upper layer of soil meaning in Chinese
上层土壤
Examples
- With the low irrigation water , the content of no3 - - n was lower in the upper layer of soil , and higher in deeper soil layers
土壤硝态氮的变化趋势为，灌溉施肥灌水量低时，上低下高；增加灌水量降低了土壤中硝态氮含量。 - The nh4 + - n accumulated in the upper layer of soil when the irrigation water was low ; and at the high irrigation rate , this accumulation was decreased
灌水量低时，滴灌施肥铵态氮在土壤上层明显累积；灌水量增加后，这种累积作用减弱。