Effects Of Different Fertilizer Application On The Fertility Of Alkali Soil And The Proposed Minimum Data Sets For It

The experiment carried out in the Song Station Town, Zhaodong city, Heilongjiang province. The soil belongs to the aline-alkali soil. Within two-year experiments, we conducted soil's physical-chemical characteristics to compare the differences between five fertilizers (chemical fertilizer, manure, organic-chemical compound fertilizer, organic fertilizer and bio-fertilizer) in the test, and physical-chemical and biological characteristics were conduced to propose Minimum Data Sets (MDS). The part involved indicators for the fertility are organic matter, total N, available N, total P, available P, pH, available K. Excepting this, we also conduced the biological characteristics to set up MDS for evaluate the soil fertility quality. The principal component analysis (PCA) was used for MDS. The results are as follows:1. All tested fertilizers improved the soil chemical characters, including organic matter, total N, available K, total P, available P, pH, and the treatment 4 (manure) has the best function.2. Compared to the control, manure increased organic matter, total N, available nitrogen, total P, available P, and available K at the times of 1.47, 1.3, 1.28, 2.97, 3.24, and 1.62, respectively.The resules showed organinc matters has the best function to improve the aline-alkali soil.3. All tested fertilizers decreased the soil pH in the range of 0.2 to 0.4. These results showed the fertility can improve the characteristics of aline-alkali soil. Within the fertilizers, organic fertilizer has the best effectives.4. The tendency for available P and available K did not change followed the maize growth period for five fertilizers.The differences existed in the increasing tendency. The organic fertilizer had the advantages than other fertilizers.5. We proposed the MDS based on the two-year data, 2008 and 2009. There was little difference between the two MDS. Based on the data of 2008, we proposed organic matter, total N, available nitrogen, total P, and available K, and the cation exchange capacty as the MDS. The MDS of 2009 is organic matter, total N, total P, urease, water content, bacteria, fungus, and actinomycete. At last, organic matter, total N and total P composed the MDS.