雪灾后施肥对冬季亚麻生长恢复的影响OA

To investigate the effects of fertilization on the growth recovery of winter flax in Hunan after snow disasters and to support the"Southward Shift of Flax"strategy,field experiments were conducted in March 2024.Treatments including nitrogen fertilizer,compound fertilizer,and a no-fertilizer control(CK)were established in Datonghu,Yiyang(paddy and upland fields)and Liling,Zhuzhou(paddy fields).The results indicated that the low-temperature freezing injury in early 2024 delayed the technical maturity of flax by approximately 10 days.In the Datonghu paddy fields,the survival rates under nitrogen and compound fertilizer treatments reached 58.23%and 54.77%,respectively,compared to only 16.27%in the CK.Furthermore,the unprocessed stem yields in fertilization treatments approached 300 g/m2,while the CK yield was only 76.67 g/m2.In the Zhuzhou paddy fields,compound fertilizer increased the survival rate from 25.84%to 28.96%and enhanced the unprocessed stem yield from 125.83 g/m2 to 209.20 g/m2,representing a 66.4%increase.The efficacy of fertilization was dependent on both field type and fertilizer variety:in paddy fields,nitrogen fertilizer performed better in improving survival rates,whereas compound fertilizer was more effective in increasing unprocessed stem yield.In upland fields,compound fertilizer significantly improved stem yield,but seed yield was significantly lower than that in the paddy field compound fertilizer treatment.Regionally,the inhibitory effect of compound fertilizer on seed yield was stronger in Zhuzhou than in Datonghu.Principal component analysis(PCA)revealed that nitrogen fertilizer primarily promoted restorative indicators such as survival rate,plant height,and seed yield,while compound fertilizer favored the accumulation of stem biomass.Overall,post-disaster fertilization strategies should be tailored to specific field types(paddy vs.upland)and production goals(seedling preservation vs.yield increase)to maximize flax production benefits.