Preparation of potassium humate fertilizer from Camellia oleifera meal and its effect on plant growth
Camellia oleifera meal is a by-product of oil extraction from C.oleifera,and the comprehensive utilization level of C.oleifera meal has been low.In order to promote the resource treatment of C.oleifera meal and reduce the pollution caused by the stacking and burning of C.oleifera meal,in this study,C.oleifera meal powder was pyrolyzed by reactor water pyrolysis method,and the response surface simulation was used to optimize the pyrolysis conditions to produce C.oleifera meal potassium humate.Meanwhile,the effects of C.oleifera meal potassium humate fertilizer and mineral source potassium humate on the growth of Vigna radiata sprouts were compared and analyzed.The results showed that the optimal extraction parameters of potassium humate yield were as follows:reaction time 90 min,reaction temperature 180℃,KOH addition ratio 20%.Under these conditions,the highest yield of potassium humate in C.oleifera meal reached 60.1%.The effect of hydrothermal preparation of potassium humate fertilizer from C.oleifera meal on the growth of V.radiata sprouts was obviously better than that of potassium humate from mineral source and tap water.
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