Study On Soil Fertility Quality And Management Strategy Of Tea Garden In Changsha County

In order to find out the soil fertility quality of Changsha County Tea Garden and promote the development of tea industry,through field investigation,sampling and measurement,mathematical model,etc.the characteristics and distribution of soil pH,organic matter,alkali-hydrolyzed nitrogen,available phosphorus,slow-release Potassium and available potassium in Changsha County tea plantation soil were studied,the quality of tea garden soil fertility was evaluated by FUZZY comprehensive evaluation method,and the corresponding management countermeasures were put forward.The main results are as follows:(1)The average pH value of tea garden soil in Changsha County is 4.9,and it is weak acid soil,and the average contents of organic matter,alkali-hydrolyzable nitrogen and available phosphorus are 27.4g/kg,128.3mg/kg and 27.1mg/kg,respectively,which are in the second order(higher)level;The average content of slow-acting potassium was340.3mg/kg,which was in the fourth(lower)level,while the average content of quick-acting potassium was 108.9mg/kg,which was in the third(middle)level.(2)The soil pH value of the tea garden in qingqingpu town was the smallest,with an average value of 4.5,while that of chunhua town was the largest,with an average value of5.1.The soil organic matter content in the tea garden in chunhua town was the highest,with an average value of 29.7g/kg,while that in kaihui town was the lowest,with an average value of 19.0g/kg.The soil alkaline nitrogen content of the tea garden in chunhua town was the highest,with an average value of 137.1mg/kg,while that in huanghua town was the lowest,with an average value of 99.2mg/kg.The soil available p content in qingshan pu town was the highest,with an average value of 37.3mg/kg,while that in jinjing town was the lowest,with an average value of 20.6mg/kg.The soil slow-acting potassium content in huanghua town was the lowest,with an average value of 153.5mg/kg,while that in jinjing town was the lowest,with an average value of 90.6mg/kg.(3)The average pH value of tea garden soil in the upper part of Mountain Ridge is 4.5,the acid intensity is the strongest,the slope terrace and the hill gentle slope are the smallest,the average value is 4.7,the hill gentle slope tea garden soil organic matter content is the highest,the average value is 30.3g/kg,in the upper part of the Hill Ridge,the lowest value was 19.1g/kg,the highest was 139.7mg/kg,the lowest was 97.2mg/kg in the upper part of the hill ridge,and the highest was 30.1mg/kg in the lower hill,the content of slow-release potassium and available potassium in tea garden soil in the upper part of Mountain Ridge was the highest,the average value was 543.1mg/kg and 149.3mg/kg,respectively,the mean values were 176.1mg/kg and 81.1mg/kg,respectively.(4)Tultivated granite red soil had the highest acid intensity,with an average value of 4.6,and cultivated he-tidal soil the lowest,with an average value of 5.7.The organic matter content of the tillage quaternary laterite red soil was the highest,with an average value of30.8g/kg,while that of the tillage sandstone red soil was the highest,with an average value of 133.2mg/kg.The content of available phosphorus and available potassium in the cultivated plate shale red soil was the highest,with an average value of 53.8mg/kg and154.0mg/kg,respectively.The content of delayed potassium in the cultivated granite red soil was the highest,with an average value of 439.8mg/kg.The contents of organic matter,alkali-hydrolyzed nitrogen,available phosphorus,slow-acting potassium and quick-acting potassium in cultivated river tidal soil were the least.(5)The comprehensive index value of soil fertility quality of tea gardens in changsha county is 0.847,which belongs to the medium level.Among them,the comprehensive index values of soil fertility quality of tea gardens in chunhua town,jinjing town and kaihui town are 0.841,0.832 and 0.822,respectively,which are all of the medium level.The comprehensive index values of huanghua town and qingshanpu town are 0.634 and 0.739,respectively,which belong to the middle and lower level.(6)The soil fertility of tea garden can be improved by taking measures such as increasing organic fertilizer,adjusting soil acidity,managing water and improving soil ecological environment.