S. Bilkis*
Sylhet Agricultural University, Sylhet, Bangladesh
M.R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
M.M. Rahaman
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
Cowdung, Poultry manure, Trichocompost, Vermicompost, Rice yield, Soil fertility
At the soil science field laboratory of Bangladesh Agricultural University (BAU), Mymensingh for two consecutive years, 2012 and 2013
Crop-Soil-Water Management
Fertilizer and manures
The experiment was conducted at the soil science field laboratory of Bangladesh Agricultural University (BAU), Mymensingh for two consecutive years, 2012 and 2013. The experimental site was situated at 24.750 N latitude and 90.50 E longitude. The soil belongs to Sonatala series under agro-ecological zone (AEZ) 9, known as Old Brahmaputra Floodplain (FAO/UNDP, 1988). The soil was silt loam in texture having 6.29 pH, 1.85% OM, 0.124% total N, 3.96 mg kg-1 available P, 0.11 cmol kg-1 exchangeable K and 11.9 mg kg-1 available S. Variety BRRI dhan29 and BINA dhan 7 was used for Boro and T. Aman rice, respectively. The experiment was laid out in a randomized complete block design (RCBD), with three replications. There were eight treatments. Treatments T3-T8 received a definite amount of nutrients from different types of manure and the rest amount of nutrients came from chemical fertilizers so that the rate of every nutrient application was the same over the fertilizer and manure + fertilizer treatments. The fertilizer doses were rationalized for the second crop, as outlined in the Fertilizer Recommendation Guide (FRG, 2012). The rate of manure application was 5 t ha-1 for cowdung, its slurry, and tricho- and vermi compost, and 3 t ha-1 for poultry manure and its slurry. Full amount of P, K and S fertilizers was applied as basal during final land preparation and urea was applied in 3 equal splits - the one-third during final land preparation and the two-thirds during tiller and panicle initiation stages of crop growth. All types of manure were applied seven days before transplanting. Thirty five days’ old seedlings were used for transplanting of both Boro and T.Aman rice. Boro rice was transplanted on 24 January in 2012 and 28 January in 2013 and was harvested correspondingly on 20 May 2012 and 22 May 2013. T.Aman rice was transplanted on 6 August 2012 and 28 July 2013 and harvested respectively on 8 November 2012 and 9 November 2013. Weeding and irrigation were done whenever required. At maturity, the crop was harvested and agronomic data viz. plant height, tillers hill-1, panicle length (cm), grains panicle-1, 1000-grain weight (g) and grain and straw yields were recorded. Grain yield was expressed at 14% moisture basis and straw yield at sun dry basis, drying was done for a period until a constant weight was obtained. The grain and straw samples were collected, dried and ground for analysis of N, P, K & S contents following standard methods (H2SO4 digestion for N and HNO3-HClO4 digestion for P, K & S). Nutrient uptake by the grain and straw was calculated by multiplying their percent concentration with the corresponding yield. Composite soil samples were collected from every plot and prepared for chemical analysis. Soil pH was measured by glass electrode pH meter with soil-water ratio 1:2.5 (McLean, 1982), organic matter by wet oxidation method (Nelson and Sommers, 1982), N by Micro-Kjeldahl method (Bremner and Mulvaney, 1982), P by 0.5M NaHCO3, pH 8.5 extraction method (Olsen and Sommers, 1982), K by NH4OAc, pH 7.0 extraction method (Barker and Surh, 1982), S by 0.15M CaCl2 extraction method (Page et al., 1982), Zn by 0.005M DTPA, pH 7.3 extraction method (Lindsay and Norvell, 1978) and hot water-0.02M CaCl2 method (Page et al., 1982). All data were analyzed statistically by MSTATc computer programme following the F-test and the mean comparisons of the treatments were done by Duncan’s Multiple Range Test (DMRT) at 5% level.
SAARC J. Agri., 15(2): 147-161 (2017)
Journal