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Farmer's Participatory Site Specific Nutrient Management in Tidal Flooded Soil for High Yielding Aus Rice

M Sh Islam
PSO
Bangladesh Rice Research Institute Regional Station, Rangpur.

M N H Mahmud
Senior Scientific Officer
Irrigation and Water Management Division, Bangladesh Rice Research Institute, Gazipur 1701.

F Rahman
Soil Science Division, Bangladesh Rice Research Institute, Gazipur 1701.

M. A. Saleque
Coordinator for Advanced Studies and Research, Bangladesh RiceResearch Institute, Gazipur 1701.

Abstract/ Executive Summary:

Experiments were conducted in farmers' fields at Bakerganj, Barisal and Kathaltoli, Potuakhali districts to develop site-specific nutrient management package for high yielding Aus rice. The participatory farmers delineated soil fertility as the most fertile (grade I), medium fertile (grade II) and the least fertile (grade III) soil. Omissions of N, P, and K were compared with added NPK fertilizers in different fertility grades. At Bakerganj, the grain yield (3.79 t ha^-1) in grade I was slightly higher than the other grades. The omission of N, P and K reduced grain yield by 0.76, 0.95 and 0.29 t ha^-1 in grade I, 1.53,0.87 and 1.25 t ha^-1 in grade II and 0.64,0 and 0.28 t ha^-1 in grade III respectively. At Kathaltoli, the grain yield (6.21 t ha^-1) in grade I was higher than grade II (5.58 t ha^-1) and grade III (5.11 t ba^-1). The Omission of N, P and K reduced grain yield by 0.93, 0.18 and 0.09 t ha^-1 in grade I, 1.30,0.37 and 0.93 t ha^-1 in grade II and 1.86, 1.30 and 1.30 t ha^-1 in grade III respectively. For Bakerganj, the calculated optimum doses of N were 34, 69 and 29 kg ha^-1, P were 4.0, 4.0 and 0.0 kg ha and K were 7.0, 31.0 and 7.0 kg ha^-1 for fertility grade I, II and III respectively. For Kathaltoli, the calculated optimum doses of N were 42, 59 and 84 kg ha^-1, P were 1.0, 2.0 and 5.0 kg ha^-1 and K were 2.0, 23.0 and 33.0 kg ha^-1 for fertility grade I, II and III respectively. The application of predicted fertilizer dose might increase rice yield in all fertility grades of soil in both the locations.

Keywords: Soil fertility grade, Fertilizer dose, Grain yield, Relative yield. T. Aus

Location: Bakerganj upazila under Barisal district and Kathaltoli, Mirjaganj upazila under Potuakhali district

Start Date: 00-04-2009

End Date: 00-07-2009

Program Area: Crop-Soil-Water Management

Commodity: Land management

Objectives:

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

Methodology:

The experimental sites fall under the agroecological zone 13 located at Dodul Mow village in Bakerganj upazila (N 32° 24' 43" E 20° 01' 00") under Barisal district and Kathaltoli, Mirjaganj upazila under Potuakhali district. T. Aus- T. Aman-Fallow is the dominant cropping system in those villages for last 40 years. T. Aus is grown during April to July using both high yielding and local rice varieties. The study was conducted during Aus season 2009 at different soil fertility grades. Soil fertility grades at village levels were assessed through participatory soil fertility appraisal. A farmers meeting with 10 participants were held at each village, representing Aus growing area. The farmers were asked to provide information on village boundaries, rice yield performance in different fields of the village, rice varieties grown and fertilizer uses. The participating farmers sketched a village map, delineating crop fields and uncultivable area. After completion of village map, they sketched a field map and we facilitated the drawing of sub-field boundaries. Each sub-field was occupied several individual plots. The participating farmers divided the entire field into three fertility grades based on yield history and they marked the soil as grade-I, grade-Il and grade-Ill for most fertile, fertile and the least fertile respectively. They grow BR12, BR2 (Mala) and Monsur IRRI, a locally named HYV during the Aus season. All the fields in the village were tidal flooded during the crop season (tidal water depth was 40- 70 cm). Rice seedlings of 25-30 days were transplanted during 5-15 in 2009. Three plots in each soil fertility grade were selected in each site. Each farmer's field represented one replication. The experimental design was a randomized dispersed block. In each farmer's field four treatments: NPK, -N, -P and -K were applied. A portion of 10- x 10-m² area from each field was separated by bund and that portion was equally divided to accommodate four treatments. Soil samples were collected from different plots of variable fertility levels and were analyzed. Soil test based (STB) recommended doses were applied in different gradient of plots. Required amounts of N, P and K were applied as urea, TSP and MP respectively, as per treatment. Full dose of TSP and MP were applied during final land preparation and urea was applied after 15 and 30 days after transplanting at Bakerganj whereas urea super granules (USG) was applied at Kathaltoli. The participating farmers conducted all the field operations. Data on grain yield were recorded from the harvest area of 5 m² per plot and converted into ton per ha. The grain yield was expressed in t ha' at 14% moisture level.

Source of Information: Bangladesh Rice Journal, Vol: 17 (1&2), pp: 1-5, Jan-Dec 2013

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In this study, grain yield and optimum dose of nutrients across the farmers' fields showed spatial variability. The application of appropriate fertilizer dose may increase rice yield in all fertility grades of soil to a certain level, which is possible with farmers' present level of knowledge and minimize cost.

Knowledge Management: Journal