Phosphorous Acid Labeling Aid

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PHOSPHOROUS ACID LABELING AID 1. Does your product contain only phosphorous acid (H3PO3)/Phosphite as a source of phosphorus? Adhere to the format presented in § 2309(a). i. X% Total phosphoric acid must be guaranteed. Total Phosphoric Acid (P2O5) % ii. State phosphate as zero in the grade (N-0-K) or include an asterisk (N-P*-K) to clarify the phosphorus stated in the grade is not in the available phosphate form. iii. Include required statements according to § 2309(a)(1)(2)(3). If an asterisk is used in the grade, an asterisk must be used before each required statement (e.g. “*(1) Phosphorous acid products…”, “*(2) Upon foliar…”). 2. Does your product contain BOTH phosphorous acid (H3PO3)/phosphite AND phosphoric acid (H3PO4)/phosphate? Adhere to format presented in § 2309(b): i. X% Available phosphoric acid must be guaranteed. Available Phosphoric Acid (P2O5) % ii. X% Total phosphoric acid must be guaranteed. % Total Phosphoric Acid (P2O5) iii. X% Insoluble phosphoric acid must be guaranteed (if present). % Insoluble Phosphoric Acid (P2O5) iv. Report percentage of available phosphate in the grade. v. Include heavy metals statement on the label and submit heavy metals analysis. vi. Include required statements according to § 2309(a)(1)(2)(3). Required statements [§ 2309(a)(1)(2)(3)]: (1) Phosphorous acid products are for use as a supplemental fertilizer treatment. (2) Upon foliar application, the phosphite ions are taken up directly by the plant foliage and may undergo a degree of conversion to phosphate ions, or will be used directly by plants, as phosphite ions. (3) As a soil application to annual crops, a lesser response from the initial crop, with a corresponding superior response from succeeding crops, may be observed. In addition, placement close to seeds or root zones may be injurious to crops. The effect may be aggravated by a soil pH below 6.5. Note: Authority cited: Sections 407, 14502 and 14631, Food and Agricultural Code (FAC). Reference: Section 14631, FAC. Rev. 10.02.2019 Page 1 .

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