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1 生育期降水量(2015-2019)

Table 1 Monthly precipitation during five growing seasons from 2015 to 2019 (mm)

时期 Period 降水量Precipitation 2015 2016 2017 2018 2019 平均Average 5月May 32.0 20.2 15.0 48.6 0.6 27.8 6月June 15.5 61.9 70.8 54.3 45.8 52.3 7月July 74.4 256.6 143.1 143.5 45.6 119.1 8月August 67.6 137.5 124.2 77.2 48.8 83.2 9月September 68.1 19.8 3.4 56.8 73.4 69.3 生育期Total growth period 257.6 496.0 356.5 380.4 214.2 351.7