Effects of nitrogen fertilizer reduction and biochar application on population structure,photosynthetic characteristics and yield of spring wheat
[Objective]This study further carried out the research on the impact of biochar single applica-tion and combined application of nitrogen fertilizer on the population structure,photosynthetic characteristics and yield of spring wheat in irrigation areas,aiming to provide scientific basis for the rational use of biochar and fertilizer.[Methods]The experiment adopted a randomized block design,set up 2 nitrogen fertilizer ap-plication levels(0,150 kg/hm2)and 4 levels of biomass charcoal(0,10,20,30 t/hm2)for research.After that,the population structure,photosynthetic characteristics and yield of Xinchun 46 wheat were analyzed in 2020.[Results]The results showed that under B2N1 treatment,nitrogen fertilizer reduction(150 kg/hm2),compared to medium biomass charcoal(20 t/hm2)under the combined application,the population structure,leaf area index,leaf SPAD value,net photosynthetic rate,and yield of spring wheat all reached the optimal level,increased by 15.04％to 32.98％,3.67％to 89.82％,5.63％to 11.46％,17.95％to 81.68％,and 29.73％compared to the control,respectively.Compared with the control,the single application of bio-char and the combination of biochar and nitrogen fertilizer increased spring wheat yield by 7.52％to 29.73％.[Conclusion]Nitrogen fertilizer is reduced by 150 kg/hm2 and applied in combination with 20 t/hm2(B2N1)biochar has the best effect in increasing production.
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