The Effects of Sowing Methods and Fertilizer Rate on Photosynthetic Characteristics of the Flag Leaf and Yield of Winter Wheat of Xinong 979

To explore the effective cultivation techniques of Xinong 979,the effect of two sowing methods and six fertilizer levels on the photosynthetic characteristics,yield components and yield of Xinong 979were studied,through measuring the SPAD,net photosynthetic rate,transpiration rate and related indicators.The result indicated that:(1)Spike number reached significant difference between precision and general sowing,but the grain per spike,1000-grain mass and the yield didn't have a significant difference.(2)The SPAD value and transpiration rate increases firstly and then decreases,with the increasing of fertilizer rate.Net photosynthetic rate of no fertilizer treatment was the highest during flowering period,was higher than fertilizing treatments significantly,then falling rapidly,and was the least on the 22days after flowering.(3)The correlation of grains per spike and spike number was significant inverse.The correlation of yield with 1000-grain mass,grains per spike and spike number was positive(r=0.571,0.364,0.202).(4)The yield of Xinong 979of B3(pure nitrogen 180kg/hm2,P2O5120kg/hm2,K2O 75kg/hm2)was the highest under precision and general sowing.B3was the best fertilizer level,reaching the significant level with other treatments under general sowing;B3had no significant difference with B2(pure nitrogen 135 kg/hm2,P2O5 90 kg/hm2,K2O 45kg/hm2)and B4(pure nitrogen 225kg/hm2,P2O5120kg/hm2,K2O 75kg/hm2) under precision seeding.Therefore,B2,B3,B4was the best.