Effects on micro-ecological characteristics in clayey soil of tobacco area under different sand adding proportions - Li Wenbin_, Northwest Agriculture and Forestry University, Yangling (China), College of Forestry; Li Xinping_, Northwest Agriculture and Forestry University, Yangling (China), College of Resources and Environment; Li Haiyang, Northwest Agriculture and Forestry University, Yangling (China), College of Resources and Environment (Xi bei nong lin ke ji da xue xue bao.Zi ran ke xue ban, 2012)
Keywords: ACTIVIDAD ENZIMATICA; ACTIVITE ENZYMATIQUE; ENZYME ACTIVITY; http://www.fao.org/aos/agrovoc#c_2604; http://www.fao.org/aos/agrovoc#c_7156; http://www.fao.org/aos/agrovoc#c_7796; SOIL; SOL; SUELO; TABAC; TABACO; TOBACCO