Abstract:

Effects of combined application of N, P, K on the quantity of soil bacteria, actinomycetes, fungi, azotobacter, cellulose-decomposing bacteria, potassium bacteria, organic phosphate-dissolving bacteria and Inorganic phosphate-dissolving bacteria in Qiubei pepper field of Yunnan Province were studied by microbial cultivation in pepper’s bloom-growth, blossom and fruit period. The correlation analysis of quantity was carried out between different microorganisms. The results showed as follows: The quantity of this 8 group soil microorganisms in bloom-growth period, soil bacteria, azotobacter, potassium bacteria and organic phosphate-dissolving bacteri in blossom period, soil fungi, azotobacter and potassium bacteria in fruit period of Qiubei pepper were enhanced by combined application of N, P, K. The quantity of soil microorganisms was enhanced mostly when N︰P2O5︰K2O was 12︰10︰14. The correlations between different group microorganisms were strengthened by combined application of N, P, K. There was a very significant positive correlation between the quantity of azotobacter and cellulose-decomposing bacteria, negative correlation between azotobacter, cellulose-decomposing bacteria and potassium bacteria, positive or negative correlation between organic phosphate-dissolving bacteria and other physiological microorganisms.