Abstract:

To investigate the effects of salicylic acid(SA)spraying on potato physiology and yield under reduced basal fertiliser conditions,with a view to providing technical reference for hormone regulation to improve potato yield.The potato variety Dongnong 310 was used as the test material,and the field experiment was conducted using the randomised block group method.Five treatments were set:conventional basal fertiliser(T1),50% reduction of basal fertiliser(T2),50% reduction of basal fertiliser+spraying of 6.9 mg/L SA(T3),50% reduction of basal fertiliser+spraying of 13.8 mg/L SA(T4)and 50% reduction of basal fertiliser+spraying of 27.6 mg/L SA(T5).Samples were taken at the early tuber formation,late tuber formation,tuber growth stage and starch accumulation stage,and plant height,stem thickness,relative chlorophyll content,photosynthetic parameters,fluorescence kinetic parameters,canopy coverage and yield were determined.The results showed that under weight loss treatment,spraying salicylic acid could promote potato growth and increase yield per unit area.Among the four SA treatments in the same period,T3 and T4 treatments could increase potato plant height,stem thickness,Net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), photochemical quenching coefficient(qP)and starch content;and T4 and T5 treatments could increase potato canopy coverage,Fv/Fm,maximum electron transport rate(ETRmax), and half-saturated light intensity(Ik).Spraying different concentrations of SA had a significant effect on the yield of potato tuber under the weight-loss treatments,and T1,T3,T4,and T5 treatments were significantly higher than T2,increasing 36.74%,27.35%,29.83%,22.96%.The number of potatoes produced per plant was highest in T1 treatment,followed by T4,and the difference between the two was not significant,and T1,T3,and T4 treatments were 33.47%,28.28%,and 30.29% higher than T2.Single plant yield of T1,T3,T4 and T5 treatments increased by 35.19%,27.87%,28.76%,23.39% compared to T2.The commercial potato rate T3 and T4 increased by 3.67, 3.72 percentage points compared with T2,and the differences were significant.In summary,exogenous SA increased the Pn,Tr and Gs of potato leaves under 50% reduction of basal fertilizer treatment,and increased the yield per unit area,and the spraying of 13.8 mg/L SA in the pre-tuber formation stage could effectively alleviate the adverse effects of reduced basal fertilizer on the growth and yield of potato.

Key words: Potato, Base fertilizer reduction, Salicylic acid, Photosynthesis, Yield

CLC Number: 

• S532马铃薯(土豆)

• S14肥料学