The trial was conducted in the farmers’ field of Multilocation Testing Site, Sherpur, Bogura during Rabi season of 2020-21 to develop a suitable fertilizer recommendation for maize in Maize- T. Aus- T. Aman rice cropping pattern. For the first crop (maize), the treatments were T1: STB dose, T2: T1 + 25% extra NPK, T3: T1 + 50% extra NK, T4: IPNS based on T1 @5 tha-1 of cowdung and T5: IPNS based on T3 @5 tha-1 of cowdung. According to the treatment specifications, the STB and other doses were estimated. Treatments were assigned randomly, and fertilizer doses were applied accordingly following RCB design. Maximum grain yield (8.56 tha-1) was recorded from T3 treatment that was statistically similar to T2 and T5 and the minimum (6.92 t ha-1) from T4 treatment. Similar trend was observed for stover yield also. The highest gross return (Tk. 182750 ha-1) was amounted from T3 treatment against the cultivation cost of Tk. 110454 ha-1 that together led to the higher gross margin amounting Tk. 72256 ha-1. Lower gross return (Tk. 147640 ha-1) as well as gross margin (Tk. 38768 ha-1) was obtained from the T4 treatment.
Key words: Fertilizer, maize, inorganic, organic. Karatoa Bangali Floodplain.
Bangladesh is a densely populated (1008 per sq. km.) country of the world with an area of 1,47,570 sq. km and the present population is about 170 million, with an increase annually at the rate of about 1.42% per year (BBS 2018). The major challenge for the agriculture sector of Bangladesh is to increase and sustain crop yield and production. This is possible through cropping intensification with high yielding varieties of balanced fertilizer and proper soil fertility management. The present soil fertility status of Bangladesh is alarming. Use of Organic manures to meet the nutrient requirements of the crop would be an inevitable practice in the years to come for sustainable agriculture since organic manures not only improve the soil physical, chemical, and biological properties (Nambiar et al., 2011). Fertilizers, manures, and other amendments either alone or in combinations could be used to develop a nutrient supplying capacity of the soil (Madhvi and Deepa Sharma, 2020). Several studies indicated that combined use of chemical fertilizer with manure could increase yield and economic returns compared with fertilizer or manure alone (Zhang et al., 2012). The application of poultry manure increasing the pH, P, K, Ca, Mg, and Mn, in the soil, more effectively when compared to other animal manures. In rice-based cropping system Maize-T. Aus-Taman is one of the major cropping patterns in Sherpur Upazila of Bogura which cover around 1330 hectare of land. The present cropping intensity of Sherpur is 251% by improving the present cropping pattern. Sustainable crop production in Bangladesh through the improvement of cropping patterns in rice-based cropping systems is regarded as increasingly important in national issues such as food security, poverty alleviation, and creation of job opportunities. Thus, it is necessary to find out the optimum fertilizer dose for maize in Maize-T.Aus-T.Aman cropping pattern in the Bogura region. Hence the program was undertaken to find out a suitable and economic fertilizer dose for sustainable crop productivity and soil fertility for maize in Maize-T. Aus-T. Aman cropping pattern and increase the productivity and income of the farmers