College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, 1 Yingmen Village, Lanzhou, 730000, Gansu Province, China.
College of Civil Engineering, Hexi University, Zhangye, 734000, China.
Sci Rep. 2021 Aug 30;11(1):17356. doi: 10.1038/s41598-021-96747-0.
Isatis indigotica is a commercial medicinal crop that is widely cultivated with high water and nutrient application, in the arid areas of northwest China. Rational irrigation and nitrogen application are key factors for successful crop management. The objective of this study was to determine the effect of water and nitrogen coupling on the photosynthetic characteristics, yield, and quality of Isatis indigotica produced in northwestern China. Field trials were conducted for 2 consecutive years at an irrigation test station. Data on photosynthetic parameters, yield, and quality were collected from individual Isatis indigotica for each treatment during 2018-2019. The application of nitrogen significantly increased photosynthetic rates and yield under the same irrigation conditions. However, the yields were reduced in the excess water treatments (W3N1 and W3N2) and in the excess nitrogen treatments (W1N3, W2N3, and W3N3) in contrast to the optimum W2N2 treatment. Moreover, the quality indicators of the W2N2 treatment decreased compared with CK, which was due to water stress and more photoassimilates being available to the roots, but the effective quality index value could be effectively improved by greatly increasing the yield.
菘蓝是一种商业药用作物，在中国西北干旱地区广泛种植，需大量用水和施肥。合理灌溉和氮素供应是作物管理成功的关键因素。本研究旨在确定水氮耦合对中国西北地区菘蓝光合作用特性、产量和品质的影响。连续两年在灌溉试验站进行田间试验。2018-2019 年，对各处理的单个菘蓝进行了光合作用参数、产量和品质数据的收集。在相同灌溉条件下，氮素的施加显著提高了光合作用速率和产量。然而，与最佳 W2N2 处理相比，过量水（W3N1 和 W3N2）和过量氮（W1N3、W2N3 和 W3N3）处理下的产量降低。此外，与 CK 相比，W2N2 处理的质量指标下降，这是由于水胁迫和更多的光合产物可用于根部，但通过大幅提高产量可以有效提高有效质量指数值。
