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During 2016 & 2017 seasons, Zaghloul date palms received three slow release N fertilizers namely Sulphur-coated urea (41 %N), Phosphorus-coated urea (37.11%N) and Urea-formaldehyde (41%N) versus urea (46 %N) as fast release N fertilizer. Both slow and fast release N fertilizers were applied at 250, 500 or 1000g N/palm. The three slow release N fertilizers were added once at growth start while urea was splitted into three equal batches at growth start and two month intervals. The merit was selecting the best source and rate of N for Zaghloul date palms. Fertilizing the palms with N as slow release N fertilizers generally was superior than the application of N via fast source (urea) in improving growth, yield and fruit quality. Using N at 250 g N/palm via sulphur coated urea, phosphorus-coated urea, and urea-formaldehyde, in descending order was very effective in enhancing all the investigated parameters. Increasing N levels from 250 to 1000 g N/palm applied via any slow release N fertilizers failed to show measurable increase on the studied parameters.Carrying out N fertilization via sulphur-coated urea at 250 g N/palm was necessary for promoting yield and fruit quality of Zaghloul date palms growing under Minia region conditions.

Effect of Using Slow Release N Fertilizers Versus Fast Ones on Fruiting of Zaghloul Date Palms