Effects of Composite Substrates with Different Ratios of Potato Straw on Yield and Economic Benefit of Potato Pre-basic Seeds

Fan Yi; Li Yajie; Zhang Juanning; Kong Lehui; Chen Xiaoli; Tan Weijun; Han Jingren

doi:10.14083/j.issn.1001-4942.2025.11.010

Abstract：To investigate the impact of using potato straw as a component in cultivation substrate on pota-to pre-basic seed production,an experiment was conducted using cultivars Longshu 7 and Jizhangshu 12 as test subjects.The cultivation substrates were formulated by combining potato straw,peat soil and vermiculite at dif-ferent volume ratios,resulting in six distinct mixture treatments(CK:100%vermiculite;T1:20%potato straw+50%peat soil+30%vermiculite;T2:30%potato straw+40%peat soil+30%vermiculite;T3:50%potato straw+20%peat soil+30%vermiculite;T4:70%potato straw+30%vermiculite;T5:100%potato straw).The effects of these substrates on the growth and development of virus-free potato plantlets and the yield and economic benefits of pre-basic seeds were studied.The results indicated that the composite sub-strates with an appropriate proportion of potato straw significantly improved the physicochemical properties and promoted the growth and development of virus-free plantlets compared to the CK treatment.The T1 treatment yielded the highest number of tubers per plot(0.75 m2),total output,economic benefit and output-input ratio for the both cultivars,and for Longshu 7,these values were 549.33 tubers,2.5791 million yuan per hectare,1.7375 million yuan per hectare and 3.06,respectively,while for Jizhangshu 12,the values were 348.33 tu-bers,1.5180 million yuan per hectare,0.6764 yuan per hectare and 1.80,respectively.The study demonstra-ted that potato straw could be utilized in cultivation substrates for propagating potato pre-basic seeds.Specific-ally,the composite substrate comprising 20%straw,50%peat soil and 30%vermiculite(T1)offered a sig-nificant increase in economic benefit compared to the traditional vermiculite substrate(CK),showing promis-ing application potential.