فهرست مطالب اعظم غلامزاده

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In all methods in which the evapotranspiration of plants is counted as a reference, in order to generalize the results to the vegetation, it is necessary to multiply the acquired amount to the crop coefficient. An experiment was done to estimate the crop coefficient amount of evening primrose that was repeated four times in a time period of 70 days on March 2018.[D1], in a weather station located in the agriculture college of Ferdowsi University of Mashhad. In this experiment, the plants were cultivated in white plastic pots (micro-lysimeter) by 50 centimetre height and 30 centimeter width. The demanded amount of water to provide the plants' water needs is considered based on the field capacity. By controlling the water balance in pots, the evapotranspiration of plants was measure and by the use of evaporation pan A data, the crop coefficient was calculated. According to the results of this study the crop coefficient of evening primrose in the initial, middle and final steps are 0.75, 1.05 and 1.00 respectfully. The average in whole the period evening primrose growth was 0.92. The total amount of evapotranspiration of plants was estimated to be about 377 millimeters.

Evening Primrose is one of the medicinal plants that have a high potential for Gamma linolenic acid production, which is essential as an intermediary in human body metabolism and Prostaglandins synthesis. In order to determine the effect of Salinity Stress and irrigation levels on morphologic and physiological characteristics of Evening Primrose, a pot experiment was conducted as a factorial based on completely randomized design with four replications in spring of 2018 at the Meteorological Station of Faculty of Agriculture, Ferdowsi University of Mashhad. The experimental factors consisted of irrigation treatments in 4 levels (100, 85, 70 and 55% Field Capacity) and salinity treatments at 3 levels (1.23, 4 and 8 ds/m). According on the results of this study, Evening Primrose plant could tolerate salinity and deficit irrigation stress before flowering at all levels. However, at flowering stage, it could not withstand the salinity levels at 4 and 8 ds/m and disappeared. Plant height, stem diameter and number of lateral branches in the interaction of stresses were less than Control treatment, while leaf length and width increased compared to control treatment. Simple irrigation effect was significant on electrolyte leakage in 0.01 level, chlorophyll b and Carotenoid in 0.05 level. deficit irrigation increased all physiological parameters compared to control treatment.