| Cite this article: | 杨梅霞,于守超,周晨莉,等.绿洲色素万寿菊光合生理特性及产量对水氮调控的响应[J].灌溉排水学报,0,():-. |
| Yang Meixia,Yu Shouchao,Zhou Chenli,et al.绿洲色素万寿菊光合生理特性及产量对水氮调控的响应[J].灌溉排水学报,0,():-. |
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| Effects of Water and Nitrogen Regulation on Photosynthetic Physiological Characteristics and Yield of Pigmented Marigolds |
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Yang Meixia1, Yu Shouchao2, Zhou Chenli2, Zhang Hengjia2
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1.Gansu Agricultural University;2.Liaocheng University
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| Abstract: |
| 【Objective】In order to investigate the effects of different water and nitrogen regulation on photosynthetic characteristics and yield of pigmented marigold under drip irrigation in oasis, a field experiment on water and nitrogen regulation of pigmented marigold under drip irrigation was carried out at Yimin Irrigation Experimental Station, Minle County, Gansu Province, China, from May to September 2024, in order to investigate the effects of different water and nitrogen regulation on photosynthetic characteristics and yield of pigmented marigold under drip irrigation in oasis. 【Method】 Moderate water deficit (W1, 55%-65% of field holding capacity [FC]), mild water deficit (W2, 65%-75% FC), and full irrigation (W3, 75%-85% FC) were set up at the seedling stage, bud stage, early flowering stage, and full flowering stage, respectively. Four N application levels were set: low N (N1, 120 kg/hm2), medium N (N2, 180 kg/hm2), and high N (N3, 240 kg/hm2), and fully irrigated (W3, 75%~85%FC) and local N application level (300 kg/hm2) were used as control treatments. 【Result】 The results showed that the combination of water and nitrogen significantly (P<0.05) affected the net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), transpiration rate (Tr) and stomatal conductance (Gs) of pigmented marigold leaves at different fertility periods compared with CK. The photosynthesis indexes in all four periods showed the trend of increasing and then decreasing with the increase of N application, and reached the highest at the medium N level. The yield of pigmented marigold reached the highest in the second crop, with the highest treatment being W3N2 (16.26 t.ha-1); and the lowest in the third crop, with the lowest treatment being W1N1 (7.67t.ha-1). All the different nitrogen applications had significant (P<0.05) effects on the yield of pigmented marigolds, and the total yield was increased by 32.21% and 22.76% in the medium nitrogen level compared to the low nitrogen level and the high nitrogen level, respectively. Based on the analysis of TOPSIS comprehensive evaluation method, the combined score of fully irrigated and medium nitrogen level treatment (W3N2) was the highest. 【Conclusion】 Therefore, the treatment with irrigation of 75%~85% FC + nitrogen application of 180 kg/hm2 was recommended to be the optimal water and nitrogen regulation, and the results of this study can provide theoretical basis for the efficient production and scientific water and fertilizer management of the flower industry, such as pigmented marigolds of the Hexi oasis. |
| Key words: water-nitrogen regulation; photosynthesis; yield; comprehensive evaluation; pigmented marigolds |
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