Abstract
The study was conducted at the Crops Research Station, College of Agriculture, University of Diyala during the years 2017-2018 to evaluate the effect of planting dates and spraying of humic acid in the growth characteristics and active compounds of Fenugreek (Trigonella foenum –graecum L). The experiment was carried out according to factorial arrangement in a complete randomized blocks design (RCBD) with three replicates and two factors, the first include planting dates (15/10,1/11,15/11) and the second is spraying of the humic acid at a concentration of 2 and 4 ml / L−1. Results revealed that the planting dates had a significant effect in the studied traits, the first date (15/10) recorded the highest rate of plant height (84.89 cm), seeds yield (7.805 g / plant−1 ), seeds yield / hectare (770.2 kg / h−1), number of branches (9.67 branches / Plant−1), number of leaves (146.6 leaves / plant−1), dry plant weight (20.11 g/plant−1), number of pods (47.33 pods / plant−1), number of seeds (14.44 seeds / pod−1), weight of 100 seeds (1.502 g) and the active compounds such as Choline (170.99 mg/ml−1), Trigonelline (305.73 mg/ml−1), Carpine (95.89 mg/ml−1) and Gentianine (191.11 mg/ml−1). The spraying of humic acid at a concentration of 4 ml / L was superior significantly in all traits such as plant height (74.67 cm), seeds yield (7.220 g / plant−1), seeds yield / hectare (710.0 kg / h−1), number of branches (8.11 branches / plant−1), number of leaves (61.00 leaves / plant−1), dry plant weight (20.44 g/plant−1), number of pods (38.22 pods / plant−1), number of seeds (14.00 seeds / pod−1), Choline (163.61 mg/ml−1), Trigonelline (283.86 mg/ml−1), Carpine (83.92 mg/ml−1) and Gentianine (183.03 mg/ml−1).
