Optimization Of Seedling Raising Mode Of Sweet Potato In Eastern Hebei Province And Regulation Of Commercial Potato Formation In Production

Fresh-eating sweet potato has been paid more and more attention as a food with health functions.The market has put forward strict requirements on the shape of fresh-eating sweet potato tubers and the weight of single potato.It was more important to produce commercial potatoes with good shaped and suitable size of potato tubers.Efficient and environmental protection seedling raising method was the basised of sweet potato planting.Due to the large workload and heavy environmental pollution,traditional hot-dried seedling cultivation was limited in production.Creating an efficient and environmental protection seedling raising method has become a problem that must be solved in the current sweet potato planting process;For this reason,this experiment carried out relevant research on Optimization of electric heating seedling raising technology and potato shape control technology.The specific research results were as follows:1.Rinse seedling.Four kinds of seedling raising methods on the growth of sweet potato were studied in this paper.The results showed that the bed temperature of electric hot wire and straw + electric hot wire was the highest,the temperature of cold bed was the lowest,and the temperature difference between the lowest temperature and the highest temperature was 13.4 ℃.In the area with low temperature in early spring,the seedling emergence of potato bed was 15 days earlier than that of cold Kang and rice straw.The effected of different seedling raising methods on seedling traits of different varieties of sweet potato.The differences of plant height,stem diameter and leaf area of Luxuan-1 were more obvious than that of Yangshu-25,but that of Beijing-553 was significant.The differences of plant height,stem diameter and leaf area of Luxuan-1were more obvious than those of Beijing-553.2.Potato shape control test.Taking the common seedling of Yanshu-25 as the test material,the changes of agronomic characters,total yield and commercial tuberyield of Yanshu-25 were studied by designing 4 different transplanting periods and 6different planting nodes:Through the study of the correlation between the plant characters and the yield and the yield of medium-sized sweet potato,the results showed that the aboveground part of sweet potato had an indirect effect on the root tuber growth of sweet potato,while the number of tubers per plant and the quality of single plant directly affected the yield,and the number of tubers per plant directly affected the yield of medium-sized potato.Through the study of plant characters,yield and medium-sized tuber yield of different planting node number,different transplanting stage,in four different transplanting stages,with the delay of transplanting stage,the aboveground part of the characters,the number of tubers per plant and the quality of single plant decreased gradually,and the yield was the highest in late May;under the condition of six different planting nodes,the above ground characters were significantly different 3knots were the best.This study believes that when the number of transplanting nodes in late May was 3,it can effectively coordinate the relationship between the yield-related traits and can achieve high yield.