| Regulation effects of different water and nitrogen combinations on watermelon growth, yield, and water and nitrogen use efficiency in sand removal field |
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| DOI：10.7606/j.issn.1000-7601.2025.01.19 |
| Key Words: selenomardia xiangshanensis sand removal land water and nitrogen combination water and nitrogen use efficiency Ningxia |
| Author Name | Affiliation | | LI Jiale | College of Horticulture, Northwest A&F University, Shaanxi, Yangling 712100, China | | XIAO Yuzhen | College of Horticulture, Northwest A&F University, Shaanxi, Yangling 712100, China | | WANG Xiang | College of Horticulture, Northwest A&F University, Shaanxi, Yangling 712100, China | | YANG Tian | College of Horticulture, Northwest A&F University, Shaanxi, Yangling 712100, China | | ZHANG Xian | College of Horticulture, Northwest A&F University, Shaanxi, Yangling 712100, China |
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| Abstract: |
| The watermelon cultivar ‘Jincheng No. 5’, the main watermelon cultivar in Zhongwei, Ningxia, was used as the experimental material for planting experiment. Three levels of irrigation were set: conventional irrigation (medium water W2, 3 000 m3·hm-2), conventional irrigation plus 20% (high water W3, 3 600 m3·hm-2), conventional irrigation minus 20% (low water W1, 2 400 m3·hm-2). Five nitrogen application levels including N0 (0 kg·hm-2), N1 (80 kg·hm-2), N2 (160 kg·hm-2), N3 (240 kg·hm-2), and N4 (320 kg·hm-2) were used in the experimental design, with a total of 15 treatments. The results showed that the growth of watermelon plants under high water treatment increased by 9.15%, 8.41%, 8.69%, 11.58% and 12.00%, respectively, compared with that under medium water treatment. Under medium water treatment, watermelon vine length of N2 increased by 5.42%~7.13% compared with N0, and 2.71%~16.67% under lower water treatment. The total soluble sugar content of watermelon under low water treatment decreased by 13.09% to 60.21% compared to medium water treatment, whereas under high water treatment, it decreased by 6.69% to 9.14%. The total soluble sugar under N2 treatment was increased by 21.19% and 70.47% compared with N0 under medium water and low water treatment, respectively. Under high water treatment, the total soluble sugar under N3 treatment was 8.25% higher than that under N0 treatment. Under the same nitrogen application, the promoting effect of irrigation on plant growth was W3>W2>W1, and the effect on watermelon quality was W2>W3>W1. The highest yield was 64 299.67 kg·hm-2 when the irrigation level was 3 600 m3·hm-2 and the nitrogen application was 240 kg·hm-2. Soil organic matter content and urease activity reached the highest level under T4 treatment. The total nitrogen content in the soil did not increase consistently with higher nitrogen application rates, however, it did increase gradually with higher irrigation levels. At the same irrigation level, the ammonium nitrogen content in the soil under N1, N2, N3, and N4 application conditions increased by 11.90%, 16.87%, 24.58%, and 46.39%, respectively, compared to N0. The increase of irrigation rate was beneficial to the increase of nitrogen partial productivity, but it will reduce the water use efficiency. When the nitrogen application rate increased from N0 to N4, the water use efficiency under W1 irrigation level was the highest. When the irrigation level was 3 600 m3·hm-2 and the nitrogen application rate was 240 kg·hm-2, the growth, yield and water and nitrogen use efficiency of watermelon were the best. |
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