The effect of biochar application along with potassium fertilizer on soil K status, rice yield and yield components in two K-depleted paddy soils

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Document Type : Research Paper

Authors

1 Department of Soil Science, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Department of Soil Science, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Abstract

This study aimed to evaluate the effect of combining normal and acidic rice straw biochars with potassium fertilizer on the potassium status, yield, and yield components of rice in two potassium-depleted paddy soils.This experiment was conducted using a completely randomized design as a factorial with two factors:biochar levels(at three levels of 0(B0),1 percent normal biochar(NB1) and1 percent acidic biochar(AB1))and potassium fertilizer levels(at five levels of 0, 25%, 50%, 75%, and 100% of the fertilizer recommendation)in three replications, resulting in a total of15 treatments across two paddy soils with different textures under Shirodi rice cultivation.The results showed that the addition of normal and acidic biochars(NB1 and AB1), along with varying amounts of potassium fertilizer(K0, K25, K50, K75, and K100), increased the potassium content, yield, and yield components of rice.Therefore, the NB1K50 treatment had the greatest ability to enhance the potassium concentration in biomass and rice grain in both clay loam and sandy loam soils.The NB1K50 treatment also achieved the highest plant height and1,000-seed weight in both soils.The highest plant biomass yield was obtained with the application of AB1K100, and the highest rice grain yield resulted from the application of NB1K100 in clay loam and sandy loam soils.Overall, it seems that the combined application of biochar and potassium fertilizer has increased the potassium content in different parts of the rice plant and has enhanced plant growth and yield.Biochar contains a substantial amount of activated potassium that can serve as a soil amendment agent to provide potassium to crops in the short term.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 25 August 2025

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