Effects of growth regulating substances and density on the efficiency of seed potato multiplication

RAO Liping; ZOU Xue; CHEN Nianwei; YU Hankaizong; LIU Lifang; DING Fan

doi:10.16861/j.cnki.zggc.2024.0294

Abstract：To investigate the effects of growth regulating substances and density on the efficiency of seed potato multipli-cation,the original seed tubers of the varieties Heimeiren and Favorita were used as materials.Five treatments including CK(4000 plants·667 m-2),T1(6000 plants·667 m-2),T2(8000 plants·667 m-2),T3(4000 plants·667 m-2,and sprayed with 50 mg·L-1 GA3 and 30 mg·L-1 ABA),T4(4000 plants·667 m-2,and sprayed with 50 mg·L-1 GA3,30 mg·L-1 ABA and 60 pg·L-1BR)were set up,and their effects on potato growth morphology,yield,quality,and economic benefits were studied for two consecutive years.The results showed that compared to CK,the application of growth control treatments significantly increased plant height and significantly decreased leaf mass per unit area.Meanwhile,increasing planting density had a more pronounced effect on yield improvement compared to the use of growth regulators.For Heimeiren,the highest yield in 2020 was observed under T1,which increased by 69.91％compared to CK,while in 2021,the highest yield was under T2,with a 62.38％increase.For Favorita,T2 produced the the highest yields in both years,with increases of 82.93％in 2020 and 44.36％in 2021.Across all treatments,there were no significant differences in dry mater and anthocyanin content for both varieties.However,starch,vitamin C,reducing sugar,and crude protein content showed significant changes in Heimeiren but no significant changes in Favorita.In summary,8000 plants·667 m-2 was the suitable planting density for Heimeiren and Favorita,with yields of 2 158.82 kg 667 m-2 and 2 790.63 kg 667 m-2,respectively,and the estimated production value amounted to 3 892.28 Yuan·667 m-2 and 4 268.89 Yuan·667 m-2,respectively.