[Effects of fertilizer of calcium silicon magnesium potassium on the dynamics of soil acidity and exchangeable base cation in paddy field of southern China].

Soil acidification of large areas of paddy fields in southern China has become an important problem in rice production. Therefore, how to ameliorate or remedy the acidifying paddy soil and to exposit its mechanism has important theoretical and practical significance for rebuilding healthy soils and guaranteeing national food security. Although lime has already been extensively used to remedy acidified soils, long-term application of a large amount of lime would not only cause the soil to harden, but also disturb the balance between calcium, potassium and magnesium in the soil.

[Isolation of endophytic fungi from Zanthoxylum simulans and screening of its active strain].

This study aims at making full use of microbial resources, and screening the active endophytic fungi of anti-rheumatoid arthritis from Zanthoxylum simulans. The endophytic fungi were cultured and isolated by tissue culture and scribing method, and the active strain of inhibiting the proliferation of human rheumatoid arthritis synovial fibroblasts (HFLS-RA) was screened by MTT method. Morphological characteristics and rDNA ITS1-5.