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Crop recovery efficiency of applied phosphorous under different nitrogen applications and the contribution of these two nutrients to seed production in soybeans

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Abstract

Aims

Plant phosphorus (P) recovery of applied P (PF) is a critical factor for seed production in soybeans [Glycine max (L.) Merr.], but the quantitative effect of nitrogen (N) application (NF) on P-recovery is not established. This study aimed to model the relationship between P-uptake (PA) and PF in soybeans under varying NF conditions.

Methods

Pot experiments were conducted using nodulated [Lee( +)] and non-nodulated [Lee(–)] soybeans under multiple levels of basal-dressed PF and top-dressed NF from the full-bloom to the beginning-maturity stages.

Results

PA at each NF was represented by a function of PF as a straight-line with a positive-slope and an intercept of soil P (PS) connecting with a ceiling-line due to plant P-uptake capacity. The apparent crop recovery efficiency of PF [RE = (PA – PS) / PF] at the slope-phase asymptotically increased with NF. As a result, PA was represented by the single-function PF × RE, which consisted of a 1:1 slope and a ceiling across different NF rates. Seed weights increased with NA for both nodulation types, but the responses of seed yield to PA in Lee(–) differed due to NA. PA asymptotically increased the maximum NA and N fixation by nodulation, and was approximated by the N quantitative model.

Conclusion

PA can be represented as a function of PF by excluding P retained in soils, which is influenced by NF and the capacity for P uptake. Accordingly, P uptake affects seed production via N uptake, which is determined by fertilizer, soil, and fixed N.

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Abbreviations

NA :

Nitrogen assimilation

NAmax :

Maximum nitrogen assimilation

NF :

Applied fertilizer nitrogen

NFIX :

Fixed nitrogen

NFIXmax :

Maximum fixed nitrogen

NS :

Available soil nitrogen

PA :

Plant phosphorus uptake

PAmax :

Maximum plant phosphorus uptake

PF :

Applied phosphorus by fertilizer

PS :

Available phosphorus in soil

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Acknowledgements

We are grateful to Dr. Shingo Matsumoto (Faculty of Life and Environmental Science, Shimane University) for his valuable comments and suggestions.

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Correspondence to Jin Kakiuchi.

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Responsible Editor: Terry James Rose.

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Kakiuchi, J., Kobata, T. Crop recovery efficiency of applied phosphorous under different nitrogen applications and the contribution of these two nutrients to seed production in soybeans. Plant Soil 480, 583–601 (2022). https://doi.org/10.1007/s11104-022-05605-z

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  • DOI: https://doi.org/10.1007/s11104-022-05605-z

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