In order to observe the effect of variable content of PMC in green house on the growth and yield of chinese cabbage. The soil of green house was collected, which had contained excessively accumulated salts by the repeated cultivation for over 10 years. In addition, the changing patterns of various inorganic salts were also investigated
1. The value of pH in the declared soil at initial state was in the range of 6.63∼6.55. However, in the soil treated with the poultry manure compost by the quantity of 8 Mg·10a-1, the value increased to the range of 7.10∼7.19 during development and growth period of chinese cabbage. In addition, the possibility of being injured by alkalic condition became high.
2. As for the value of EC(electro-conductivity), the value was in the range of 2.45∼2.46 when no fertilizer had been used. However, in the soil regulated by poultry manure compost with the maximal quantity of 8 Mg·10a-1, the value increased to the range of 4.10∼4.15 ds/m during the development and growth period of chinese cabbage. This value was higher by about double compared to the value of 2.00 ds/m, which is a concern level by excessive salts.
3. As for inorganic phosphoric acid, the phosphoric acid content in Saloid-P, Al-P, Fe-P tended to reduce when the applied content of poultry manure compost increased. The amount of phosphoric acid in Ca-P was increased slightly by the influence of pH.
4. The available phosphorus content was significantly recognized in order of Ca-P>, Fe-P > Al-P > Saloid-P.
5. In the soil treated with the poultry manure compost, the exchangeable cation content increased compared to the control group treated with no fertilizer or with compound fertilizer. Especially, the exchangeable calcium ion content was confirmed to have increased.
6. Owing to increase in the treatment with higher amount of poultry manure compost, the progression of nitrification in the experiment soil was a little delayed compared to the control group treated with fertilizer or with compound fertilizer.
7. The reducing sugar content in chinese cabbage, treated with the poultry manure compost, was found to be closely related with the absorption of soluble boron.
8. The yield and growth of chinese cabbage showed a tendency of being reduced slightly in the test group treated with poultry manure compost of 8 Mg·10a-1.