Author：Su-Chen Lin^1,* and Shu-Jing Yan²

Abstrct：

    Biofertilizers often showed unstable responses in field trials with two extremes, i.e., effective and non-effective. This experience gave farmers weak confidence in biofertilizers. From 2017, commercial phosphate-solubilizing biofertilizers (PSB) were purchased and evaluated their growth efficacy by pot culture (Zinnia angustifolia) in Taiwan Agricultural Research Institute (TARI). The test soils were red soils and calcareous soils. Totally, 14 phosphate-solubilizing biofertilizer products and their carriers were evaluated in this report. The test results conducted in calcareous soil indicated that inoculation of PSB #4 could increase 0.9 flower number and 58% phosphate absorption to the upper ground biomass. Besides, the carrier of PSB #4 could increase 0.9 flower number and 43% phosphate absorption to the upper ground biomass as well. Inoculation with PSB #10 had no influence to flower number, but could increase 13% dry weight and phosphate absorption 24% to the upper ground portion. However, the carrier of PSB #10 could increase 0.5 flower number, 15% dry weight and phosphate absorption 31% to the upper ground portion. The other 12 products did not exhibit significant growth effect. The test results conducted in red soils indicated that inoculation of PSB #4 could increase 0.7 flower number and 5% dry weight to the upper ground biomass; however there was no effect in phosphate absorption. The carrier of PSB #4 could increase 1.2 flower number, 14% dry weight and 17% phosphate absorption to the upper ground biomass. Inoculation with PSB #13 had no influence to flower number, but could increase 5% dry weight and phosphate absorption 8% to the upper ground portion. However, the carrier of PSB #13 could increase 12% dry weight and phosphate absorption 8% to the upper ground biomass. The other 12 products did not show any significant growth effect.

Keywords：Phosphate-solubilizing bacteria, Fertility efficacy evaluation

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* Corresponding author, e-mail: linmay@tari.gov.tw
¹ Assistant Researcher, Agricultural Chemistry Division, Taiwan Agriculture Research Institute, Taichung, Taiwan, ROC.
² Research Assistant, Agricultural Chemistry Division, Taiwan Agriculture Research Institute, Taichung, Taiwan, ROC.

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