Importance

Loading Importance Indicators...

Abstract

A liquid humic substance of the present invention is a liquid humic substance having, in separating the liquid humic substance into a precipitated part and a soluble part by regulating the liquid humic substance to have a pH of 1 by adding hydrochloric acid, a total organic carbon concentration A mg/L of the precipitated part and a total organic carbon concentration B mg/L of the soluble part that provide a value of B/A×100 of 15 to 100, and the production method thereof includes (1) a step of adding 80 to 160 parts by mass of nitric acid on anhydrous basis to 100 parts by mass of low rank coal, (2) a step of reacting a mixture obtained in the step (1) under condition of 70 to 95° C. for 2 to 6 hours, so as to prepare a crude humic substance, (3) a step of adding water and an alkali to the crude humic substance to regulate the crude humic substance to have a pH of 6 to 10, (4) a step of adding water to make a solid-liquid ratio of 1/3 or more, (5) a step of extracting under condition of a liquid temperature of 40 to 95° C. for 0.5 to 24 hours, and (6) a step of subjecting a humic substance extracted liquid obtained in the step (5) to solid-liquid separation, so as to provide the liquid humic substance. The present invention can provide a liquid humic substance that has a growth promotion effect on crop plants.

Loading the Abstract Image...

First Claim