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运用盆栽试验方法，研究了不同光照条件下，莴笋生长期间三种紫色土中氮素含量的变化，结果表明：三种土壤中氮素含量的变化因处理光照的强弱而有所不同，光照增强时，土壤中ＮＨ４＋－Ｎ含量下降速度较快，光照较弱时则下降速度相对较慢；ＮＯ３－－Ｎ含量的变化亦因光照强度的不同而有差异，但其同时也决定于土壤中ＮＨ４＋－Ｎ的含量；三种紫色土相互比较，ＮＨ４＋－Ｎ和ＮＯ３－－Ｎ含量的变幅受光照强度影响的大小与土壤本身的肥力状况有关，其中肥力较低的石骨子土所受的影响相对较小，沙土所受的影响则稍大，肥力较高的大眼泥土所受的影响则最大；土壤中碱解氮含量的变化亦在一定程度上受土壤本身肥力状况的影响。
The pot experiment was conducted to study the changes of nitrogen contents in three purple soils under different light conditions. The results showed that the changes of nitrogen contents in three kinds of soils varied with the light intensity, The content of NH4 + -N decreased rapidly in soil and decreased slowly in low light. The change of NO3 - N content also differed due to light intensity, but it was also determined by soil NH4 + -N content. The three kinds of purple soil compared with each other, NH4 + -N and NO3 - N content amplitude by the light intensity of the impact of soil fertility conditions, including fertility of the lower part of the stone suffered The impact is relatively small, the impact of sand is slightly larger, and the soil with higher fertility is affected the most. The change of the content of alkaline nitrogen in soil is affected to some extent by the soil fertility.