摘要
获得准确且稳定的SPAD值是使用叶绿素仪进行马铃薯氮素营养诊断的关键,而叶片SPAD值受多种因素影响,其中测定样本的大小直接影响植株SPAD平均值的稳定性。为了获得稳定且能准确反映马铃薯氮素营养状况的SPAD值,2011-2012年在内蒙古两地进行了田间试验,以确定适宜的测定样本数。结果表明,在充足供氮情况下,植株SPAD值变异较小;而氮素供应不足时,植株间SPAD值变异增加。根据两地试验结果,确定马铃薯氮素营养诊断的适宜样本数为30株。
The chlorophyll meter SPAD-502 is a promising tool to detect crop N status. The stable mean SPAD value is critical for the use of chlorophyll meter SPAD-502 in the potato N status diagnosis and N recommendation. To achieve this goal, field experiments were carried out on two sites in Inner Mongolia from 2011 to 2012 to test the difference among potato plants in terms of leaf SPAD value, determining proper sampling plants number so that getting stable SPAD index. The results showed that difference existed among potato plants in terms of leaf SPAD values, and the variation of SPAD readings among plants under sufficient soil N condition was less than that under insufficient N condition. Based on the results obtained in the research, it could be concluded that 30 plants is minimum sampling number for determining the SPAD value to evaluate plants N status.
出处
《作物杂志》
CAS
北大核心
2015年第4期135-137,共3页
Crops
基金
内蒙古自然科学基金(2013ZD04)
国家自然科学基金(31360502)
