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Site Specific Nutrient Management in Ganges Tidal Floodplain Soil of BARIsal for Rice (oryza Sativa)

M F Amin
CSISA Project, IRRI, Barisal 8200

D Nath
CSISA Project, IRRI, Barisal 8200

M Sh Islam
CSISA Project, IRRI, Barisal 8200

M A Saleque
CSISA Project, IRRI Dhaka-1213, Bangladesh

Abstract/ Executive Summary:

Farmer’s Participatory Site Specific Nutrient Management (SSNM) trials were conducted for irrigated, transplanted high yielding rice (Oryza sativa L.) at Barisal district of Bangladesh during Boro season 2012. Four treatments (NPK, PK, NK, and NP) were imposed to observe the response of indigenous nutrient elements on rice yield attributes in order to develop a site specific nutrient management approach for the farmers of Ganges Tidal Floodplain ecosystem to increase their fertilizer use efficiency. The highest grain yield (5.67t ha^-1) was observed in NPK treatment plot which gave 50.97%, 61.20% and11.11% higher yield than PK, NK and NP treatment plots, respectively. The response of indigenous P was very poor and the lowest grain yield (2.20 t ha-1) was found in P omission plot. The response of indigenous N was also poor (2.78 t ha-1) but the response of indigenous K was remarkable and it gave second highest grain yield (5.04 t ha^-1). This result shows that N and P are the most vibrant factors to increase yield and they have significant impact on yield. To produce high yielding rice in Boro season, farmers of that area can be recommended for using N, P and K as 130, 14.46 and 15.62 kg ha-1, respectively. It can save 5.80% N, 19.67% P and 70.53% K in compare with that of applied doses.

Keywords: Grain yield, Rice, Nutrient omission, Site Specific Nutrient Management

Location: Six farmers of South Pangsha village of Madhabpasha union in Babugonj Upazila of Barisal district

Start Date: 00-00-2012

End Date: 00-00-2012

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To recognize spatial variability in soil fertility in rice fields and develop a site-specific nutrient management package for rice in a village of tidal ecosystems.

Methodology:

The participatory Site Specific Nutrient Management (SSNM) experiment involved six farmers of South Pangsha village of Madhabpasha union in Babugonj Upazila of Barisal district during the Boro season, 2012. Farmers of similar socio-economic conditions were selected through consulting with farmers and local elites using PRA tools (Focus group discussion and in-depth interview).The site belongs to the Ganges Tidal Floodplain soil of Agro-ecological Zone (AEZ) 13. The most common cropping system in that area is rice-fallow-fallow due to submergence of heavy rainfall and tidal water during Aman season. High yielding Boro rice variety BRRI dhan29 was selected with farmers’ concern and used in all six farmer’s plots. Truthfully-labeled seeds (TLS) of BRRI dhan29 were collected from BRRI Regional Station, Barisal. Before setting the trials, soil samples (0-15 cm depth) were collected from each farmer’s field and analyzed in Soil Research and Development Institute lab accordingly. Four fertilizer treatments i.e. balance fertilizer (NPK), nitrogen omission (PK), phosphorus omission (NK), and potassium omission (NP) were used in the trial plots. Blanket doses of Zinc (Zn) and sulfur (S) were applied in all treatment plots. The rate of N, P, K, S and Zn were137.97, 17.96, 52.39, 13.46 and 2.69 kg ha^-1in the form of Urea, TSP, MOP, Gypsum and Zinc Sulfate, respectivel. Urea was applied in three installments (at 15 days after transplanting, 30 days after transplanting and 40-45 days after transplanting) and full doses of other fertilizers were applied during final land preparation. Trial farmers raised quality seedlings in wet bed and 45-50 day-old seedlings were transplanted in main fields. The experimental design was Randomized Complete Block Design (RCBD) with disperse replication in six farmers’ field under irrigated condition. Layout was done carefully maintaining 50m2 unit plot size for each treatment. Ridges (bunds) were given to avoid contamination of irrigation water from one plot to another plot. During transplanting farmers followed spacing of 20 cm×20 cm with 2/3 seedlings per hill accordingly. Weeds were managed manually twice at 20-25 days after transplanting and 35-40 days after transplanting. Pest was controlled by Integrated Pest Management (IPM). All crop management practices (seedbed preparation, seedling raising, land preparation, crop establishment, irrigation, weed control, insect and disease control) were done by the farmers. To keep all management practices same in all treatments of all farmers’ plots trainings were provided to the farmers from CSISA project of International Rice Research Institute. Monitoring was done through frequent field visits and keeping close contact with respective farmers during the crop growing period. Data of yield attributes (grain yield of 5m² area, straw yield of 5m² area, moisture content, plant height, number of tillers hill^-1 and number of panicles hill^-1) were collected from each treatment of 6 trials. Grain yield of each sample were adjusted to 14% moisture content. Collected data were analyzed using the CropStat7.2 software. Grain yield was calculated at 14% moisture content. Economic calculations were made using U.S. dollars as standard currency. For the comparison between estimated SSNM dose and farmers practice, yield data as well as amount of fertilizers used by the farmers were collected from six farmers of the same area.

Source of Information: Eco-friendly Agril. J. 6(02): 21-24, 2013 (February); ISSN 1999-7957

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Nitrogen and Phosphorous are the most limiting factors to increase yield in South Pangsha of Babuganj while K omission plot had no significant impact. Thus to increase rice yield significantly farmers could be emphasized on the use of nitrogen and phosphate fertilizers as well as would be advised to be cautious in the excessive use of Nitrogen fertilizer. To produce BRRI dhan29 in Boro season farmers of that area could be recommended for using N, P and K as 130, 14.46 and 15.62 kg ha^-1, respectively. It can save 5.40% N, 19.67% P and 70.53% K in comparison with that of applied recommended doses. As Potassium remain enough in their field, so, from now, they could use lower amount of MOP fertilizer in their field from the previous years application.

Knowledge Management: Journal