Abstract

The experiment was conducted to measure crop yields, nutrient concentration, nutrient uptake and balance by using different nutrient management practices for mustard-mungbean-T. aman rice cropping system in calcareous soil of Madaripur, Bangladesh. Different nutrient management practices were absolute nutrient control (T₁); farmer’s practice (T₂); AEZ based nutrient application (T₃) and soil test based nutrient application (T₄). The practices were compared in a randomized completely block design with three replications over two consecutive years. The average yield through application of soil test based nutrient (T₄) was showed effective to get highest yields of mustard (1530 kg ha^-1), mungbean (1632 kg ha^-1) and T. aman rice (4729 kg ha^-1). The same practices (T₄) exhibited the greatest nutrients uptake by the test crops. The apparent balance of N and K was negative; however it was less negative and less deficiency detect in T₄ treatment. Positive balance of P observed in all practices except in T₁. There was a positive S balance (7.60 kg ha^-1) in T₄ but negative in T₁, T₂ and T₃. Zinc balance was found positive in T₃ and T₄ and negative in T₁ and T₂. Boron balance in the system was neutral or slightly positive in T₁ and negative in T₂ but positive in T₃ and T₄. Organic matter, N, P, S, Zn and B status in soil was improved by T₄ treatment. The results suggested that the soil test based nutrient application is viable and sustainable for mustard-mungbean-T. aman rice cropping system in calcareous soils of Bangladesh.

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