ABSTRACT
Recent studies has proved an important influence for organic and inorganic fertilizers in medicinal plants growth and their effective compounds. All of that leads us to think more and more before using this nutrient resources, and to identify the best kind of fertilizers and the best application rates which produces best production [qualitative and quantitative]. The Main goal of this study is to evaluate the effect of some organic and inorganic fertilizers on some production parameters in spearmint plant [Mentha Viridis L.]. Where Different levels of [Cattle, Horse and Poultry] manures and Chemical fertilizers [NPK] were applied on Spearmint rhizomes which were grown in pots. During the study the following parameters were determined: Plant height, leaf area, leaf-to-stem fresh ratio and [fresh and dry] plant weight, oil percentage [% oil on fresh herb base] [, oil yield [ml/plant] and main components of oil. Results showed that significant increase in Plant height, leaf area and [fresh and dry] plant weight was happened in using Organic and NPK fertilizers comparing with control, in which superior effect was showed by Cattle manures [all treatment] and NPK [medium rate treatment]. Any clear effects were not showed in leaf-to-stem fresh ratio, except some. Organic and NPK fertilizers had clear and significant effect in increasing the oil percentage and oil yield in the most of treatments, and results showed also that chemical fertilizers significantly increased limonene percentage, and carvone percentage was increased in organic fertilizers