Advantages and disadvantages of farmyard manure and chemical fertilizer

Farmer's fertilizer: the advantages are more comprehensive nutrients, fertilizer effect is more moderate and long-lasting, the disadvantages are: (1) the composition is complex, the fertilizer effect changes, it is not easy to grasp the accurate amount of fertilizer; (2) decomposition is slow, fertilizer effect is late; (3) the amount of large (long 1kg of fish need 50-60kg of farmyard fertilizer) operation is heavy, and at the same time, increase the content of organic matter in the water body, even after the fermentation of the application will also be a large number of surface dregs with the quality of causing water pollution and easy to cause flooding and other phenomena; (4) oxygen consumption is large, it is calculated that decomposition of 1 ton of manure to consume 3.4-8 tons of oxygen equivalent to the pool. Cause water pollution and easy to cause flooding and other phenomena; (4) large oxygen consumption, it is calculated that decomposition of 1 ton of manure to consume 3.4-3.8 tons of oxygen, equivalent to 3.8 tons of carp in a growing season (about 180 days) of oxygen consumption.

2, chemical fertilizer: the advantages of decomposition is fast, fast fertilizer, fertilizer cycle is shorter (generally fertilization 2-3 days after the fertilization of the water quality becomes fat, water color is better) composition is more simple and easy to determine the amount of less (long 1kg of fish need 2-3kg of inorganic fertilizer) less intensity of the operation, the pollution of the water body is lighter, easy to transport and storage, and so on. The disadvantages are: (1) a single component, nutrition is not comprehensive, the need for several kinds of fertilizer with the use of organic fertilizers or with a mixture of fertilizers; (2) fertilizer fast, but the fertilizer does not last, an over-application of waste and pollution of water quality, but also prone to cause flooding of the ponds; (3) due to the inorganic fertilizer fertilizer is not persistent, can only be a small amount of times and look at the water to apply fertilizer method.