The Joint Application of Phosphorus and Ammonium Enhances Soybean Root Growth and P Uptake

Ciro Antonio Rosolem, Thiago Barbosa Batista, Patrícia Pereira Dias, Laudelino Vieira da Motta Neto and Juliano Carlos Calonego
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Ciro Antonio Rosolem: Department of Crop Science, School of Agricultural Sciences, São Paulo State University, 3780 Universitaria Av., Botucatu 18610-034, Brazil
Thiago Barbosa Batista: Department of Crop Science, School of Agricultural Sciences, São Paulo State University, 3780 Universitaria Av., Botucatu 18610-034, Brazil
Patrícia Pereira Dias: Department of Crop Science, School of Agricultural Sciences, São Paulo State University, 3780 Universitaria Av., Botucatu 18610-034, Brazil
Laudelino Vieira da Motta Neto: Department of Crop Science, School of Agricultural Sciences, São Paulo State University, 3780 Universitaria Av., Botucatu 18610-034, Brazil
Juliano Carlos Calonego: Department of Crop Science, School of Agricultural Sciences, São Paulo State University, 3780 Universitaria Av., Botucatu 18610-034, Brazil

Agriculture, 2022, vol. 12, issue 6, 1-9

Abstract: It has been shown that the joint application of phosphorus (P) and ammonium (N-NH + 4 ) increases maize root proliferation and P acquisition by maize in alkaline soils, but this has not been shown in acidic soils for legumes. A greenhouse experiment was conducted to assess the effect of the joint application of P and NH 4 + on soybean root growth and P acquisition. Soybean was grown in glass-walled pots without P, with monoammonium phosphate (MAP) and triple super phosphate (TSP) applied on the soil surface or localized. The soil P increased irrespective of the P source and localization. The rhizosphere pH was decreased by MAP, while the soil bulk pH was not affected. The TSP increased the root length by 55% and MAP by 76% over the control, and the number of root tips increased by 21% with TSP, 58% with MAP applied on the soil surface, and 78% with MAP localized. The soybean dry matter, N and P uptake, and P use efficiency were increased by P fertilization, mainly with MAP localized. The joint application of P and ammonium decreases the soybean rhizosphere pH, which results in root proliferation early in the cycle, and eventually in higher P uptake and use efficiency.

Keywords: Glycine max; root architecture; phosphorus acquisition; phosphate fertilizer (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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