.Mineral nutrition efficiency of controlledrelease fertilizers in net container seedlings of Larix kampferi Sarg.

One-year-old seedlings of Japanese larch cultivated in net containers were treated with different formulations of controlledrelease fertilizers. The aim of this study was to select a high mineral nutritionefficiency formulation of controlledrelease fertilizers under the condition of cultivation environment based on the growth characteristics of seedlings and the dynamics of mineral nutrition in seedlings and in the media. The selection of formulation was performed using fuzzy mathematics method. The results were as follows: The mineral nutrition availability of formulation 2 satisfied the growth requirements of larch seedlings and the pH of the substrate dropped into the most suitable value for this kind of seedlings.The seedlings treated with formulation 2 fertilizer displayed higher growth characteristics and mineral nutrition absorption efficiency according to the values of subject function compared with that of other fertilizers, including CK, which was expensively imported from the US. Therefore, formulation 2 should be popularized instead of CK because it brought about the seedlings’ highest growth indexes and nutrition uptake efficiencies. The use of formulation 2 would improve the quality of seedlings, make the process more efficient and reduce environmental pollution from toxic fertilizers.