BACKGROUND: This study was in order to verify the effects of providing organic amendment fertilizers from soil testing on cabbages, we provided different amounts of organic amendment fertilizers. The amount of organic amendment fertilizers was decided by applying the each inorganic rate to the amount of nitrogen, phosphorus and potassium of the organic amendment.
METHODS AND RESULTS: The cabbages subjected to treatments 1 and 2 showed similar or greater leaf colors (SPAD values), head heights, head widths, head weight, and soil organic matter content, nitrate nitrogen level, and conductivity after harvest when compared with cabbages treated with chemical fertilizers. The phosphorus and potassium fixation in the soil were higher in the plot where cabbages were treated with chemical fertilizers, and the nutrient use efficiency was greater in the plots with organic amendments and mineral addition.
CONCLUSION: The treatments 1 and 2 that used 180-200% of nitrogen, 100-130% of phosphorus and 185-250% of potassium in comparison to chemical fertilizers by applying the inorganic rates to the amount of nitrogen, phosphorus and potassium of the organic amendments, can be used as organic amendment fertilizers for cabbages.