Effect of New-type Humic Acid Urea on Yield, Nutrient Accumulation and Utilization of Corn

RAN Bin; ZHANG Aihua; ZHANG Qin; CHEN Zhenggang; WU Xinghong; WANG Peiguan; LI Kexian; GU Yingting; LIU Wenqi

doi:10.15933/j.cnki.1004-3268.2018.12.005

Abstract：Abstract:In order to find out the effects of humic acid urea with different humic acid content on maize yield, biomass, nutrient accumulation and utilization in mountainous areas of Guizhou province, and screen out a new type of humic acid urea suitable for maize production in mountainous areas of Guizhou province, field experiment was conducted using maize variety Xidusenyu No.1.Under the same total input of N, P2O5and K2O, the effects of applying 1‰, 2‰, 3‰, 4‰, 5‰, and 6‰humic acid urea(humic acid contents were 1‰, 2‰, 3‰, 4‰, 5‰, 6‰, respectively, N 46％) on maize yield, nutrient accumulation and utilization were analyzed with ordinary urea as control.The results showed that compared with ordina-ry urea treatment, except 6‰humic acid urea treatment, the other 5 humic acid urea treatments significantly increased maize yield, among which 2‰humic acid urea treatment had the highest yield of 11.24t/ha with the increase of 14.34％.The total dry weight of the above-ground parts of the plants treated with 6 kinds of humic acid urea increased significantly, and the highest was 371.33 g/plant treated by2‰humic acid urea.The accumulation of nitrogen was significantly increased after applying 1‰, 2‰, 4‰, and 6‰humic acid urea.The accumulation of phosphorus was significantly increased after applying1‰, 2‰, 3‰, 4‰and 5‰humic acid urea.Among them, the accumulation of nitrogen and phosphorus in plants treated with 2‰humic acid urea was the highest, which were 171.50 kg/ha and 122.95 kg/ha, respectively.2‰humic acid urea showed the highest nitrogen use efficiency, nitrogen absorption efficiency, partial nitrogen productivity and nitrogen agronomic efficiency, which were 27.20％, 95.28 kg/kg, 62.46 kg/kg, and 13.26 kg/kg, respectively.In summary, 2‰humic acid urea is optimal for maize production in Guizhou mountainous area.