Establishing dynamic thresholds for potato nitrogen status diagnosis with the SPAD chlorophyll meter

ZHENG Hong-li; LIU Yan-chun; QIN Yong-lin; CHEN Yang; FAN Ming-shou

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Establishing dynamic thresholds for potato nitrogen status diagnosis with the SPAD chlorophyll meter

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The hand-held soil plant analysis development (SPAD) chlorophyl meter has proved to be a promising tool in evaluating the nitrogen status of the potato and guiding fertilization recommendations. In the process of N evaluation of potato plants and N recommendation, it is critical to establish the threshold SPAD value (SPAD reading), below which nitrogen supplement is required. And taking convenient using into account, the threshold needs to be dynamic throughout the potato growing season so that the users can test their potato plants and make fertilization decision at any growing time of potato. To complete this goal, ifeld experiments with different nitrogen supply levels were conducted in different sites in northern China from 2009 to 2011. The results showed that threshold SPAD values decrease as the growing season progresses for al cultivars and planting sites. By statistical analysis, the threshold regression models were established respectively as:y=−0.003x2−0.0507x+58.213 (y, threshold SPAD value;x, days after emergence) for the potato cultivar Kexin 1, and y=−0.003x2+0.017x+52.489 (y, threshold SPAD value;x, days after emergence) for the cultivar Shepody, from which, the threshold SPAD value at any day after emergence can be calculated.

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《农业科学学报（英文版）》 |2015年第1期|190-195|共6页
作者
ZHENG Hong-li; LIU Yan-chun; QIN Yong-lin; CHEN Yang; FAN Ming-shou;
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Colege of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, P.R.China;

Center of Biotechnology, Chifeng Academy of Agricultural and Animal Husbandry Sciences, Chifeng 024031, P.R.China;

Colege of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, P.R.China;

Colege of Ecology and Environment Science, Inner Mongolia Agricultural University, Hohhot 010019, P.R.China;

Colege of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, P.R.China;

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Establishing dynamic thresholds for potato nitrogen status diagnosis with the SPAD chlorophyll meter

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