| Effects of water and nitrogen supply on chlorophyll content and photosynthetic rate of greenhouse cucumber |
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| DOI：10.7606/j.issn.1000-7601.2016.05.30 |
| Key Words: greenhouse cucumber water and nitrogen supply fertigation chlorophyll content photosynthetic rate |
| Author Name | Affiliation | | LI Jing | College of Water Resources and Architectural Engineering , Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Land Construction Group, Xi'an, Shaanxi 710075, China | | LI Zhi-jun | College of Water Resources and Architectural Engineering , Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Fu-cang | College of Water Resources and Architectural Engineering , Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | FANG Dong-ping | College of Water Resources and Architectural Engineering , Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Hai-dong | College of Water Resources and Architectural Engineering , Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Choosing ‘Bonai 9-1’ as the test cultivar, the greenhouse plot experiment was subjected to three irrigation water levels W1 (60% ET0), W2 (80% ET0) and W3 (100% ET0), the irrigation of the whole growth period of cucumber were 126, 152 mm and 177 mm, respectively, in interaction with four nitrogen fertilization levels ［N0 (0 kg·hm-2), N1 (180 kg·hm-2), N2 (360 kg·hm-2), N3 (540 kg·hm-2)］, and there were 12 treatments in total. The effects of different water and nitrogen supply on chlorophyll content and photosynthetic rate of greenhouse cucumber were investigated. The results showed that: the chlorophyll content of cucumber showed an increasing trend and then decreasing with the growth progress, and obtained the maximum in full fruit. Improving irrigation played a catalytic role on chlorophyll content under the same nitrogen level. The maximum of total chlorophyll content which was 12.32 mg·g-1 was obtained under W3N3 treatment, and had no significant differences with W2N2 treatment. Under the various water and nitrogen supply conditions, the diurnal variation of Pn of cucumber appeared unimodal curve. No nitrogen or severe water deficit significantly affected net photosynthetic rate of cucumber, and appropriate water and fertilizer saving management not only could save the cost of agriculture, but also could achieve the better net photosynthetic rate comparing to full irrigation and fertilization. The net photosynthetic rate of cucumber leaves obtained the maximum under treatment W2 with a stronger and more stable light irradiation. Comparing the general trend, W2N2 treatment (80% ET0, N 360 kg·hm-2) was the more appropriate combination of water and nitrogen based on the experimental conditions. |
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