In order to select suitable nitrogen application rates and planting densities for the green and sustain-able production of dryland potatoes in dryland farming area of central Gansu.In this study,'Longshu 16'was se-lected as the test potato variety.Two nitrogen application rates 200 kg·hm-2(N1)and 300 kg·hm-2(N2)and three planting densities 37 500 plants·hm-2(D1),52 500 plants·hm-2(D2),and 67 500 plants·hm-2(D3)were used,resulting in a total of six treatments.The effects of these treatments on the photosynthetic characteristics,dry matter accumulation,and yield of'Longshu 16'were examined.The results showed that the leaf area index of N1D2 treatment was 11.91％higher than that of N1D1 treatment during starch accumulation stage.At the tuber swelling stage,the activity of Rubisco enzyme in N1D2 treatment was increased by 9.05％com-pared with N1D3 treatment.From tuber swelling stage to starch accumulation stage,the photosynthetic rate,transpi-ration rate and stomatal conductance of leaves in N1D2 treatment were the largest,and the dry matter accumulation was increased by 5.29％～31.12％and 8.82％～27.49％,respectively,compared with other treatments.The yield and economic benefits were the highest under N1D2 treatment.In 2022,it increased by 6.14％～36.21％and 5.13％～169.16％compared with other treatments,and in 2023,it increased by 4.11％～29.46％and 21.56％～76.55％.The recommended nitrogen application rate for'Longshu 16'production in the Longzhong arid agricultural region is 200 kg·hm-2,with a planting density of 52 500 plants·hm-2.This combination can enhance economic benefits while maintaining yield.
维普
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