The Effects Of Rice Straw Nursery Pot On Soil Microecology

China is a big agricultural country producing a very rich straw resource every year. Reusing crop straw resource is a hot spot topic at present. Recently, one of the novel straw comprehensive reuse approaches is making straw seedling pot which is made of crop straw and supplemented by biological adhesives at home and abroad. The existing research results showed that the straw-made pots have good biodegradability, they can be quickly broken down by high temperature composting or buried in the soil. However, there are few reports about straw-made pot environmental compatibility in soil and its effects on soil and crop ecology. To investigate the straw-made pot nutrient release in the soil, the impact on soil microflora, the plant pathogen infecting seedling capacity and plant disease, a soil burial test for rice husk and straw-made pot by modified starch glue and modified bean glue was conducted. The key research results are as follows:Results showed that degradation and release of carbon, nitrogen and phosphorus were found in the process of rice straw-made pot buried in soil. In the first five days, mainly dissolved nutrients released fast. Nutrients released slowly and stably due to the degradation of nursery pots by microorganisms. After 65-d buried, the released rates of carbon, nitrogen, phosphorus and potassium in pots made of modified starch glue were 67.1%,68.0%,80.2% and 85.9%, while those in modified bean glue were 45.9%,55.5%,73.8% and 81.3%, respectively. The release rate was in the trend of K>P>N>C. The release rates of carbon, nitrogen and potassium were significantly (p < 0.01) correlated with the contents of total nitrogen and available potassium in soils; whereas there was no significant correlation ship with total and labile phosphorus. However, carbon release in nursery pot was not correlated with that in soils.Structure characteristics were analyzed on the buried straw-made pot modified by bean glue. The results showed that the cellulose, hemicellulose, lignin and ash content was respectively reduced by 11.19%,24.53%,7.15% and 31.01% compared with that before the soil buried. Infrared analysis showed that a strong degradation of cellulose, lignin and adhesive in straw-made pot modified by bean glue by microbes. Thermogravimetric analysis showed that the stability of the straw-made pot had partly improved after degradation. Generally, straw-made pot characterized good biological degradability and compatibility with the soil environment.At the end of the test, the soil urease and phosphatase activity increased. The two enzymes’activity in the rice-made pot by starch glue treatment was 1.17 times and 1.31 times of that by bean gum treatment. The microbial activity, microbial diversity index and uniform index of straw-made pot by bean glue in the residue after decomposition were higher than that by starch glue. The degradation of two types of straw-made pots could also improve the soil microbial activity.Based on results, the straw-made pot could promote the growth of plants. The straw-made pots buried in soil could be degradated and compatible with the environment.