Soil Application Impacts of Biochar, Compost, and Phosphorus Fertilization on Soybean Crop Productivity and Soil Fertility

El-Kalawy, Samia M.S.; Abu El-Fotoh, Hanan M.; El-Sheref, Ghada F.H.

doi:10.21608/alexja.2025.385557.1142

Soil Application Impacts of Biochar, Compost, and Phosphorus Fertilization on Soybean Crop Productivity and Soil Fertility

Document Type : Original Article

Authors

Soils, Water and Environ. Res. Inst., Agric. Res. Centre, Egypt

10.21608/alexja.2025.385557.1142

Abstract

To examine the effects of compost, biochar, and different phosphorus rates on the growth, yield parameters, and seed quality of soybeans (Glycine max L.), c.v. Giza 111, two field experiments were conducted at EL-Gemmiza, Agricultural Research Station, Agricultural Research Centre, El-Gharbia Governorate, Egypt, during the summer seasons of 2022 and 2023. This experiment included 9 treatments as follows: control treatment without any addition, biochar at 5 ton/fed, biochar at 5 tons/fed +50 % of the recommended rate of phosphorus (RRP), biochar at 5 tons/fed+75 % RRP, biochar at 5 ton/fed +100 % RRP, compost at 5 tons/fed without phosphorus, compost at 5 tons/fed +50 % RRP, compost at 5 tons/fed +75 %RRP, compost at 5 ton/fed +100 % RRP. The tallest soybean plants and the highest number of pods/plant, weight of pods/plant, weight of 100 seeds, yield of seeds/plant, yield of seeds/fed, and straw yield/fed, as well as total protein in seeds, were produced by fertilizing soybean plants grown in clay soil with biochar at a rate of 5 tons/fed. + 75% recommended rate of phosphorus (RRP). This treatment also produced the highest values of N, P, and K uptake by seeds and straw and increased the amount of N, P, and K available in the soil after harvest. The increases in yield of seeds/fed. were about 45.08% and 53.78% for biochar at 5 tons/fed + 75 % RRP over the control in the 1^st and 2^nd seasons, respectively.

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