Effects Of Fertilization Volume And Density On Growth And Yield Quality Of Dryland Potatoes

In order to explore the suitable fertilization amount and density of dry-land potatoes and screen the dry-crop cultivation mode of suitable potatoes,the effects of three fertilization rates of 35,50,65 kg/667 m~2and three density treatments of 2500,3000 and3500 plants/667 m~2on the growth,photosynthetic characteristics,photosynthetic characteristics,yield and quality of potato C93 strains were studied by using the field randomized zone test method under the dry farming conditions in the northern foothills of Yin Mountain.The main conclusions are as follows:1.The plant height and stem thickness of potatoes are characterized by a trend of rapid growth before 40 days after emergence and gradually increasing to maximum after50 days.Before growing 20 days ago,the plant height and stem thickness of the low fertilization treatment grew rapidly,so in the first 40 days of growth,the fertilizer amount of 35kg/667m~2treatment was significantly higher than that of 50 and 65kg/667m~2;the growth of 40～50 days,the growth of high fertilization treatment accelerated,so there was no difference between the final plant height and stem thickness of each treatment.2.The potato leaf area index increased in a straight line with the progress of growth and development time,while the SPAD value showed a gradual decrease trend.In the first 50 days of growth and development,with the increase of fertilization,the leaf area index showed a decreasing trend,which was due to the fact that the leaf area index of low fertilization treatment increased relatively quickly in the first 20 days of growth,while the treatment of higher fertilization increased rapidly during the period of 30 to 40 days.As the sowing density increases,the leaf area index is greatest at 3500 plants/667 m~2treatment.3.The biomass of aboveground stems and roots of potatoes showed a trend of first increasing and then decreasing,while the biomass of leaves and tubers showed an upward trend,and 70 days after emergence,the tuber biomass was the largest.In the early stage of growth,the leaf,aboveground stem and root biomass were significantly higher than those treated with a fertilization rate of 35kg/667m~2,and the biomass was greatest at2500 plants/667m~2with the increase of density.The dry and fresh weight of leaves,aboveground stems and root biomass treated with a density of 2500 plants/667 m~2was the largest.4.Under the treatment of 35kg/667m~2fertilization and 2500 plants/667m~2of seeding density,the nitrogen,phosphorus and potassium accumulation of each organ was large,and the distribution of nitrogen,phosphorus and potassium in each organ was reasonable.5.Under the fertilizer application rate of 35kg/667m~2,the yield was1148.95kg/667m~2,which was 11.99%and 11.49%higher than that of 50 and 65kg/667m~2treatments,and the fertilizer productivity increased by 17.17%and 14.75%.Under the treatment of density of 2500 plants/667m~2,the yield was 0.92%and 1.25%higher than that of 3000 and 3500,respectively,and the partial fertility of fertilizer was increased by44.16%and 88.07%.6.In the production of C93 varieties of dryland potatoes similar to the experimental conditions in the northern foothills of Yinshan Mountain,Inner Mongolia,the fertilization amount was 35kg/667m~2and the sowing density was 2500 plants/667m~2,which could not only improve the yield,but also improve the fertilizer utilization efficiency.