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Gewählte Publikation:

Kaul, HP; Ebrahimi, M; Vollmann, J.
(2021): On the Importance of Soybean Seed P for Shoot P Uptake before Anthesis
AGRONOMY-BASEL. 2021; 11(6), 1233 FullText FullText_BOKU

Phosphorus (P) is an important macronutrient required for crop growth but a finite resource in agriculture. The objective of this study was to examine the effects of soybean seed size and seed P content on growth and P accumulation up to anthesis (30-40 DAP). Pot experiments were carried out in a greenhouse with 15 soybean genotypes of different seed size (TKW 146-304 g) and with two substrates differing in plant available P, i.e., low P (LP) at 6.17 mg kg(-1) vs. high P (HP) at 68.12 mg kg(-1) CAL-P. The observations included measurements of seed and shoot dry matter and P concentrations as well as root characteristics. In the case of LP, shoot P accumulation relied, to a large degree, on seed P reserves during the vegetative growth period. In the case of HP, however, the role of seed P is negligible with regard to absolute P uptake. Yet, a very close linear relationship between seed P and shoot P uptake was also confirmed at HP. Some genotypes reacted more positively than others on HP in biomass production and P uptake, but none of the selected genotypes showed an outstanding biomass production or P uptake under LP. Total root length or root surface area of soybean did not explain differences in P uptake between genotypes at either P supply level. Overall, no substantial genotypic differences were observed in P use efficiency under P deficiency apart from the effect of seed P reserves. We conclude that seed size can be considered an important trait when screening genotypes for fast early P accumulation and growth.
Autor*innen der BOKU Wien:
Ebrahimi Meysam
Kaul Hans-Peter
Vollmann Johann

Find related publications in this database (Keywords)
P deficiency
root length

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