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
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Effects of long-term nitrogen fertilization with different levels on sorghum grain yield, nitrogen use characteristics and soil nitrate distribution
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图2. 2018年和2019年高粱收获后0~200 cm土层土壤硝态氮 |
Fig. 2. Nitrate nitrogen in the 0-200 cm soil layer after sorghum harvest stage in 2018 and 2019 |
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