Nutrient Contents and Productivity of Triticum aestivum Plants Grown in Clay Loam Soil Depending on Humic Substances and Varieties and Their Interactions

Due to an extreme increase in population growth, Egypt suffers from a widening gap the quantity of imported wheat compared with production and local consumption. Two field trials were conducted during 2018/2019 2019/2020 seasons three levels humic substances (HSs) as foliar spray (1.0, 2.0 4.0 g L?1; HS1, HS2 HS3) (5.04, 7.56 10.08 kg ha?1; HS4, HS5 HS6) soil application. These applied times (30, 45 60 days after sowing) comparison control (HS0) evaluate performance varieties (Seds1 (V1), Misr2 (V2) Giza168 (V3)) grown clay loam soil. The experiment was set up according split-plot structure randomized complete block design; however, main plot treatments sub-main plot. Generally, data indicated that application recorded maximum values for most growth yield attributes, except spike length grain weight per spike, SPAD reading total first season, leaf area biological second season. HS2, HS5, HS6 superior nutrient contents studied. Regarding influence variety, results showed V3 LA, SpL, TGW, TGY Zn Cu both seasons; PH, GWS N content season; reading, BY K, Fe Mn V1 variety GWS, BY, K season GNS followed by V2, which had greatest P seasons,