TITLE XL AGRICULTURE, HORTICULTURE AND ANIMAL HUSBANDRY
CHAPTER 431 SOIL AND PLANT ADDITIVES
Fertilizers
Section 431:4-b
431:4-b Phosphorus Content of Fertilizer. –
I. No fertilizer sold at retail that is intended for use on turf shall exceed a content level of 0.67% available phosphate unless specifically labeled for establishing new lawns, for repairing a lawn, for seeding, or for use when a soil test indicates a phosphorus deficiency.
II. No fertilizer sold at retail that is intended for use on newly established or repaired lawns, or for lawns testing deficient in phosphorus shall exceed an application rate of one pound per 1,000 square feet annually of available phosphate.
III. No natural organic turf fertilizer shall exceed a per application rate of one pound of available phosphate per 1,000 square feet when applied according to the instructions on the label.