摘要
在盆栽条件下研究了氮肥不同施用量及添加硝化抑制剂DCD对蕹菜生长、硝酸盐累积和土壤氮素形态的影响。结果表明,施氮0.00～0.30g/kg,蕹菜单株重和株高随施氮量增加而增加,但当施氮为0.40g/kg,蕹菜单株重和株高出现了下降趋势;随着施氮量的增加,蕹菜硝酸盐累积量增加;土壤硝态氮的累积量与施氮量成线性相关关系(关系式为y=45.7x+2.82,R2=0.9435);从整个蕹菜生长周期来看,0～20cm土体铵态氮含量呈现出波浪形变化,且整体显下降趋势。在施用等量氮肥情况下,添加10%DCD能显著提高蕹菜的单株重与株高,而且可抑制土壤铵态氮向硝态氮转化,使氮肥较长时间以铵态氮形式保留在土壤中,从而减少硝态氮累积。
A pot experiment was conducted to study the effects of different nitrogen levels and nitrification inhibitor DCD on the growth and nitrate accumulation of the water spinach and the content of nitrate in soil. The results indicated that, when the nitrogen level was between 0. 00～0.30 g/kg, the single plant weight and height of the spinach increased with the rates of nilrogen. But the single plant weight and height of the spinach decreased when the nitrogen level was higher than 0. 40 g/kg. Under different nitrogen levels, there was a quadratic equation relationship between rate of soil NO3- N content and nitrogen application rate （y = 45. 7x ＋ 2. 82,R2 = 0. 9435）, the nitrate accumulation of the spinach increased with the rates of nitrogen. The content of NH4^＋ -N within the depth 0～20 cm of soil decreased wavily in the growlh period of the water spinach. Under the conditions of all treatments with same nitrogen amount, the treatment of nitrification inhibitor DCD increased the single plant weight and height of the spinach significantly, inhibiting NH4^＋-N transformation to NO3 -N. So nitrogenous fertilizers retained in soil longer than other treatments, decreasing nitrate accumulation of soil and nitrogenous fertilizers leach loss.
出处
《北方园艺》
CAS
北大核心
2007年第12期10-13,共4页
Northern Horticulture
基金
福建省科技厅重大资助项目(2005S005)
关键词
施氮量
DCD
硝酸盐
硝态氮
铵态氮
Nitrogen application rate
DCD
Nitrate accumulation
The content soil NO3 - N
The content soil NH4^＋ - N
