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1,2(), 王劲松1, 董二伟1, 武爱莲1, 焦晓燕1,*()
Effects of long-term nitrogen fertilization with different levels on sorghum grain yield, nitrogen use characteristics and soil nitrate distribution
WANG Yuan1,2(), WANG Jin-Song1, DONG Er-Wei1, WU Ai-Lian1, JIAO Xiao-Yan1,*()

图2. 2018年和2019年高粱收获后0~200 cm土层土壤硝态氮
处理同表3

Fig. 2. Nitrate nitrogen in the 0-200 cm soil layer after sorghum harvest stage in 2018 and 2019
Treatments are the same as those given in Table 3.