| Regulation of photosynthesis and transpiration of summer maize under different nitrogen treatments |
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| DOI：10.7606/j.issn.1000-7601.2018.05.16 |
| Key Words: mulch drip irrigation maize photosynthesis transpiration |
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| Abstract: |
| Experiments were conducted in fruit experimental of Aksu prefecture of Xinjiang in 2016. Three nitrogen fertilizer treatments,503.88 (N1), 413.4 (N2) and 322.92 kg·hm-2 (N3) respectively were set up to analyze the diurnal variation of control factors of photosynthesis and transpiration and the coupling relationship between photosynthesis and transpiration during the grain filling stage of summer maize. The results showed that: (1) Photosynthesis rate(A), transpiration rate(E), photosynthetic active radiation(PAR), leaf temperature(T) and stomatal conductance(Gs) demonstrated a similar trend from 9∶00 to 19∶00, and ordered as N2>N3>N1. (2) A correlated positively to E with significant linear relation. (3) For photosynthesis, the response of factors to nitrogen application rate was Gs and PAR>Ci>T. For transpiration, the response of various factors to nitrogen application rate was Gs>PAR>T and Ci. (4) During daily variance，A,E and PAR, T, Gs showed a similar trend , this lead to the similar linear correlations of A-PAR and E-PAR, A-T and E-T, A-Gs and E-Gs. Therefore, applying with 241.5-297.18 kg·hm-2 during flare opening stage and 171.9-206.7 kg·hm-2 during silking stage could keep the photosynthetic intensity on a high level. |
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