Luo Zhen, Tang Wei, Wang Xiaowen, Lu Hequan, Li Chenyang, Liang Jun, Kong Xiangqiang
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan, Shandong, China.
College of Life Sciences, Shandong Normal University, Jinan, China.
Front Plant Sci. 2024 Apr 26;15:1394285. doi: 10.3389/fpls.2024.1394285. eCollection 2024.
Drip irrigation under mulch film promotes a non-uniform salinity distribution in salt fields. The effect of different N application methods on the growth and yield of cotton under drip irrigation under mulch film conditions in eastern coastal saline-alkaline soils in China remain remained unclear.
A randomized complete block design was used in the experiment. Three N application methods were assigned: N applied under mulch film (low-salinity area; UM), N applied between mulch films (high-salinity area; BM), and half N applied under mulch film and half between mulch films (HUHB).
Plant height, photosynthesis, Chl content, boll load, biomass, boll weight and boll density under UM were all significantly higher than those under the other two treatments. The N absorption of UM was higher than in the other two treatments, which might be attributed to the expression of GHNRT1.5 and GHNRT2.1. The net NO3- influx in the roots in UM increased significantly compared with that in BM. The yield and FNRE of UM were 3.9% and 9.1%, respectively, and were 26.52% and 90.36% higher than under HUHB and BM treatments.
UM not only improved cotton yield but also alleviated the pollution of N residue on drip irrigation under mulch film conditions in salt areas.
地膜覆盖滴灌导致盐田盐分分布不均。在中国东部沿海盐碱地，地膜覆盖滴灌条件下不同施氮方式对棉花生长和产量的影响尚不清楚。
试验采用随机区组设计。设置三种施氮方式：膜下施氮（低盐度区；UM）、膜间施氮（高盐度区；BM）以及膜下和膜间各施一半氮（HUHB）。
UM处理下的株高、光合作用、叶绿素含量、棉铃负载量、生物量、单铃重和铃密度均显著高于其他两种处理。UM处理的氮吸收量高于其他两种处理，这可能归因于GHNRT1.5和GHNRT2.1的表达。与BM处理相比，UM处理根系中净硝酸根流入量显著增加。UM处理的产量和肥料氮回收效率分别为3.9%和9.1%，分别比HUHB和BM处理高26.52%和90.36%。
UM处理不仅提高了棉花产量，还减轻了盐区地膜覆盖滴灌条件下氮残留的污染。
