Effect of Pot Substrate Volume and Nitrogen Concentration of The Nutrient Solution on Lettuce Production under Urban Conditions

Urban Farm DB summary

This study investigated the effect of five nitrogen levels (80-160 ppm) and two pot volumes (6 L, 8 L) on lettuce (cv. Robinson F1 hybrid) in Giza, Egypt, during autumn 2022 and 2023. Increasing substrate volume from 6 L to 8 L and nitrogen concentration from 80 ppm to 140 ppm increased vegetative growth and yield. The 8 L volume and 140 ppm nitrogen concentration yielded the highest results for vegetative growth, yield, and nutrient content. However, 6 L pot volume with 80 ppm nitrogen achieved the highest net profit despite lower fresh weight, by providing the lowest nitrogen use efficiency and natural resource consumption.