Effects of Controlled-release Fulvic Acid Bulk Blending Fertilizer on Rice Growth and Soil Nutrients
In order to improve fertilizer efficiency and crop yield,fulvic acid was added to ordinary bulk blended fertilizer and controlled-release bulk blending fertilizer,and the effects of different fertilization treatments on soil nutrients and rice growth were studied through pot experiments.The results showed that the addition of calcium magnesium fulvate fertilizer to controlled-release bulk blending fertilizer could better promote nutrient absorption and increase the plant height of rice.The total amount of fulvic acid bulk blending(CFA1),the total amount of controlled-release fulvic acid bulk blending fertilizer(CRFA1),the nitrogen reduction of 20%of controlled-release fulvic acid bulk blending fertilizer(CRFA2),and the treatment of controlled-release bulk blending fertilizer+calcium magnesium fulvate fertilizer(CRFCa)significantly increased rice yield,and the yield increase rate was 10.2%～24.6%.The 20%reduction in the fulvic acid bulk blending fertilizer(CFA2)and the 20%reduction in the controlled-release bulk blending fertilizer(CRF2)did not increase the yield.There was no significant difference in the chlorophyll content of the rice leaves between the nitrogen fertilization treatments.Compared with the total amount of bulk blending fertilizer(CF1)treatment,the nitrogen fertilizer agronomic use efficiency increased by 1.7%～40.2%,and the nitrogen fertilizer contribution rate increased by 0.6%～14.5%.In general,the combined application of fulvic acid and controlled-release bulk blending fertilizer promoted rice growth,increased rice yield,increased nitrogen fertilizer agronomic use efficiency,and increased nitrogen fertilizer contribution rate.
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