عنوان مقاله [English]
Fertilizer management is one of the main factors in achieving sustainable agriculture. Therefore, the integrated agricultural system recommends the use of organic matter along with the optimal use of chemical fertilizers. This method is a balanced way to improve the physical and chemical properties of the soil, which leads to improved growth and increased plant yield. Organic fertilizers, especially livestock manures, have higher levels of organic matter than chemical fertilizers, and can be considered as sources of nutrients, especially nitrogen, phosphorus and potassium. One of the methods that increases the organic matter and increases the nutrients absorbed by the plant in the soil is organic fertilizers application. One of these organic fertilizers is poultry manure, which in addition to having macro and micro elements (manganese, iron, copper and boron) is one of the cheapest fertilizers compared to other fertilizers used. It is also richer in terms of nitrogen than other animal fertilizers. Environmental conditions and soil fertility are the factors that change the amount of active substances and essential oils, among which the role of trace elements in the soil is high. Numerous studies have shown the positive effect of the use of micronutrients in increasing the yield and quality attributes of agricultural products.
Micronutrients such as zinc, although needed in small amounts by plants, play an important role in plant growth and development.
Although plants need little zinc, if not enough of this element is available, plants will suffer from physiological stresses resulting from the inefficiency of multiple enzyme systems and other metabolic functions related to the zinc.
Zinc is one of the trace element that is effective in the synthesis of tryptophan, the precursor of auxin, increment the longevity of chlorophyll pigments and delaying leaf aging, carbohydrate metabolism and protein production in plants.
The application of zinc sulfate fertilizer improved the quantitative and qualitative attributes of basil, peppermint, sage and rosemary. Researchers stated that the application of a combination of chemical fertilizers and poultry manure has increased the yield of garlic essential oil. Therefore, in recent years, integrated plant nutrition management has been discussed. Integrated plant nutrition management is based on the simultaneous application of organic, chemical and biological fertilizers. Because organic fertilizers alone can’t provide the needs of high-yielding plants. Combined application of organic, chemical and biological fertilizers can improve the physical and chemical conditions of the soil and increase organic carbon and nutrients. Savory is an aromatic medicinal plant from the mint family. This plant has a lot of essential oils and is very important in the food, pharmaceutical and health industries. The aim of this study was to investigate the role of poultry manure and zinc sulfate in the cultivation of savory.
Materials and Methods:
The present experiment was performed as a factorial in a completely randomized design with 3 replications. The factors consisted of poultry manure with four levels (0, 3, 6 and 9 t.ha-1) and the second factor zinc sulfate with four levels (0, 50, 100 and 150 mg.kg-1 soil).
Results and Discussion:
According to the obtained results, the effect of poultry manure, zinc sulfate and their interaction on most of the studied traits was significant.
The highest height was observed in the treatment of poultry manure of 9 t.ha-1 + zinc sulfate in 100 mg. kg-1 soil, which showed an increase of 79.26% compared to the control, and the lowest height belonged to the control treatment.
Total chlorophyll in the treatment of poultry manure of 6 t.ha-1 + 150 mg.kg-1 increased by 57% compared to the control.
The highest amount of leaf nitrogen was obtained in the treatment of poultry manure of 9 t.ha-1 + 50 mg.kg-1 with an increase of 82.03% compared to the control. Zinc element was observed with a 222.75% increase in poultry manure treatment of 9 t.ha-1+ 150 mg.kg-1. Poultry manure treatment of 6 tons per hectare + 150 mg.kg-1 with 261.53% increase compared to the control contained the highest percentage of essential oil.
The results of the study showed that the use of combined ratios of poultry organic fertilizer and zinc sulfate has been effective in improving vegetative attributes, available plant elements and essential oil content.
Keywords: Essential oils, Medicinal Plants, Nutrition, Organic manure