Consideration of total available N supply reduces N fertilizer requirement and potential for nitrate leaching loss in tomato production

Effects of increasing total available N (TAN) on agronomic performance, apparent recovery of TAN (ARTAN), NO3− leaching and soil mineral N accumulation were examined in two tomato crops. Total available N was considered to be the sum of soil mineral N at planting, N mineralized from organic material (soil organic matter and manure), and mineral N fertilizer applied by fertigation. In each crop, four different mineral N fertilizer rates were...