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在设施菜地条件下,研究不同有机肥施用水平(0～60thm-2)对不同肥力土壤的硝态氮垂直运移的影响。结果表明,土壤硝态氮的垂直运移过程受有机肥施用水平和土壤肥力的影响,施肥量低于20thm-2时不同肥力土壤未出现硝态氮显著累积现象,当施肥量为60thm-2时土壤硝态氮累积峰值随土壤肥力水平的提高而增加;40～150cm土壤剖面中硝态氮累积总量随有机肥施用量的增加而增加;不同肥力土壤在相同有机肥施用水平下40～150cm土壤硝态氮累积总量的变化量不同,土壤肥力越高土壤硝态氮累积总量的绝对增加量越大,说明相同的有机肥处理对高肥力土壤硝态氮累积和淋洗的影响更大;不同肥力的土壤具有不同的有机肥适宜施用量。
The effects of different organic manure application levels (0 ~ 60thm-2) on nitrate accumulation vertical migration in different fertility soils were studied under vegetable field conditions. The results showed that the vertical transport of nitrate was affected by the application level of organic manure and the soil fertility. No significant accumulation of NO3 - N was observed in different fertility soils when the fertilization rate was lower than 20m-2. When the fertilization rate was 60thm-2 The peak value of nitrate accumulation in soil increased with the increase of soil fertility level. The total amount of nitrate accumulation in 40-150 cm soil profile increased with the increase of the application rate of organic manure. Under the same organic fertilizer application, The total amount of nitrate accumulation in 150 cm soil changed in different amount. The higher the soil fertility, the greater the absolute increase of total nitrate accumulation in soil, indicating the effect of the same organic fertilizer on nitrate accumulation and leaching in high-fertility soils Larger; different fertility of soil with different organic fertilizer suitable application rate.