macronutrientn.

1942 Bot. Gaz. 103 651 An extensive experiment in plant nutrition was designed in order to examine the effects of varying concentrations of macro-nutrient elements in the nutrient medium on the ascorbic-acid content of tomato fruits.

1970 Nature 25 July 376/1 The lack of macronutrients especially N, P and K, and sometimes micronutrients.

1991 R. S. K. Barnes & K. H. Mann Fund. Aquatic Ecol. (ed. 2) ii. 32/2 It may be that trace elements are more important than macronutrients for ocean phytoplankton, due to either their low supply or perhaps their toxicity.

1998 National Gardening Apr. 15/2 (advt.) Plants take these three elements, called macronutrients, from the soil.

1968 Arch. Gen. Psychiatry 18 584 (heading) Comparison of macronutrients in the diets of psychotic and normal children.

1979 Brit. Med. Jrnl. 15 Dec. 1529/1 Over the past 30 years workers in the United States and Europe have developed nitrogen and fat sources which, when combined with concentrated glucose solutions, provide the essential macronutrients.

1994 Health Naturally (Nobel, Ont.) Feb.–Mar. 5/1 (advt.) In natural food like an orange, the micro nutrients (vitamins and minerals) are not just isolated actives, they are bound to a complete food complex of proteins, fats and carbohydrates (these are called macro nutrients).