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《Journal of Jilin Agricultural University》 2001-02
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Relationship between Leaf Area Index and Photosynthetic Rate of Maize Canopies

WANG Zhen, WU Zhi hai, XU Ke zhang (College of Agronomy, Jilin Agricultural University, Jilin Changchun 130118, China)  
Leaf area index (LAI) and net photosynthetic rate (Pn) of maize were measured with an infrared CO 2 analyzer in the lax type corn hybrid "Jidan 159", the mid type "Nongda 3138" and the compact type "Simi 25" to study the relationship between LAI and Pn. The results showed that the variations of LAI and Pn of the three varieties were a single peak curve through the whole growth stage at the optimum density with the maximum value at the filling stage. LAI and Pn of "Simi 25" are higher than that of other varieties during the growth stage. Pn of decreases with the increase of LAI. The decrease of Pn was less in "Simi 25" compared with that in "Jidan 159" and "Nongda 3138". Pn of the upper leaves were higher than that of middle leaves and the latter was higher than that of lower leaves. It could be concluded that the suitable LAI and Pn for high yield of maize was 4 5~4 6 and 36 0~39 0 μmol/(m 2·s), respectively
【Fund】: 吉林省科委资助项目 (吉科合字第 980 5 0 1)
【CateGory Index】: S513.01
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