Evaluation the effect of different doses of mineral fertilizers on the height growth of forest seedlings: A case study of Chatkal ridge

Abstract

This article describes the effects of different mineral fertilizer doses on the growth and development of seedlings of four forest-forming species grown with a closed root system on the western and southern slopes of the Chatkal ridge. The results show that different fertilizer doses have various effects on different types of seedlings. The effect of fertilizers on improving the growth of forest crops in the first year was not fully manifested, since growth buds were laid a year before fertilization against a natural background of growth conditions. Plants that had received more nutrients the year before grew the year ahead after fertilization, and a beneficial effect became apparent. The rate of fertilizer N90P90 K60 was more effective on pine growth on the western slope, while N120P180K60 showed high results on the southern. Oak on both slopes was better affected by a lower dose of fertilizer, hawthorn on both slopes by higher doses, and both doses had roughly the same effect on an apple tree. Therefore, for the apple trees, it can be recommended, as for oak, the depositing of a smaller dose due to the lower cost.