Foliar application of humic acid at different growth stages and their influenced on growth of bread wheat (triticum aestivum l.)‎

الملخص EN

Two field experiments were carried out at the research station of the college of Agriculture- Al-Qasim Green University located within the latitude 44 North and longitude 43Eº East during the two winter seasons 2017-2018 and 2018-2019.

The experiments were applied in the design of splits-plots in Randomized complete bloke design RCBD with three replicates, the concentrations of the humic acid were (0, 2, 4, and 6 g L-1) were applied in the main plots and spraying dates in sub plots to study the effect of spraying dates of organic bio fertilizer (humic acid) In some growth and dry matter properties of bread wheat.

The results showed that the concentration of 6 g L-1 produced the maximum height of the plant (94.64 and 97.28 cm) during both seasons, the leaf area of the flag (49.52 and 59.01 cm) during both seasons and the chlorophyll content (46.63 and 50.07 spad) during both seasons, Dry matter at the booting stage (6.08 and 6.24 ton.

ha-1) during both seasons, dry matter at flowering stage (9.93 ton.

ha-1) for the second season and dry matter at maturity of 15.60 and 16.62 ton.

ha-1) during both seasons.

The spraying dates booting (S2) gave the highest of the plant (90.47 and 93.57 cm) during both seasons, flag leaf area (49.79 cm2) for the first season, and the highest content of chlorophyll (44.50 and 48.01 spad) during both seasons, Dry matter at the stage of the booting (5.05 and 6.08 ton.

ha-1) during both seasons and the dry yield at the flowering stage (9.06 and 9.53 ton.

ha-1) during both seasons and the dry matter yield of phys-iological maturity (15.51 and 16.11 ton.

ha-1) during both seasons.

The highest response to growth traits was from the treatment of the reaction 6 gm.

L×S2 The highest height of the plant (98.43 and 100.33 cm) was given during both seasons, and the flag leaf area (52.13 cm) for the first season, the chlorophyll content (51.10 and 53.55 spad) during both seasons respectively, and the dry matter of booting (6.63 and 6.92 ton.

ha-1) during both seasons, and dry matter at flowering (9.83 and 10.60 ton.

ha-1) during both seasons and dry matter at maturity (16.01 and 17.26 ton.

ha-1) during both seasons.