| 摘要 |
PROBLEM TO BE SOLVED: To obtain a quick-acting homogeneous porous fertilizer of low bulk density and high instantaneous solubility by including nitrogen ingredients and a specific amount of a potassium ingredient as fertilizer ingredients, with the nitrogen ingredients containing a nitrate-nitrogen ingredient at a specific level. SOLUTION: This porous compound fertilizer is such one as to essentially contain >=8 wt.% of a potassium ingredient and nitrogen ingredients and also contain <9 wt.% of a phosphate ingredient; wherein a nitrate-nitrogen ingredient accounts for >=5 wt.% of the total nitrogen ingredients, and it is preferable that the nitrogen, phosphate and potassium ingredients total >=30 wt.%. This fertilizer is obtained by spraying an acidic solution containing sulfuric acid, nitric acid or potassium nitrate, potassium sulfate, and as necessary, phosphoric acid into an ammonia gas flow. For applying this fertilizer to a paddy field, it is directly charged together with irrigation water via an inlet for the paddy field thereinto.
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