N Salahin
Soil Science Division, BARI, Gazipur, Bangladesh
MK Alam
Soil Science Division, BARI, Gazipur, Bangladesh
B Anwar
Soil Science Division, BARI, Gazipur, Bangladesh
ATMAI Mondol
Soil Science Division, BARI, Gazipur, Bangladesh
MJ Alam
Soil Science Division, BARI, Gazipur, Bangladesh
ME Ali
Soil Science Division, BARI, Gazipur, Bangladesh
S Akhter
Soil Science Division, BARI, Gazipur, Bangladesh
Minimum tillage, Crop residue retention, Cropping system
Central Farm, BARI, Joydebpur and RARS, Jashore
Crop-Soil-Water Management
Organic fertilizer, Cropping System
Description of experimental site: The experiment was started at Joydebpur Central Farm, Gazipur and RARS, Jashore during rabi season in 2016-2017, 2017-2018 and 2018-2019. The study area was under the agro-ecological zone “Madhupur Tract” (AEZ-28) and “High Ganges River Floodplain” (AEZ-11). Initial soil properties of the experimental field were determined and information of soil texture, bulk density, soil pH, organic matter, total N, exchangeable K, available P, S, Zn, and B contents at 0-15 cm soil depths were recorded. Treatments and design: The unit experimental plot area was 7.2 m × 4.0 m at Joydebpur and 7.2 m × 5.0 m at Jashore and the design of the experiment was split-plot with four replications. Two tillage practices, such as, T1: conventional tillage (CT) and T2: strip tillage (ST) were assigned in main plot and two levels of crop residue retention was maintained as R+: 30 cm residue retention of rice and wheat and whole amount of mungbean biomass and R-: removal of crop residue (farmers’ practice) were allotted in sub-plot.Land preparation, fertilizer application, seedling transplanting and intercultural operations: At the initiation of the experiment, the plots were separated from each other according to the layout. The strip tillage (ST) was accomplished by PTOS using rotating blades for preparing the strip 20 cm apart and a narrow furrow opener by one pass around 24 hours before transplanting rice whereas ST was done by one pass with PTOS using rotating blades maintaining 20 cm spacing from row to row for wheat. On the other hand, for rice cultivation, puddling was done with three passes with the high-speed rotary tiller followed by laddering twice whereas CT was done by high-speed rotary tiller with three passes followed by two times laddering for wheat sowing. The rates of chemical fertilizers were N136P25K80S10Zn1.5B1.0 and N131P16K60S11Zn2B1 kg ha-1 for wheat, N20P22K32S12Zn1B1 and N20P14K24S13Zn2B1 for mungbean whereas N68P8K48S7Zn1 and N66P7K33S8Zn1 for T. Aman rice, respectively at Joydebpur and at Jashore, according to STB followed by FRG-2012. For T. Aman rice, all fertilizers except urea were applied as basal dose and urea was applied at 3 equal splits at 5 DAT, 28 DAT and 46 DAT. For mungbean, whole amount of fertilizers was applied as basal dose. In case of wheat, whole amount of the fertilizers except urea was applied as basal dose whereas urea was applied in three equal splits at 6, 20 and 50 days after sowing (DAS). Varieties of the tested crops used in the experiments were BARI Mung- 6 of mugbean, BRRIdhan 72 of T. Aman for Joydebpur and BRRIdhan 62 of T. Aman for RARS, Jashore and BARI Gom 30 of wheat. Mungbean seeds were sown on 03 April 2018, T. Aman seedlings were transplanted on 20 & 13 July 2018 maintaining 20 cm × 20 cm spacing whereas wheat seeds were sown on 18 & 25 November of 2018 at 20 cm apart from rows continuously, respectively at Joydebpur and Jashore. After that hand weeding (just uprooting the weeds by hand, therefore, no soil pulverization occurred in ST practice) was done once only at 25th DAS. Crop harvesting and data collection: Due to heavy rainfall, the mungbean at Joydebpur was damaged. The crop, mungbean was harvested on 25 June 2018 at Jashore, T. Aman rice was harvested on 14 November 2018 and 24 October 2018 and wheat was harvested on 17 & 27 March of 2019 at Joydebpur and Jashore, respectively. Two square meter area from each plot was selected for data collection. Ten plants of each plot were selected for yield contributing data. Thousand grain weights was measured plot wise. The whole plant was cut at ground level from R- plots whereas 30 cm of wheat straw was retained in the R+ plots. The grain and straw was separated, sun-dried and weighed from 1.0 m2 area of each plot. The amount of residue retained in the R+ plots was found from 1.0 m2 area. Finally, the grain and straw were converted into t ha-1. Statistical analysis. All the crop data and soil properties at selected depths were statistically analyzed using a split-plot design. Treatment effects on measured variables were tested by analysis of variance (ANOVA), and comparisons among treatment means were made using the least significant difference (LSD) multiple range test calculated at 5% level of probability (P ≤ 0.05). Statistical procedures were carried out with the software program “Statistix for Windows (1998)”.
Annual Report 2018-2019, BARI, Gazipur, Bangladesh
Report/Proceedings