A Barman
Soil Science Division, BARI, Gazipur, Bangladesh
S Shome
Department of Agronomy, SAU, Dhaka, Bangladesh
MR Khatun
Soil Science Division, BARI, Gazipur, Bangladesh
MM Masud
Soil Science Division, BARI, Gazipur, Bangladesh
S Akther
Soil Science Division, BARI, Gazipur, Bangladesh
Cropping system; Fertilizer; Marginal benefit cost ratio; Rice; Yield
Farming System
Performance, Cropping System
The field experiment was executed at the central farm of RARS, Jashore (AEZ 11) during 2017- 18 and 2018-19. The initial soil samples from 0-15 cm depth were collected and analyzed before establishing the experiment. The experiment was conducted in a randomized complete block design with three replications. Eight different treatments viz. T1: 100% NPKSZnB (STB), T2: T1 + 25% N, T3: T1 + 25% NP, T4: T1+ 25% NK, T5:T1+ 25% PK, T6:T1+ 25% NPK, T7: 75% of T1, T8: Native fertility was applied in different plots having sizes of 4.2m x 3m each. The STB fertilizer dose for mustard, boro, T. Aus and T.Aman is N138P22K25S0Zn1.85, N186P30K23S30Zn0, N90P15K2.17S23Zn0, and N159P30K7S24Zn0, respectively. Mustard crop (var. BARI Sarisha-14) was used as a test crop for the first component of the pattern. Mustard seeds were sown in line with 30 cm row to row on November 06, 2017, and November 07, 2018. Fertilizer N-P-K-S-Zn and B were supplied from urea, TSP, MP, Gypsum, Zinc sulphate, and Boric acid respectively. All PKSZnB and 1/3 of N were applied at the time of final land preparation. The remaining two-thirds of N was applied as top-dressing at 30 and 60 days after sowing. Three irrigation and other intercultural operations were done as and when required. The mustard was harvested on January 28, 2018, and January 27, 2019. After mustard, BRRI dhan28 was transplanted in the same plots on February 3, 2018, and February 2, 2019, with a row to row spacing of 20 cm and plant to plant spacing of 15 cm. All fertilizers including 1/3rd of N were applied before transplanting. The rest of N was applied in two installments at 15 and 45 days after transplanting. For T. Aus rice, the variety BRRI dhan48 was used in the experiment. Transplanting was done on May 15, 2018, and May 14, 2019, with a row to row spacing of 20 cm and plant to plant spacing of 15 cm. All fertilizers including 1/3rd of N were applied before transplanting. The rest of N was applied in two installments at 15 and 45 days after transplanting. For T. Aman rice, the variety BRRI dhan57 was used in the experiments. Transplanting was done on July 29, 2018, and July 28, 2019, with a row to row spacing of 20 cm and plant to plant spacing of 15 cm. T. Aman rice was harvested on November 4, 2018, and November 5, 2019. Data on yield and yield contributing characters were recorded and analyzed using Statistix 10 software. The means were separated using the least significant difference (LSD) at the 5% level of significance. Rice equivalent yield is determined by the following equation Rice equivalent yield of a crop = Yield of that crop (t ha-1) × unit price of that crop/ Unit price of rice. Gross return from this rice-based cropping system was calculated by multiplying the yield of crops with their market price. Total variable cost included the fertilizer cost. The gross margin was calculated by subtracting the variable cost from the gross return. Marginal Benefit-Cost Ratio (MBCR) was calculated by dividing the marginal value product by total variable cost.
Bangladesh Agron. J. 2021, 24(1): 109-117
Journal