Preliminary Study On Characteristics Of Novel Macromolecular Slow-release Fertilizer

Generically, utilization ratio of Fertilizer is low, which restrict the development of agriculture of our country. And Slow-release Fertilizer will overcome the problem. This paper has been investigated the slow-release characteristics of macromolecular fertilizer that was synthesized by our research group (patent number: 200510063260) in detail. Especially, the way about studying the slow-release characteristics was established. At same time, the effects of soil on slow-release characteristics of macromolecular fertilize were furthered studied to realize the mechanism of slow-release. The main research works and conclusions were shown as follows:1. The methods about determining the N, P and K content of the macromolecular fertilizer were established.2. The effect of slow-release fertilizer on germination of wheat is slight, which is different from urea with same concentration of nitrogen. It restrains the germination of wheat. The result suggests that the slow-release fertilizer has better physicochemical property.3. Macromolecular fertilizer could degrade to form molecule that dissolve in water in soil solution for less than 120 days. In contrast, the fertilizer is bad solution and slowly degrades (40%) in de-ionized water at same days. Furthermore, the process of degradation is same to be in de-ionized water in the soil that is heated sterilization. The result shows that the animalcule plays the main role in the progress of degradation.4. The fertilizer has the similar process of degradation for being in soil and in solution containing soil, which shows the slow-release characteristics. The release of N, P and K is slow at first. And then the release is quick. The release mechanism is fit for the requirements of crops growth and is helpful to improve the utilization ratio of fertilizer.5. Furthermore the investigated results show that the pH of soil can keep being neutral in presence of the macromolecular fertilizer, which will efficiently avoid alkalization or acidification of soil. Compared with the pure soil, the quantity of bacteria, actinomycetes, and fungi in soil containing macromolecular fertilizer is more, suggesting that the macromolecular fertilizer could promote the growth of soil microbes.6. Compared with other fertilizers, the macromolecular fertilizer could keep the release of N, P and K for longer time about 60～100 days.