Effects Of Different Applying Nitrogen Models And Biological Seed Coating Agent On Physiological Characters, Yield And Quality In Spring Corn

Local main maize cultivators with different plant types, JY1 and FH10, wers studied oninfluences about different nitrogen application methods(nitrogen fertilizer, nitrogen fertilizer+nitrogen synergists, nitrogen fertilizer+biological fertilizer, nitrogen fertilizer+biologicalfertilizer+nitrogen synergists) and biological seed coating agent on the growth status, NRA,GSA,chlorophyll content, yield and quality with field and plot trials. The best nitrogen applicationmethod was screened out, and the effect of biological seed coating agents on yield and quality inmaize was definituded to provide a basis for nitrogen application and seed coating agent selectionin order to reduce pollution and increase production.NRA, GSA and photosynthetic rate of maize leaves changed as a single peak curve in the wholegrowth duration under different treatments, increasing along with the increasing amount of nitrogen,when more than a certain amount (urea 225kg/hm~2) starting lower; chlorophyll content of mosttreatments changed as a single peak curve, but individual treatment was a double peak curve, anddifferences weren't significant among all treatments. Ear length, ear diameter, 100-seed weight,grain yield and grain nutritious quality increased as the increasing amout of nitrogen, when morethan a certain amount (urea 225kg/hm~2) starting lower.Combined application of nitrogen synergists and urea promoted the growth of maize. NRA,GSA and photosynthetic rate of maize leaves increased, yield component factors and yield andquality were improved. Combined application of urea (225kg/hm~2) and synergists (6.75kg/hm~2)was best for the growth of maize, but combined application of urea (175kg/hm~2) and synergists(5.25kg/hm~2) could not completely meet the nitrogen requirements of the whole growth period inmaize.Effect of combined application of bio-fertilizer (37kg/hm~2) and urea (225kg/hm~2) on theincrease of production was not significant, but the effect was significant with adding nitrogensynergists (6.75kg/hm~2). Therefore, nitrogen synergists could improve urea utilization rate.Compared to no coating, biological seed coating agent promoted the growth of maize, andimproved NRA, GSA and photosynthetic rate. Effect of biological seed coating agent on theincrease of production was significant, and grain nutritious quality was improved, but the grainnutritious quality of FH10 was more significant than that of JY1. Grain yield of applicationbiological seed coating agent 1 was higher than that of biological seed coating agent 2, but grainnutritious quality of application biological seed coating agent 2 was higher than that of biological seed coating agent 1. Income of biological seed coating agent 1 treatment increased by18.1～1490.1 yuan per hectare compared to no coating, and income of biological seed coating 2treatment increased by 40.7～1141.0 yuan per hectare compared to no coating.NRA, GSA and photosynthetic rate were increased best with the combined application of urea(225kg/hm~2), synergists (6.75kg/hm~2) and biological seed coating agents 1 among differentcombined application of seed coating and nitrogen fertilizer in the whole growth period of maizeleaves, and ear diameter, 100-seed weight and yield per plant were high, but barren ear tip wassmall. Differences of grain yield were significant between this treatment and other treatments. Andgrain nutritious quality was better than that in the others. The yield increased by 0.83％～23.95％and income increased by 95.6～3034.3yuan per hectare than that in other treatments.