Section 250-RICR-40-20-10.3 - Plant Nutrients in Addition to Nitrogen, Phosphorus and PotassiumA. Other plant nutrients, when mentioned in any form or manner shall be registered and shall be guaranteed. Guarantees shall be made on the elemental basis. Sources of the elements guaranteed and proof of availability shall be provided the Director upon request. The minimum percentages which will be accepted for registration are as follows: Element | % | Element | % |
Calcium (Ca) | 1.00 | Copper (Cu) | 0.05 |
Magnesium (Mg) | 0.50 | Iron (Fe) | 0.10 |
Sulfur (S) | 1.00 | Manganese (Mn) | 0.05 |
Boron (B) | 0.02 | Molybdenum (Mo) | 0.0005 |
Chlorine (Cl) | 0.10 | Sodium (Na) | 0.10 |
Cobalt (Co) | 0.0005 | Zinc (Zn) | 0.05 |
B. Guarantees or claims for the plant nutrients listed in § 10.3(A) of this Part are the only ones which will be accepted. Proposed labels and directions for the use of the fertilizer shall be furnished with the application for registration upon request. Any of the above listed elements which are guaranteed shall appear in the order listed immediately following guarantees for the primary nutrients of nitrogen, phosphorus and potassium.C. A warning or caution statement is required on the label for any product which contains three one hundredths of one percent (0.03%) or more of boron in water soluble form. This statement shall carry the word "warning" or "caution" conspicuously displayed, shall state the crop(s) for which the fertilizer is to be used, and state that the use of the fertilizer on any other than those recommended may result in serious injury to the crop(s).D. Products containing one one thousandth of one percent (0.001%) or more of molybdenum also require a warning statement on the label. This shall include the word "warning" or "caution" and one (1) statement that the application of fertilizers containing molybdenum may result in forage crops containing levels of molybdenum which are toxic to ruminant animals.E. Example of Warning or Caution Statements: 1. Boron: a. Directions: Apply this fertilizer at a maximum of three hundred fifty (350) pounds per acre for alfalfa or red clover seed production. Caution: do not use on other crops. The boron may cause injury to them.b. Caution: Apply this fertilizer at a maximum rate of seven hundred (700) pounds per acre for alfalfa or red clover seed production. Do not use on other crops; the boron may cause serious injury to them.c. Warning: This fertilizer carries added borax and is intended for use only on alfalfa. Its use on any other crops or under conditions other than those recommended may result in serious injury to the crop.2. Molybdenum: Caution: This fertilizer is to be used only on soil which responds to molybdenum. Crops high in molybdenum are toxic to grazing animals (ruminants).
250 R.I. Code R. 250-RICR-40-20-10.3
Amended effective 1/5/2022