|
[9004142.] رقم البحث : 9004142 - |
|
Effect of Humic Acid Foliar Application on Quantitative and Qualitative Yield of Caraway (Carum carvi L.) Plant / |
| |
قطاع الدراسات الزراعية / General |
| تخصص البحث : General |
| |
Assiut Journal of Agricultural Sciences / / Vol. 51, no. 2 - July 2020 |
| |
يوسف خيرى انور ( ajas@aun.edu.eg - 01226313930 ) - مؤلف رئيسي |
| |
Caraway, humic acid, vegetative growth, seed yield, essential oil. |
| |
A field trial was carried out during 2018/2019 and 2019/2020 seasons at the Experimental Farm of Faculty of Agriculture, Assiut University to study the effect of foliar humic acid application at the concentrations of 0 (control), 200 and 400 ppm three times, monthly interval on growth, fruit yield, and essential oil yield and its composition of caraway (Carum carvi L.) plant.
The results indicated that humic acid treatments improved the vegetative growth characteristics (plant height, branch number per plant and plant dry weight), fruit measurements (umbel number, 1000-seed weight and seed yield) and essential oil parameters (oil percentage, oil yield and oil constituents) in comparison with control plant (without humic acid). However, a rate of 400 ppm was more effective than the level of 200 ppm in this regard.
Seeds of plants received 400 ppm showed the highest contents of total proein, total carbohydrates, total phenolics, ascorbic acid (vitamin C) and thiamine (vitamin B1). In contrast, these seeds contained the lowest levels of nitrate and nitrite. These findings were closely correlated with increasing 1000-seed weight showing better quality.
Chemical analysis of caraway leaves cleared that the maximum contents of nitrogen, phosphorus, potassium, and pigment were occurred by humic acid at 400 ppm resulting in significant increases compared to 200 ppm level in most cases. It was found a positive relationship between the highest contents of leaf N, P and K and the improvement of vegetative growth and fruit characteristics, consequently increase of seed production.
The gas liquid chromatography (GLC) analysis of the essential oil showed the presence of two main components, carvone and limonene. The highest carvone (40.58%) and the lowest limonene (13.51%) were obtained by humic acid at 400 ppm, meanwhile the control showed the reverse trend; the lowest carvone (18.86%) and the highest limonene (23.60%). The level of 200 ppm showed intermediate contents. The quality of caraway seeds is considered to correlate with carvone/limonene ratio; the higher ratio expressed as better-quality. Accordingly, the best treatment achieved the highest ratio (3.0). It was observed a direct relationship among the increases of seed yield, essential oil and their qualities. |
| |
 Download Paper |
تسجيل دخول 
