摘要
通过盆栽试验,设计3个氮素配比：N1（所施氮素全部为NO3--N）,N2（NO3--N∶NH4＋-N=7∶3）,N3（NO3--N∶NH4＋-N=5∶5）和3个土壤水分处理：W1（田间持水量的75%~85%）、W2（田间持水量的65%~75%）、W3（田间持水量的55%~65%）,研究不同水分条件下不同形态氮素配比对茼蒿株高、产量、全氮含量、叶绿素含量以及硝酸还原酶活性的影响。结果表明,同一形态氮素配比条件下,土壤水分含量的提高可以显著增加茼蒿株高,但茼蒿的产量、氮含量、叶绿素含量和硝酸还原酶活性均随水分的增高呈先增高后降低;N2和N3处理时,W2处理的茼蒿叶绿素、全N含量和硝酸还原酶活性均显著高于W1和W3处理;同一水分条件下,提高NH4＋-N比例均能显著提高茼蒿株高、产量、叶绿素含量和全N含量,但茼蒿硝酸还原酶活性随着NH4＋-N比例的增加呈先升高后降低。综合认为,最优的土壤水分和氮素组合为W2N3。
The effect of nitrogen form ratios on the growing of C. coronarium L. under different soil moisture condition was studied.Three types of nitrogen form ratios were： N1（NO3--N）, N2（NO3--N∶NH4＋-N=7∶3）, N3（NO3--N∶NH4＋-N=5∶5）and three levels of soil moisture were： W1（75%-85% of the field capacity）, W2（65%-75% of the field capacity）, W3（55%-65% of the field capacity）.The results showed that the height of C. coronarium L. increased with higher soil moisture condition, whereas the yield, the content of chlorophyll and total nitrogen, and the nitrate reductase activity of C. coronarium L. all first increased and then decreased with increasing soil moisture condition. N2 and N3 treatment, the content of chlorophyll, total nitrogen, and the nitrate reductase activity of C. coronarium L. under W2 were significantly higher than under W1 and W3. When under the same soil moisture condition, higher proportion of NH4＋-N always enhanced the height, yield, the content of chlorophyll and total nitrogen of C. Coronarium L. However, the nitrate reductase activity of C. coronarium L. first increased and then decreased with increasing proportion of NH4＋-N. In conclusion, the best water-nitrogen combination was W2N3（65%-75% of the field capacity and NO3--N∶NH4＋-N=5∶5）.
出处
《山西农业科学》
2014年第12期1289-1293,共5页
Journal of Shanxi Agricultural Sciences
基金
山西省农业科学院攻关项目(2012ygg19)
关键词
土壤水分
氮素配比
茼蒿
soil moisture
nitrogen form ratios
C.coronarium L.
