Study On Soil Suitability To Planting Tea In The Tea Region Of Mountain Meng

By means of field investigation, sampling and analysis in the lab, the relativity between soil characters and tea quality was studied. The soil suitability of this region was classified. The main results were as follows:1 Based on the analysis of correlation, partial correlation and multilinear regression, the relativity was studied between soil characters and tea quality in the tea region of Mountain M(?)ng. The results were as follows: soil bulk density, mechanical composition, the ration of three phases, organic matter, available nitrogen, available phosphorus, total potassium and available potassium were the main factors which affected and limit the quality of tea. The factors did on tea polyphenolsm, caffeine and catechins. The most important factors to tea polyphenolsm, caffeine and catechism were the organic matter of soil, available nitrogen and the organic matter respectively. The standardized coefficients were in turn -0.913, 1.255, 0.415.2 By means of correlation coefficient method, membership function, the soil suitability to planting tea in Mountain Meng was evaluated. The results were as follow: Soil bulk density, pH and the content of available potassium were the main factors affecting the integrated quality of tea. Compared with the standard of fine tea region brought forward by Tea research institute of Chinese academy of agriculture science, 46.5 percent of soil bulk density was slightly lower, and 58.2 percent of soil acidity was stronger, and 74.5 percent of the content of available potassium was seriously lack in the region. So they were main limited factors of this region for the good quality of tea.3 By system cluster analysis, the tea region of Mountain Meng was classified to four classes according to soil suitability to planting tea. The first class, such as the tea region Miaoxi of Lushan where the altitude was 1020-1460m high, was good at the soil physical and chemical characteristic, and rich of soil main nutrient. It should be pay more attention for its potential. The second class included the low-middle of Mountain Mengding, Maohe demonstration area and Zhongfeng demonstration area where the altitude was 608-1180m high. Its pH are stronger, and the content of organic matter, available nitrogen, available potassium were worse than the first one. The third class was above the middle of Mountain Mengding where the altitude was 1200-1450m high. The Soil bulk density was slightly lower, and the content of availablepotassium was seriously lack, and the pH of soil was stronger, which limited the rich organic matter and nitrogen. So its fertility was bad. The forth class was in Zhongfeng demonstration area, where the soil physical character was good, but the main nutrient was seriously absent.4 Compared with the first class, soil pH, available nitrogen and potassium were the slightly limited factors of the second class. In the third class tea garden, the soil bulk density, pH and the content of available potassium were the main limited factors. For the forth class tea garden, serious lacking of soil nutrient was the main limiting factor. The special climate and soil are the main reasons inducing these factors. So some measure should be taken, such as planting, covering and planting in the same level to prevent water and soil loss, and fertilizing in right variety and way.