| Analysis of canopy light structure of maize with different planting density and soil water conditions |
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| DOI：10.7606/j.issn.1000-7601.2020.04.33 |
| Key Words: maize planting density water deficit canopy photosynthetically active radiation |
| Author Name | Affiliation | | MA Dongqing | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China | | TONG Ling | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China | | WU Xuanyi | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China | | LI Dezhi | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China | | YANG Shengju | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China | | WANG Lu | Center for Agricultural Water Research in China, China Agricultural University, Beijing100083, China
Wuwei Experimental Station for Efficient Water Use in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei, Gansu 733000, China |
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| Abstract: |
| The canopy light structure is related to crop photosynthetic production. To explore the effects of planting density and soil water condition on the canopy light structure of maize, the “Xianyu 335”, which is commonly planted in the Shiyang River Basin, was used for field trials. Two plant densities,70,000 and 100,000 plants·hm-2, were set with three water conditions,sufficient irrigation (W1)and slightly deficit irrigation(W2), and moderately deficit irrigation(W3). AccuPAR plant canopy analyzer was used to determine photosynthetically active radiation at different levels of canopy and the change of canopy light structure indicators during growth period were analyzed. The results showed that the light distribution in the lower canopy of field maize was better than in other locations, and the light structure index value was about 1.1 times of that of the upper canopy. On the whole, increasing the planting density （100 000 plants·hm-2） enhanced the ability of light interception, and the photosynthetic effective radiation interception (IPAR) was 34.02~39.38 MJ·m-2·d-1, photosynthetically active radiation interception rate increased by 0.40%~4.67% at the lower density condition from heading stage to filling stage. Increasing planting density （100 000 plants·hm-2) caused significant degradation of the light structure at the population scale and unbalanced attenuation of photosynthetic effective radiation in the canopy. The extinction coefficient (K) was 83% of that with the low density (70,000 plants·hm-2). At the jointing stage, the photosynthetic structure indicators were improved at low planting density. With the growth period, the photosynthetic radiation utilization efficiency of the lower canopy decreased by about 50% with the dense planting at the heading stage, especially, in dense planting (100,000 plants·hm-2), which was related to the senescence of the leaves of the maize from bottom to top and uneven attenuation in canopy. Under dense planting conditions, water deficit led to an average reduction of 3% in radiation utilization,and various light structure indicators of the canopy were greatly affected by the soil water conditions. Therefore, to improve the canopy light structure of field maize, it is very important to ensure adequate water supply in the middle and late growth stages under dense planting conditions. |
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