| Cite this article: | 周青云,李梦初,漆栋良.拔节期淹水条件下施氮量对春玉米生理特性和产量的影响[J].灌溉排水学报,,():-. |
| Zhou Qingyun,Li Mengchu,Qi Dongliang.拔节期淹水条件下施氮量对春玉米生理特性和产量的影响[J].灌溉排水学报,,():-. |
|
| |
|
|
| This article has been：Browse 1751Times Download 0Times |
|
|
|
| DOI： |
|
| Effects of nitrogen rate on physiological characteristics and grain yield of spring maize under waterlogging at jointing stage |
|
Zhou Qingyun, Li Mengchu, Qi Dongliang
|
|
Yangtze University
|
| Abstract: |
| 【Objective】 Nitrogen (N) fertilizer supply and use play a vital role in determining crop growth and yield, even under waterlogging. However, the effects of N supply levels on plant growth under waterlogging conditions remain elusive. Thus, we investigated the effect of N fertilizer rates on physiological characteristics and grain yield of maize under waterlogging at the sixth-leaf (V6) stage. 【Method】 A field experiment was conducted at Jingzhou, Hubei Province of central China in 2018, where crop growth and development are susceptible to waterlogging or flooding stress due to frequent and heavy rainfall during crop growing season. Using maize (Zea mays L.) with variety of ‘Yidan 629’ as target experimental plant. A split-plot experiment was designed; the main plot was water regime, which included well-water supply through the whole growth stage of maize (WW) and waterlogging for 6 days with 3-5 cm layer of water at the surface of soil at the V6 stage of maize (WL). The subplot was N rate, which included 0, 90, 180, 270, and 360 kg/hm2, designated N0, N1, N2, N3 and N4, respectively. Leaf SPAD values during the V6 to milking (R4) stages, superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities and malondialdehyde (MDA) content in leaves, net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) at the end and after of the WL, grain yield at the maturity (R6) stage were determined. 【Result】The results showed that, compared to the WW, the WL significantly reduced the chlorophyll SPAD value, SOD, POD and catalase CAT activities, Pn, Tr and Gs in leaves at 0, 15 and 35 d after waterlogging treatment and grain yield in each N rate. With the increase in N rate, the SOD, POD and catalase CAT activities, Pn, Tr and Gs significantly increased up to N3 and then obviously decreased at N4 under the WW (excluded SPAD values) and significantly increased up to N4 under WL. Compared to the other N treatments, N4 resulted in a greater SOD, POD and activities, Pn, Tr and Gs and thereby produce a higher grain yield under the WL. The enhanced SOD, POD and activities, Pn, Tr and Gs could be related to high soil available N content at a high N rate (N4). However, the MDA content decreased with the increase in N rate under the WL. The MDA content decreased with the increase in N application rate up to N3 then increased at the N4 under the WW. Under the WW, grain yield in N1, N2, N3, and N4 was 8.63%, 23.91%, 42.92% and 29.95% greater compared to N0, respectively. The corresponding values under WL treatment were 20.21%, 31.86%, 52.55% and 57.03%, respectively.【Conclusion】Thus, proper added application of nitrogen fertilizer (360 kg N/hm2) favor to improve the physiological characteristics, resulting in a high grain yield of maize under waterlogging at the V6 stage in the studied area. These results should provide some scientific basis on nitrogen management for maize in the Jianghan Plain of China and other regions with similar environments. |
| Key words: nitrogen rate; waterlogging at the V6; antioxidant enzyme activities; photosynthesis; grain yield; maize |
|
|
|
|
|
|
