Effect Of Nitrogen,Potassium,Nitrogen And Potassium Interaction On Yield And Quality And Nutrient Absorption Of Different Sweet Potatoes

Nitrogen and potassium interactions can affect the nutrient absorption and utilization of sweet potato and production,to study the optimal distribution of n bits of different varieties of sweet potato in the study.With three varieties of sweet potato(SS19,LS9,XS32 and YS25)as the experimental material,in shandong province in 2015 and 2016 in Tai'an City daiyue sanyo kitamura field experiment was carried out,the results show that:1.Between the different varieties of sweet potato best economic N application rate is different.Under this experimental condition,through regression analysis that the best ratio of nitrogen to economy of SS19 is 73.71 kg/hm~2,the best ratio of nitrogen to economy of XS32 is 74.46 kg/hm~2,the best ratio of nitrogen to economy of YS25 is 79.94 kg/hm~2.2.Between the different varieties of sweet potato best economic ratio of nitrogen to potassium K application rate is different.Under this experimental condition,through regression analysis that the best ratio of potassium to economy of SS19 is 90.16 kg/hm~2,the best ratio of potassium to economy of XS32 is 92.98 kg/hm~2,the best ratio of potassium to economy of YS25 is 99.43 kg/hm~2.3.Between the different varieties of sweet potato best economic ratio of nitrogen to potassium is different.Under this experimental condition,through regression analysis that the best ratio of nitrogen to potassium to economy of SS19 is N 74.73 kg/hm~2?K2O 105.97 kg/hm~2,the best ratio of nitrogen to potassium to economy of LS9 is N 65.07 kg/hm~2?K2O 86.72 kg/hm~2,the best ratio of nitrogen to potassium to economy of YS25 is N 65.12 kg/hm~2?K2O 92.13 kg/hm~2.4.Nitrogen and potassium interactions can increase the number of different varieties of sweet potato and potato,improve potato weight so as to improve the production of sweet potato,at the same time can increase the quality of sweet potato root dry matter,the differences between different varieties,YS25 root dry matter accumulation than other two varieties are improved obviously.5.Nitrogen and potassium interactions can reduce three varieties of sweet potato T/R ratio.The differences between different varieties,YS25 is higher relative to other two varieties of T/R,that easy to produce stem leaf overgrowing phenomenon.6.Nitrogen and potassium interactions can improve different varieties of sweet potato root nitrogen,there are differences between different varieties.The potato SS19 is significantly higher than other varieties of nitrogen uptake;The potato LS9 is significantly lower than other varieties of phosphorus uptake and the potato SS19 is significantly higher than other varieties of potassium uptake7.Nitrogen and potassium against each have great effects on the quality of sweet potato root,there are differences between different varieties.SS19 between different varieties of starch and protein content is significantly higher than other varieties,soluble sugar content is the YS25 highest relative.