| 摘要 |
<P>PROBLEM TO BE SOLVED: To develop a fertilizer having a fertilizer effect and fast-acting property equivalent to a chemical fertilizer using organic substances as raw materials in order to solve the problems that the concentration of nutrient elements is unstable in comparison with a commercially available culture soil using chemical fertilizers and a culture soil becomes in an oxygen deficient state, and thereby, it is difficult to get good seedlings, although a culture soil, in which bean-curd refuse compost or the like is blended, is used in the raising of seedlings for organically grown rice plant, because chemically synthesized materials are not permitted at all to be used at present over the entire period of crop cultivation in the Japan Agricultural Standard for organic agricultural products. <P>SOLUTION: Chicken droppings are roasted at a temperature not higher than 400°C, at which uric acid mainly occupying nitrogen contained in the droppings is decomposed, to make easily degradable substances in the droppings be hardly-degradable and to convert the droppings into a composite fertilizer containing nitrogen in the form of uric acid exhibiting a fast-acting property equal to a chemical fertilizer containing nitrogen, phosphoric acid, and potassium each in an amount of about 4%. When an easily degradable substance exists in a culture soil, in the raising of seedlings performed at about 30°C under a high-water-content condition, miscellaneous germs and molds propagate themselves and harmful reducing substances such as hydrogen sulfide, methane gas or the like are formed, and the production of healthy seedlings is inhibited. <P>COPYRIGHT: (C)2013,JPO&INPIT |
