Document Type : Original Article
Authors
1
Plant production, Faculty of Agriculture, Technical and Vocational University, Tehran, Iran
2
Agricultural school of shahrekord
3
Faculty of agriculture, technical and vocational university tehran. iran
10.48301/kssa.2024.416267.2707
Abstract
In order to investigation of the effect of different levels of humic acid on some characteristics of the lallemantia plant under different water deficit treatments, a split plot field experiment was conducted in the form of a completely randomized block design in three replications in 2014. The treatments included four irrigation levels of 50, 70, 90, and 110 mm of evaporation from the surface of the evaporation pan, equivalent to no stress, mild stress, moderate stress, and severe stress respectively, as the main factor, and four levels of humic acid were zero, five, 10 and 15 liters per hectare as subfactors. The results illustrated that plant height, leaves number, secondary stems number, chlorophyll b, total chlorophyll, P concentration of aerial parts, RWC decreased under drought stress, and Na and K content of aerial parts and leaves proline increased. The use of humic acid increased the morpho-physiological indicators of the number of leaves per stem and the number of secondary stems. Also, the use of humic acid improved the relative water content of leaf, water use efficiency and proline content. The interaction effect of drought and humic acid treatments on N shoots and chlorophyll a was significant, And the highest amount of N was at the level of 15 liters per hectare of humic acid and 50 mm of evaporation. In general, the use of humic acid, especially in 15 liters per hectare concentration, improved the morphological and physiological indicators and greatly decreased the effects of drought stress.
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