Studies on the Regional Difference in Organic Matter of Tobacco Soils and Their’ Are Fertility in Hunan Province
|School||Hunan Agricultural University|
|Keywords||Hunan Flue-cured tobacco Organic matter Regional differences Active organic carbon|
Hunan tobacco soil organic matter regional differences , but in the production of soil organic matter content did not affect the growth of tobacco proven reasons , the study compare and filter out based on the determination of the active soil organic matter , analysis Hunan tobacco soil organic matter, total and labile organic matter of regional differences , and the correlation between the two analyzes . On this basis , the fertility status of the major tobacco-growing areas in Hunan Province . The main findings are as follows : 1 by a simple comparison of different testing methods for active organic carbon , different conditions on the determination method analysis of potassium permanganate oxidation of 1 hour oscillation screened as active organic carbon determination method , this method is fast convenient, accurate and reliable results . 2 Hunan tobacco-growing areas of soil organic matter content in the range of 17.22 ~ 53.31 g ╱ kg , with an average content of 33.81 g / kg, Shonan ( an average of 43.12 g ╱ kg ) > the Xiang ( average 31.19 g ╱ kg ) > xiangdong (30.76 g ╱ kg)> Xiangxi ( average 23.48 g ╱ kg), the total different tobacco-growing areas of organic matter are significant differences , Shonan and Xiangxi there was significant difference ; organic matter content level from west to south gradually increased . Of active soil organic carbon content between 2.60 ~ 5.92g ╱ kg , the average content of 4.17 g ╱ kg Shonan ( an average of 4.64 g ╱ kg ) > the eastern Hunan (3.73 g ╱ kg ) > Xiangxi ( an average of 3.55 g / kg ) the > central Hunan ( an average of 3.21 g ╱ kg), regional differences are not significant , active organic carbon occupies a total organic carbon proportion very different . 3 active organic carbon , total organic carbon reaches a significant level . The total level of soil organic carbon is not a complete response to the size of the impact and contribution of soil organic matter on soil nutrient , soil active organic carbon is an important factor affecting growth of tobacco . The province's tobacco-growing areas of soil available N, P, K content and Mg , Zn , Mn and other nutrient elements above the middle level , the effective B at a very low level , 96% of soil missing B . Quite different soil nutrient content and distribution of tobacco planting area , south of Hunan province soil N , P , Zn content , but the K , the Mn content is low ; the Xiangxi smoke area soil available N, P content is lower , effective K , Mn -rich ; the Xiangdong smoke District soil severe magnesium deficiency .