Nutrient Interactions and Deficiency Diagnosis in the Lettuce

Abstract

A sand-culture experiment with lettuces is described, having as its principal purpose the study of the relationship between the potential responses of plants to applications of nitrogen, phosphorus, and potassium fertilizers and the composition of. their foliage. Plants were supplied initially with five levels of these nutrients in all combinations, samples of plant material were taken fot analysis at various stages of development, and at 44 days from sowing additional quantities of nutrients were supplied to some of the cultures in order that their response potentialities might be determined. The present paper analyses the effects of the nutrient interactions on plant dry weight, further results being left to subsequent papers.