Vegetable Crops in Relation to Soil Fertility

Publisher Website
Google Scholar
Abstract
New Zealand spinach, compared with other leafy vegetables as a “protective” food, is a poor source for vitamin C. Its low calcium and magnesium concentrations with an extremely high oxalate content suggest a negative mineral contribution; there is likely a precipitation of quantities of calcium derived from other foods consumed, tantamount to from four to six times that furnished by the plant itself. The response of the crop to nitrogen fertilization was (1) practically independent of the soil calcium, and (2) reflected by an increased yield of vegetation which generally became progressively inferior in nutritional value with each increment of nitrogen. New Zealand spinach is at the bottom of the list of green leafy vegetables insofar as its vitamin C and calcium contributions are concerned.

This publication has 0 references indexed in Scilit: