| Potato yield is determined by genetic factors,environmental factors and management strategies.In the process of yield formation,cultivation measures can be adjusted to create good conditions for potato growth and development,track the characteristics of aboveground biomass changes during the whole reproductive period of potato,and reasonably allocate the accumulation and transfer of above-ground biomass to achieve high yield.Therefore,it is very important to coordinate the growth of above-ground biomass and underground tubers of potato and maintain the appropriate ratio of above-ground.In this study,we used the Chinese government to collect the literature on domestic potato field trials from 2004 to 2021,and used the Meta-Analysis method to select articles containing aboveground and tuber dry matter quality and yield of potato at each fertility stage,and counted the above-ground and tuber biomass,total yield,potato variety and other indicators.We used the Meta-Analysis method to screen relevant articles containing above-ground and tuber dry matter quality and yield of potato at different fertility stages,and to determine the equilibrium relationship between above-ground biomass and below-ground tubers at different maturity of potato,and to investigate the response of potato yield formation to above-ground dry matter accumulation and distribution pattern through data analysis based on field trials,in order to provide theoretical basis for potato cultivation.Based on the literature investigation,the dynamics of dry matter accumulation in aboveground of early-maturing,middle-maturing and late-maturing varieties showed a parabolic trend,and the growth peak of aboveground of early-maturing,middle-maturing and late-maturing varieties moved later with the extension of growth period,and the aboveground growth peak was 63 d,86 d and 106 d after emergence,respectively,which all appeared in the starch accumulation stage.In terms of the influence of aboveground biomass on yield,the aboveground biomass of early,middle and late ripening potato varieties at seedling stage and tuber formation stage had a poor correlation with yield.The aboveground biomass and yield of early and middle ripening potato varieties at tuber expansion stage and starch accumulation stage showed a parabolic trend with a good correlation,but the correlation was poor at late ripening stage.The equilibrium stage(dry matter weight of aboveground stem and leaf was equal to dry matter weight of underground tuber)of early,middle and late ripening varieties appeared later,but all appeared in tuber expansion stage,and aboveground biomass had a significant effect on potato yield during tuber expansion stage.The "scissor difference"(the difference between tuber and shoot dry weight at maturity stage)of early,middle and late ripening varieties had a significant effect on potato yield,and the increase of "scissor difference" could effectively improve potato yield,but when it increased to a certain extent,potato yield would not increase or even decrease.The results of field verification also proved that the aboveground biomass of early maturing and late maturing varieties had no significant effect on yield at seedling stage and tuber formation stage,while the relationship between tuber expansion stage and yield was the best,showing a parabolic trend.The aboveground biomass of tuber expansion stage could be regulated to improve yield.The dry weight equilibrium stage of potato was controlled from tuber swelling stage to starch accumulation stage,and the time of equilibrium stage could be regulated by nitrogen fertilizer management to delay the time of equilibrium stage,so as to achieve the purpose of high yield.Both literature research and field validation showed that "scissor difference" had significant effect on potato yield.The increase of "scissor difference" could effectively improve potato yield,but the yield would not increase if "scissor difference" was too large.The above results show that the control of above-ground biomass during tuber expansion is the most critical,and the dry weight balance period can be regulated by nutrient management measures from tuber expansion to the early stage of starch accumulation,delaying the emergence of this period in the balance period to finally achieve the purpose of high yield,and a moderate increase in the "scissor difference",the greater the yield. |
