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The Optimal Concentration of KH 2 PO 4 Enhances Nutrient Uptake and Flower Production in Rose Plants via Enhanced Root Growth

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  • Qinghua Ma

    (Experimental Centre of Forestry in North China, Chinese Academy of Forestry, Beijing 102300, China)

  • Xinghong Wang

    (Experimental Centre of Forestry in North China, Chinese Academy of Forestry, Beijing 102300, China)

  • Weijie Yuan

    (Experimental Centre of Forestry in North China, Chinese Academy of Forestry, Beijing 102300, China)

  • Hongliang Tang

    (School of Life Science, Hebei University, Baoding 071002, China)

  • Mingbao Luan

    (Institute of Bast Fiber Crops/Centre of Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China)

Abstract

Monopotassium phosphate is a widely used phosphorus and potassium fertiliser for ornamental plants, but it is not known what concentration will result in optimal flower production, root growth and nutrient uptake of rose plants. We compared potted rose plants fertilised with six different concentrations (0.0 as a water-only control, 1.0, 2.0, 3.0, 4.0 and 5.0 g·L −1 ) of an aqueous monopotassium phosphate solution as a combination of foliar and soil applications over two consecutive flowering cycles. Rose growth, flower production and nutrient accumulation responded differently to fertilisation with different concentrations of monopotassium phosphate. During the first flowering cycle, shoot and root dry weight, leaf chlorophyll content, flower diameter, total root length and surface area, and total fine root length significantly increased in response to increased monopotassium phosphate concentrations from 0.0 to 3.0 g·L −1 but decreased in response to fertilisation with 4.0 or 5.0 g·L −1 monopotassium phosphate. Similar trends were observed in shoot dry weight, leaf chlorophyll content, flower diameter and number, phosphorus and potassium accumulation during the second flowering cycle. According to quadratic equations derived from both flowering cycles, the optimal concentration of monopotassium phosphate, based on flower diameter and dry weight, as well as total phosphorus and potassium accumulation, was 2.6–3.0 g·L −1 . Furthermore, total root length was significantly correlated with flower diameter, flower dry weight, and total phosphorus and potassium accumulation ( p < 0.05). These results indicated that fertilisation with optimal concentrations of monopotassium phosphate can increase rose growth, flower productivity and nutrient uptake through enhanced root growth.

Suggested Citation

  • Qinghua Ma & Xinghong Wang & Weijie Yuan & Hongliang Tang & Mingbao Luan, 2021. "The Optimal Concentration of KH 2 PO 4 Enhances Nutrient Uptake and Flower Production in Rose Plants via Enhanced Root Growth," Agriculture, MDPI, vol. 11(12), pages 1-14, December.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:12:p:1210-:d:692641
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    References listed on IDEAS

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    1. Wang, Xiukang & Guo, Tao & Wang, Yi & Xing, Yingying & Wang, Yanfeng & He, Xiaolong, 2020. "Exploring the optimization of water and fertilizer management practices for potato production in the sandy loam soils of Northwest China based on PCA," Agricultural Water Management, Elsevier, vol. 237(C).
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