长期施用不同剂量氮肥对高粱产量、氮素利用特性和土壤硝态氮含量的影响

王媛, 王劲松, 董二伟, 武爱莲, 焦晓燕

Effects of long-term nitrogen fertilization with different levels on sorghum grain yield, nitrogen use characteristics and soil nitrate distribution

WANG Yuan, WANG Jin-Song, DONG Er-Wei, WU Ai-Lian, JIAO Xiao-Yan

表4 不同氮素用量下高粱5年累积氮肥利用特性

Table 4 Nitrogen utilization characteristics which were accumulated for five years at different nitrogen application rates

处理 Treatment 氮肥施入量 N fertilization (kg hm-2) 氮素积累 N accumulation (kg hm-2) 氮肥利用率 NFUE (%) 氮肥农学效率 NAE (kg kg-1) 氮素表观回收率 NARR (%) N0 0 587.45 a — — — N75 375 823.72 b 63.01 d 14.19 d 219.66 e N150 750 854.60 bc 35.62 c 6.63 c 113.95 d N225 1125 840.24 bc 22.47 b 3.94 b 74.69 c N300 1500 883.90 cd 19.76 ab 2.68 ab 58.92 b N450 2250 912.18 d 14.43 a 1.57 a 40.54 a