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As in the comparison of the common market fertilizers and manure to ensure the plant is always in good and stable high yield, the type of fertilizer or inorganic fertilizer cycle required several times a year (in particular the study on time of 6 months). In fact the substances in inorganic and part of chemical fertilizers will be partly consumed crops, partly self-loss, in part, to accumulate or be washed. This led to the "habits of farmers who feared the lack of fertilizer and inorganic chemical fertilizers will increase the fault condition of balance in the land" as arable land currently in Viet Name being in the status infected alum, salt contamination, erosion, silver colored, arid, and has had some poor soil cultivation region (land of death) and cannot renovate anymore
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