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对湖南省３６个县（市）６７个茶场的１３６份茶园土样进行了肥力水平测定。结果表明：茶园土壤ｐＨ适宜，钾素较丰富。土壤有机质含量０～２０ｃｍ土层为（２．４±０．０９）％，２０～４０ｃｍ土层（１．６０±０．０６）％。８５％的土样０～２０ｃｍ土层有机质含量超过１．５％，３８％的土样超过２．５％；４９％的土样２０～４０ｃｍ土层的有机质含量超过１．５％。全氮含量０～２０ｃｍ土层为（０．１３３±０．００４）％，２０～４０ｃｍ土层为（０．１００±０．００３）％。碱解氮含量大于１００ｍｇ／ｋｇ土的土样占７６％，２０～４０ｃｍ占４５％。全磷含量低于０．１％的０～２０ｃｍ土层达５３％，２０～４０ｃｍ土层达６２％。速效磷含量低于１０ｍｇ／ｋｇ土的频率，两土层各为４６％和６５％，显示低磷土壤较多。代换性镁含量较低，茶园严重缺镁。依据调查结果，建立了茶园土壤主要养分与茶叶产量之间的数学模型，据此提出了茶园土壤养分的丰缺指标：产量在２２５０ｋｇ／ｈｍ２干茶的茶园土壤０～４０ｃｍ土层全磷（Ｐ２Ｏ５）含量＞０．１２％，碱解氮含量＞１４９ｍｇ／ｋｇ土，速效磷含量＞３２ｍｇ／ｋｇ土，速效钾含量＞１１０ｍｇ／ｋｇ土。通过试验，确定了４种主要土类适?
Soil fertility of 136 tea plantations in 67 tea farms in 36 counties in Hunan Province was tested. The results showed that: the soil pH of tea plantation is suitable and potassium is abundant. Soil organic matter content was (2.4 ± 0.09)% in 0-20 cm soil layer and (1.60 ± 0.06)% in 20-40 cm soil layer. The content of organic matter in 85% of 0 ~ 20cm soil layer exceeded 1.5% and 38% of soil samples exceeded 2.5%. The content of organic matter in 49% soil layer of 20 ~ 40cm soil layer exceeded 1.5%. The total nitrogen content of 0-20 cm soil layer was (0.133 ± 0.004)%, while that of 20-40 cm soil layer was (0.100 ± 0.003)%. Soil samples containing more than 100mg / kg of alkaline hydrolysis accounted for 76% of soil samples and 45% of 20-40cm samples. Soil layer 0 ~ 20cm with total P content less than 0.1% reaches 53% and soil layer with 20 ~ 40cm reaches 62%. The available phosphorus content was below the frequency of 10 mg / kg soil, with 46% and 65% in both soils, indicating that there was more phosphorus-poor soil. Replacement of lower magnesium content, a serious shortage of magnesium tea. According to the results of the investigation, a mathematical model was established between the main nutrients of tea garden soil and the yield of tea. Based on this, the index of abundance and deficiency of soil nutrients in tea plantation was put forward. The yield of total phosphorus (P2O5) in 0-40cm soil layer of tea plantation soil with 2250kg / hm2 dry tea ) Content> 0.12%, alkali hydrolysis nitrogen content> 149mg / kg soil, available phosphorus content> 32mg / kg soil, available potassium content> 110mg / kg soil. Through the test, to determine the four main soil suitable?