Effects of Salinity and Nutrient Deficiency Determined for Spinach (image) American Society for Horticultural Science Share Print E-Mail Caption Spinach plants are shown four weeks after treatments in which they were deprived of nitrogen, phosphorous, or potassium. The study recommended ways to improve the nutritional value of spinach. Credit Photo courtesy of Chenping Xu. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.