Optimum Application Rate of Nitrogen, Phosphorus, and Potassium Fertilizers for Kenaf (Hibiscus cannabinus L.) Yield and Soil Chemical Properties in a Reclaimed Paddy Soil: A Pot Experiment
2023
Yoon, S.H. | Park, S.Y. | Choi, S.W. | Jeon, S.H. | Oh, K.K. | Kim, S.Y.
Kenaf (Hibiscus cannabinus L.) has been considered one of the alternative crops for bioenergy production, potentially replacing fossil fuel. However, there are few studies available on systematically investigating kenaf growth characteristics and its fertilization conditions so far. Our study investigated its biomass productivity and soil properties at the different fertilization regimes including three major treatments (N, P₂O₅, and K₂O) with four application levels [0%-50%-100% (as recommended), and 200%] in a reclaimed paddy soil during pot experiment under upland condition in 2021. The results showed the maximum of kenaf biomass productivity was observed when 158 kg ha⁻¹ of N, 156 kg ha⁻¹ of P₂O₅ and 102 kg ha⁻¹ of K₂O were applied, showing 62.6 g d.w pot⁻¹, 64.1 g d.w pot⁻¹, and 64.9 g d.w pot⁻¹, respectively. Our study revealed that kenaf biomass mainly showed positive correlations with electrical conductivity (EC) and total N contents in soils, suggesting that these could be major growth limiting factors for kenaf production. Our study provides a better understanding for producing the maximum kenaf biomass, filling the gap on a promising nutrient management strategy for its optimum production in southern reclaimed paddy soils.
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