Dynamic growth pattern and exploitation of soil residual P by Brassica campestris throughout growth cycle on a calcareous soil

X. Jiao, H. Li, Zed Rengel, F. Zhang, J. Shen

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    © 2015 Elsevier B.V. Plant biomass, root growth and phosphorus (P) uptake can be strongly influenced by soil P availability; large amounts of P accumulate as residual P in agricultural soils due to over-application of fertilizer P. However, the dynamics of plant growth and P uptake in response to different residual P supply gradients during the whole growth cycle is not fully understood. Here, a 2-year field experiment with Brassica campestris was conducted to characterize the dynamic pattern of biomass accumulation and P uptake rates with different residual P supply throughout the growth cycle. The plants grown in the high residual-P treatment had greater biomass production and P uptake than the low residual-P plants throughout the growth cycle. The corresponding average rates of plant growth and P uptake were higher in high than low residual-P treatments till flowering, but no differences were observed thereafter. The rates of plant growth and P uptake increased with growth stages before flowering and then decreased. The maximum differences in plant growth and P uptake rate between low and high residual-P treatments were found at the flowering stage. Compared with low P supply, high residual-P supply enhanced root dry weight over time. Time of attaining maximum average daily biomass production rate was delayed by about 4 days at low soil residual-P supply. The results indicated that soil residual-P supply intensity regulated biomass production, growth rate, P uptake rate and the time of attaining maximum average daily biomass production rate, depending on growth stages. It is suggested that exploration of soil residual P by plant is closely associated with growth stages and the soil residual P supply intensity.
    Original languageEnglish
    Pages (from-to)110-117
    JournalField Crops Research
    Volume180
    DOIs
    Publication statusPublished - 2015

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