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Субтропическое и декоративное садоводство (75) 140 multifactor field experiment: the final stage of the investigations with fertilizers application (2005)(2006)(2007)(2008)(2009)(2010)(2011); later, after 7-8 years of experiment conservation and the non-use of fertilizers (2019)(2020). It is shown that nitrogen fertilizers (200-600 kg A.D./ha (with РК)) made tea yield on average 2.5-3 times higher than in the options without nitrogen. During the experiment conservation, the differences between the variants were leveled, and the yield was equally low on the entire experimental site. In the conditions of 2019, with untypically wet and cool summer period, it averaged 26 +3.2 c/ha, while in 2020, with a long summer drought it was 12 +2.4 c/ha, which turned out to be 2.2 and 3 times lower than in the fertilized plantation part in the experiment with minor-nutrient element (annual background N240P70K90). At the same time, the productivity potential of full-aged tea plantations (cv. Kolkhida), realized under optimal mineral nutrition and favorable weather conditions, was 5-10 times higher (100-120 c/ha).

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