The intensification of agricultural land use, along with the cultivation of modern crop varieties, has witnessed a significant upswing in Bangladesh. Unfortunately, this surge has taken a toll on soil fertility, leading to the emergence of deficiencies in both macro- and micro-nutrients for crops. In light of these concerns, a study was conducted to assess the impact of applying zinc (Zn) and boron (B) on the yield of T. Aman and boro rice while determining the optimal Zn and B application rates for the T. Aman – boro cropping pattern in AEZ 9. Soil samples from the experimental site were collected and subjected to analysis for fundamental soil properties, including pH and organic matter content, macronutrients such as nitrogen (N), phosphorus (P), potassium (K), and sulfur (S), as well as micronutrients like Zn and B. All analyses were conducted in accordance with established standard methods. For T. Aman, there were four treatments, denoted as (T1:  Zn0B0, T2:  Zn2B1.5, T3:  Zn4B2, andT4:  Zn6B3), while six treatments were applied to Boro rice, named T1.1 (Zn0B0), T2.1 (Zn2B2), T2.2 (Zn0B0), 3.1 (Zn4B2), T3.2 (Zn0B0) and T4.1 (Zn0B0), with subscripts indicating the application rate in kg per hectare. Each treatment was replicated three times, and consistent rates of nitrogen, phosphorus, potassium, and sulfur were applied to all plots. Zn and B treatments were imposed during both the first and second crop cycles, as indicated above, with Zn being supplied as ZnSO4 and B as H3BO3. The results indicate that applying Zn @4 kg ha-1 and B @ 2 kg ha-1 to the first crop, or Zn@2 kg ha-1 and B      @2 kg kg ha-1 for both the first and second rice crops, can yield the highest grain production in the rice-rice cropping pattern.

Key words: Zn and B requirements, T. aman, Boro rice.

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