at four rice growth stages. The experiment consisted of four doses of KNO₃ viz. 0 (Control), 0.25, 0.50, and 1.00 kg ha⁻¹ and applied at four growth stages of rice development viz. at panicle initiation, at ear emergence, at anthesis period, and at the dough stage. This experiment was carried out in Randomized Complete Block Design (RCBD) with three replications with 10 m² (4.0 m × 2.5 m) unit plot size and spacing between blocks and unit plots was 1 m and 0.5 m, respectively. Results revealed that foliar application of potassium nitrate at four growth stages significantly affected yield and yield contributing characters of BRRI dhan28. But most of the yield contributing characters did not differ significantly due to the interaction between potassium nitrate and stage of foliar spray. However, the foliar application of KNO₃ @ 0.25 kg ha⁻¹ showed the highest yield production (5.86 kg ha⁻¹) while the lowest yield (4.85 kg ha⁻¹) was found in control. Furthermore, better yield performances were recorded when the KNO₃ was applied at the panicle initiation stage rather than the other four growth stages. The total number of tillers, 1000–grain weight, and grain yield, was higher with foliar spraying of a 0.25 kg ha⁻¹ KNO₃ at the panicle initiation stage. From this experiment, it may be concluded that foliar application of KNO₃ affected the yield performances of BRRI dhan28, and 0.25 kg ha⁻¹ KNO₃ produced the highest grain yield when applied at the panicle initiation stage of boro rice.

Keywords: Rice, potassium nitrate, foliar application, yield and BRRI dhan28

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Boro rice

Objectives:

To investigate the effect of foliar application of potassium nitrate on boro rice's growth and yield performance at different growth stages of BRRI dhan28.

Methodology:

The experimental land was opened on 14 January 2018 with a tractor and subsequently ploughed twice with country plough followed by laddering. The land was silty loam in texture with a soil pH value of 6.5, low in organic matter content, and its general fertility level. Soil's physical and chemical properties were tested in the Agri-Humboldt Soil Testing Lab, Department of Soil Science, Bangladesh Agricultural University, Mymensingh. The experimental area was located under the sub-tropical climate specialized by moderately high temperature and heavy rainfall during the Kharif season (April–September) and low rainfall with moderately low temperature during Rabi season (October– March). Seeds of BRRI dhan28 were used as the planting material of the experiment. The seeds were soaked into water buckets for 24 hours and then taken out of the water and packed in the gunny bags for sprouting. The seeds sprouted after 72 hours of steeping. Seedbed was prepared by puddling the soil. Sprouted seeds were sown and after sowing the seeds, proper care was taken for ensuring the normal growth and development of the seedling in the seedbed. Seedbeds were made ready for uprooting the seedling by application of water on the previous day. The uprooted seedlings were carried directly to the experimental plots for transplanting on the same day. Thirty-five-day old seedlings were transplanted in the experimental plots. Single healthy seedling hill⁻¹ was transplanted in lines 25 cm apart with 15 cm spacing between the hills. Seedlings in some hills died off, and those were replaced by gap-filling after 1 week of transplanting with the seedling from the same source. During the whole period of rice growth and rice development, hand weeding was done three times to control the weeds. The first wedding was done at 15 DAT followed by the first top dressing of urea. The second and third weeding was done at 35 DAT and 55 DAT followed by the second and third top dressing of urea. Irrigation was applied to the plots from deep tube-well and the same water level was maintained in each plot during the growing period or rice. At the time of irrigation, sufficient care was taken to avoid irrigation water flow from one plot to another. Excess water of the channel was later drained out. The experiment consisted of two sets of treatments. The first set comprised four doses of potassium nitrate and the second set consisted of four stages of foliar spray. The treatments were; Factor A: 4 Doses of potassium nitrate (kg ha^–1), e.g. C₁=0 (Control) C₂=0.25, C₃=0.50 and C₄=1.00 and Factor B: 4 stages of foliar spray e.g. S₁ = at panicle initiation, S₂ = at ear emergence, S₃ = at anthesis period and S₄ = at dough stage. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Treatment combinations were assigned at random to a block. The total numbers of unit plots were 48 and each plot size was 4.0 m × 2.5 m. The distance maintained between the main plot and replications were 0.75 m and 1.0 m, respectively. The fertilizers were measured and applied separately in the unit plots. The fertilizers TSP, Gypsum, Zinc Sulphate and Boron were applied in the experimental plots at the rates of 90, 60, 20, 5 and 5 kg ha⁻¹, respectively. During final land preparation, the land was fertilized with a full dose of triple superphosphate (TSP), Gypsum and Zinc Sulphate fertilizers were applied according to the treatments. The fertilizers were incorporated into the soil by ploughing. Potassium nitrate was applied as a foliar spray in four different growth stages at the rate of 0 kg ha⁻¹, 0.25 kg ha⁻¹, 0.5 kg ha⁻¹ and 1.0 kg ha⁻¹, respectively. Data on yield and yield contributing characters were compiled, tabulated and used for statistical analysis. The collected data were analyzed statistically following two factor experimental design of RCRD by programming R software version r3.4.2. The main differences among the treatments were calculated with Duncan’s Multiple Range Test and f-test.

Source of Information: Intl. J. Multidiscip. Pers. 01(01): 05-13, 2020

Article Link (Online Journal): https://doi.org/10.18801/ijmp.010120.02

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Yield and yield contributing characters of BRRI dhan28 were significantly affected by the foliar application of KNO₃ at different growth stages of rice. Foliar application of 0.25 kg ha⁻¹ KNO₃ showed the best performances among the four doses of KNO₃, while this foliar spray at the panicle initiation stage performed better than the application at other growth stages. Based on the results of this experiment, it can be concluded that the application of KNO₃ @ 0.25 kg ha⁻¹ at the panicle initiation stage was found best in the boro season in Bangladesh to produce a higher yield.

Knowledge Management: Journal