Improved chlorophyll fluorescence, photosynthetic rate, and plant growth of Brassica napus L. after co‐application of biochar and phosphorus fertilizer in acidic soil

• Published in: Journal of plant nutrition and soil science 2024-04, Vol.187 (2), p.260-273
• Main Authors: El‐Desouki, Zeinab, Xia, Hao, Abouseif, Yehia, Cong, Ming, Zhang, Mengyang, Riaz, Muhammad, Moustafa‐Farag, Mohamed, Jiang, Cuncang
• Format: Article
• Language: English
• Subjects: acid soil; acid soils; Acidic soils; biochar; Brassica; Brassica napus; Charcoal; Chlorophyll; chlorophyll fluorescence; Crop yield; electron transfer; Electron transport; Fertilizer application; Fertilizers; Incubation; Oilseed crops; Parameters; Phosphorus; phosphorus fertilizers; Photochemicals; Photosynthesis; Photosystem II; Physiochemistry; Plant growth; plant nutrition; Potassium phosphate; Potassium phosphates; Rape plants; Rapeseed; Soil amendment; Soil chemistry; Soil fertility; Soil improvement; Soil pH; Soil properties; soluble phosphorus; Transport rate
• ISSN: 1436-8730; 1522-2624
• DOI: 10.1002/jpln.202300052

Aims Biochar has been used as an amendment to improve soil fertility and increase crop yield. A pot trial and incubation experiment were conducted to evaluate the effects of combined biochar and phosphate fertilizer applications on changes in soil physiochemical properties, photosynthetic parameters, and plant growth of Brassica napus L. in acidic soil. Methods Biochar (B) was applied at rates (B0: 0%, B1: 2%, and B2: 4% w/w) to the soil, while phosphorus (P) as KH2PO4 was added at P0: 0 mg kg–1 soil, P1: 100 mg kg–1 soil, and P2: 150 mg kg–1 soil. Non‐amended soil served as the control (Ck). Results The study found that the maximum photochemical quantum yield of photosystem II (Fv/Fm) and non‐photochemical quenching were affected by biochar and P fertilizer treatments. The Fv/Fm was significantly lower in the Ck while the highest in B2P1. Compared to the Ck treatment, the electron transport rate and photosynthetic rate were significantly increased under the application of biochar with P fertilizer. Additionally, malondialdehyde content declined by 68.9% when biochar was added with P fertilizer treatments. Furthermore, the plant P content and plant growth parameters were significantly increased. Biochar with and without P fertilizer treatments increased soil pH significantly, compared to the application of P fertilizer alone. Water‐soluble P decreased with incubation time, while Al‐P decreased significantly by 69.9% and 76.4% under B1 and B2 treatments, respectively, compared to CK. Conclusion The findings revealed a positive effect of the combined application of biochar with phosphate fertilizer on the growth of oilseed rape in acidic soil.