Traditional Culture Encyclopedia - Traditional customs - What are the disadvantages of using grass ash alone for glazing? How to overcome?
What are the disadvantages of using grass ash alone for glazing? How to overcome?
(1) Unstable chemical composition;?
(2) the range of melting temperature is too narrow and difficult to control;?
(3) There is serious glaze shrinkage;
(4) The source is limited and not suitable for mass production.
In order to overcome these shortcomings, potters after the Shang Dynasty dispensed clay into grass ash or fired grass ash and limestone together to form ash, and then added an appropriate amount of clay, which overcame the various shortcomings mentioned above. This glaze-making method was later commonly adopted by successive kilns.
extended informationThe grass ash is light and alkaline, dry and easy to go with the wind, wet and easy to go with the water, and nitrogen fertilizer is easy to cause nitrogen volatilization loss. Therefore, to take the following methods to accumulate grass ash:
1, warehouse storage conditions of farmers, to build a permanent grass ash warehouse, every day the ash poured into the warehouse, in order to accumulate. The ash bin should have a rain shelter, the ground should be high (to avoid water accumulation), hardened, and moisture-proof.
2, bagged with conditions, to grass ash in time with plastic bags sealed and stored.
3, single storage to strictly avoid mixing and stacking with other agricultural fertilizers. Some farmers are accustomed to grass ash poured into the puddle with organic fertilizers, straw and other mixed composting, there are grass ash pad toilet or with human waste, stable fertilizer mixed pile. This is very wrong. Because of the grass ash is alkaline, the results of the above practices will cause the volatilization of nitrogen in organic fertilizer, reducing the effectiveness of fertilizer. This treatment of grass ash, not only will cause waste of fertilizer, but also cause pollution of the environment.
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