Abstract
Critical land area in Indonesia was recorded 23.25 million ha in 2000, and increased to 77.8 million ha in 2007, efforts are needed to optimize it. However, the existence of agricultural waste, livestock waste and sewage abundant fishery potential to increase soil fertility has not been utilized to the maximum. This study aimed to determine the macro nutrient content available in waste after the fermentation process. This research is an experimental research conducted in a laboratory to find out the content of: N, P, K, C / N ratio. The method for making liquid organic fertilizer is fermentation for one month using EM4 effective microorganisms, then analyzed using Spectrometry and Titrimetry Kjeldahl. The results showed that the highest N content was in bio urine fermentation (0.126%), fish waste (0.035%) and mixed waste (0.028%); The highest P was found in cattle rumen (7.239 mg / L), bio urine (5.234 mg / L), and seaweed (4.689 mg / L), and highest K was found in fruit waste (7, 801 mg / L). The highest C / N ratio was found in seaweed (55,643%) and fruit waste (27,857%). The conclusion is that agricultural waste, livestock waste, and fisheries waste after 1 month of fermentation contain adequate nutrients for optimizing critical land.
Highlights
Some institutions provide different definitions of degraded land
Complete organic matter content of the nutrients is a result of the fermentation of organic waste from agricultural waste, livestock waste, and fishery waste
2) The highest N content is in the results of bio urine fermentation (0.126%), fish waste (0.035%) and mixed waste (0.028%); the lowest N content was found in the results of the rumen fermentation of cattle, seaweed, and fruit waste respectively 0.014%
Summary
Some institutions provide different definitions of degraded land. Critical land is land that is not in accordance with the use and its ability to have experienced or in the process of physical, chemical, and biological damage which endangers the hydrological function, agricultural production, settlement and socio-economic life (Muljadi & Soepraptohardjo, 1975). Whereas the Ministry of Forestry defines critical land as land that is no longer able to function as a medium for regulating water management and good agricultural production elements, characterized by a state. The area of critical land in Bali reaches 44,669.78 ha, of which 16,323.68 ha is in the forest area and 28,346.10 ha is agricultural area. One strategy that can be implemented to optimize the potential of degraded land is to add adequate organic matter to the soil. Complete organic matter content of the nutrients is a result of the fermentation of organic waste from agricultural waste, livestock waste, and fishery waste. The presence of complete nutrient content and the indigenic microorganisms it contains when added to critical soils will be able to maintain soil fertility, increase soil microbial populations and preserve the environment
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