Effect of Foliar Applied for Humic and Fulvic Acids as a Partial Substitute for Mineral Nitrogen on some Characteristics of Two Hybrids of Grain Sorghum

This study was carried out during 2019 and 2020 seasons at Arab El-Awamer Station, Assiut, Egypt to examine the effect of foliar application of humic and fulvic acids with 25 ml/L to improve soil properties with mineral nitrogen at 100% and 75% of the recommended dose on grain yield and its components. Humic and fulvic acids applied were individually or in combination of them at a ratio of 1:1 with N 75%. The obtained results showed that significant or highly significant effect between the genotypes for plant height and panicle length at two seasons . While the genotypes had a significant effect on grain ard / fed in the first season. The genotype hybrid Shandaweel-1 exhibited better results than the genotype hybrid -306 in most of the studied traits. Results of the present study also show that all the studied traits were significantly affected by the fertilization treatments. Among the fertilization treatments applied the treatment (N 75% + H + F) recorded the highest values for most of the studied parameters. The interaction between genotypes and treatments had a significant effect on the days to 50% flowering in the second season, while on 1000-kernel weight the interaction between genotypes and treatments had a significant effect in the first season. From the above results it could be recommended economically using of (N 75% + H + F), thus we could save 25 % of the recommended dose of N and improve soil properties.