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Effects of Reduced Rates of N, P, K, S and Zn on the Growth and Yield of BRRI Dhan29

Md. Zakaria Ibne Baki
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Abul Hashem
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Rafiqul Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during Boro season of 2014 to study the effects of reduced rates of N, P, K, S and Zn on the growth and yield of BRRI dhan29 rice. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. There were seven treatments such as T₁: control; T₂: Recommended Fertilizer Dose (RFD); T₃: 60% of RFD; T₄: 70% of RFD; T₅: 80% of RFD; T₆: 90% of RFD and T₇: 110% of RFD. The recommended fertilizer doses applied for the experiment were 100 kg N ha^-1, 15 kg P ha^-1, 50 kg K ha^-1, 15 kg S ha^-1 and 1.5 kg Zn ha^-1. Nitrogen, phosphorus, potassium, sulphur and zinc were supplied from urea, TSP, MoP, gypsum and zinc sulphate, respectively. The full doses of TSP, MoP, gypsum and zinc sulphate were applied as basal dose during final land preparation while urea was applied in three equal splits. The grain and straw yields as well as biological yield of BRRI dhan29 were significantly affected due to different treatments. The highest grain yield of 5.12 t ha^-1 was observed in the plot where treatment T₅ were applied which containing 80% of RFD which was statistically identical to those recorded in the treatments T₂ (Recommended fertilizer dose), T₆(90% of RFD) and T₇ (110% of RFD). Effective tillers hill , filled grains panicle , unfilled 11 grains panicle 1 and 1000-grains weight were also higher where treatment T was applied. However, plant height 5 and panicle length were higher where treatment T₅ (80% of RFD) was applied. Therefore, the treatment having 80% of RFD fertilizer performed better than RFD and other treatments. The results obtained clearly indicated that to increase the crop yield 80% of RFD may be practiced instead of RFD for higher grain yield as they were statistically similar.

Keywords: BRRI dhan29, Growth, Recommended fertilizer doses and Yield

Location: Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-2014

End Date: 00-00-2014

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the effects of reduced rates of N, P, K, S and Zn on the yield and yield contributing characters of BRRI dhan 29.

Methodology:

The experiment was set up at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during Boro season of 2014. The farm is situated at the latitude of 24.75 N and longitude of 90.5^oE. Bangladesh Agricultural University, Mymensingh falls under the AEZ of Old Brahmaputra Floodplain (AEZ 9). The experimental area belongs to sub-tropical climate and is characterized by high temperature and moderately high rainfall during kharif season (April to September) and low temperature in rabi season. This experiment consists of seven treatments such as T₁: control; T₂: Recommended Fertilizer Dose; T₃: 60% of RFD; T₄: 70% of RFD; T₅: 80% of RFD; T₆: 90% of RFD and T₇: 110% of RFD. Recommended Fertilizer Dose (RFD) = 100 kg N ha^-1, 15 kg P ha^-1, 50 kg K ha^-1, 15 kg S ha^-1 and 1.5 kg Zn ha^-1 were applied. The experiment was laid out in a randomized complete block design (RCBD) with three replications of each treatment. Each replication is represented by a block. Each block was divided into seven unit plots for the selected treatment. There were 21 (7 x 3) unit plots. The unit plot size was 2.5 m x 4 m. The spacing between blocks was 1m and between plots was 0.5 m. The treatments were randomly distributed to unit plots in each block. The recommended high yielding variety BRRI dhan29 was used as a test crop. Forty day old seedlings were transplanted in the experimental plots on 23 January 2014. A distance of 20 cm from row to row and 20 cm from plant to plant was maintained. Three seedlings were used in each hill. The full dose of triple super phosphate (TSP), murite of potash (MoP), gypsum and zinc sulphate were applied at the time of final land preparation. The first split of urea was applied after 20 days of transplanting and second split of urea was applied after 40 days of transplanting at maximum tillering stage and third installment after 60 days of transplanting i.e. at panicle initiation stage. Intercultural operations were done for ensuring and maintaining the normal growth of the crop like Irrigation, weeding, insect and pest controls. The crop was harvested at maturity on 03 May, 2014. After harvest, rice plants of three replicated treatments were bundled separately and carried to the laboratory and separated the grains from panicles. The separated grains and straw were dried in the sun for 4 days. The sun dried weight of grain and straw plot were taken (moisture up to 14%) and kept in brown paper bags for analysis of each treatment.

The crop was harvested at maturity on 03 May, 2014. After harvest, rice plants of three replicated treatments were bundled separately and carried to the laboratory and separated the grains from panicles. The separated grains and straw were dried in the sun for 4 days. The sun dried weight of grain and straw plot were taken (moisture up to 14%) and kept in brown paper bags for analysis of each treatment. From the 10 randomly selected hills the following observations were recorded. Plant height, number of tillers hill^-1, panicle length, filled and unfilled grains panicle^-1, 1000-grain weight, grain and straw yields. The analysis of variance for crop parameters and also for nutrient contents and nutrient uptake by grain and straw were done following the principles of F statistics. The mean results in case of significant F-value were compared by the Duncan's Multiple Range Test (DMRT).

Source of Information: American-Eurasian J. Agric. & Environ. Sci., 15 (4): 518-522, 2015; ISSN 1818-6769

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the entire observation, it is distinct that the yield obtained from treatment T₂ (Recommended Fertilizer Dose), T₅ (80% of RFD) and T₆ (90% of RFD) is statistically similar. The treatment T₂ is recommended dose for the cultivation of BRRI dhan29 which provide the higher yield. But statistically there is no significant yield difference among T₂, T₅ and T₆ . But in comparison among the treatments, T treatment is comprised of 100% of RFD whereas, the treatment T₅ and T₆ are comprised of 80% and 90% of RFD respectively. So it is worth using 10% and 20% excess fertilizer which ultimately increases the cost of production. The present situation suggest that the treatment comprised of 80% of Recommended Fertilizer Dose will be beneficial for cultivation of BRRI dhan29 and consequently reduced the rate of Nitrogen, Phosphorous, Potassium and Sulphur by keeping the yield at desired level.

Knowledge Management: Journal