Studies on increasing N utilizing efficiency in maize by applying humic acid

Effects of applying urea mixed with humic acid on nutrient absorption, yield and N utilizing rate in maize were studied. The results indicate that the humic acid can obviously promote the absorption of nitrogen, phosphorus and potassium by maize plants with an obvious increase of the contents of nitrogen and potassium oxide in the stem and leaves of maize plants. Humic acid added in urea can evidently increase grain yield and N utilizing rate of maize. According to the yield and N utilizing rate of maize, 10% humic acid added in urea is better than other treatments in comprehensive effects.