[01] Md Akhter Hossain Chowdhury, Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh, Bangladesh. [02] Tanzin Chowdhury, Department of Agricultural Chemistry, Sher-E-Bangla Agricultural University, Sher-E-Bangla Nagar, Agargaon, Dhaka, Bangladesh. [03] Biplob Kumar Saha, Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh, Bangladesh.

The majority of phosphorous (P) in most acid soils remains in insoluble forms and unavailable to plants. This study aimed to find out the effect of coffee residue amendment on the microbial biomass P accumulation, P availability and its uptake by Italian ryegrass in a low P supplying acid soil. Three levels of P viz., 0, 30 and 80 kg ha^-1 with or without coffee residue were tested in this study. Addition of coffee residue combined with inorganic P significantly influenced the soil microbial biomass C and P, available P, dry matter yield, P content and uptake by Italian ryegrass. The highest microbial C and P, available P, dry matter yield and P uptake by ryegrass were obtained from 80 kg P with coffee residue addition. In contrast, phosphorous use efficiency (PUE) was highest in the plants treated with 30 kg P with coffee residue achieving 78.5% higher PUE over control. Dry matter yield and P uptake by rye grass was significantly and positively correlated with the decrease in microbial biomass P in soil indicating the contribution of this P fraction to the biosynthesis of dry matter and P uptake. The results suggest that organic materials like coffee residue of wide C: P ratio along with low doses of inorganic P could increase the P availability, uptake and use efficiency of plant in low P supplying acid soil.

Coffee Residue, Italian Ryegrass, Acid Soil, Microbial Biomass P, P Uptake

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