关键词: 夏玉米, 尿素, 一次性施肥, 施肥深度, 氮肥利用率

Abstract: Effects of single application depth of nitrogen on summer maize yield, nitrogen accumulation and fertilizer use efficiency were studied in Taihe and Dongzhi counties of Anhui province, so as to probe the suitable depth for single fertilizer application in summer maize and to provide reference for precise single fertilization in mechanization of summer maize. Seven treatments of hole application were included in the present field experiment, CK, depth of 6 cm (D6), 9 cm (D9), 9 cm and 12 cm \[D(9+12)\], 12 cm (D12), 12 cm and 15 cm \[D(12+15)\], and 15 cm (D15). Except CK treatment, the doses of N, P2O5 and K2O were 180 kg/hm2, 135 kg/hm2 and 180 kg/hm2 in all fertilization treatments respectively. The results showed that in all treatments, maize yields in Taihe were 1.3~1.5 times of those in Dongzhi under the same fertilizer application. In both Taihe and Dongzhi experimental spots, maize yield of D12 urea application was increased than that of D6 and D15 treatments by 12.6% and 6.7%, respectively. The nitrogen accumulation in maize plant was the highest in D12 treatment, and in Dongzhi it was significantly higher than that of D6 and D15 treatments. The depth of urea application could significantly affect nitrogen use ratios in agronomy and apparent. The results in both Taihe and Dongzhi experimental spots indicated that the nitrogen apparent recovery in D12 treatment was increased than that of D6 and D15 treatments by 9.6% and 10.5%, respectively. The suitable depth for urea single application in Anhui province is about 12 cm in summer maize.

Key words: summer maize, urea, single application of fertilizer, application depth, nitrogen use efficiency