不同养分配方对大豆生长、光合生理特征及养分吸收利用的影响OA

In order to enhance the soybean production capacity in Yongcheng city,Henan Province,a field experiment was conducted to study the effects of various nutrient ratios[treatment 1:NPK 15-15-15(ordinary compound fertilizer),treatment 2:NPK 18-10-12(ordinary compound fertilizer)+foliar fertilizer,treatment 3:Rhizobium inoculation with NPK 18-20-10(humic acid combined fertilizer+foliar fertilizer)]on soybean photosynthetic physiological characteristics,yield,and nutrient absorption and utilization.The results showed that different nutrient treatments did not affect the soil pH in soybean fields.At flowering stage,the organic matter content,available phosphorus,quick-acting potassium,and total nitrogen in treatment 2 and treatment 3 were significantly higher than those in treatment 1.And the total nitrogen,total phosphorus,total potassium,total boron,and total molybdenum levels under treatment 3 were significantly higher than those under treatment 1.During different growth stages of soybeans,the photosynthetic rate,transpiration rate,stomatal conductance,and leaf water use efficiency were highest in treatment 3,followed by treatment 2,and lowest in treatment 1.At maturation stage,the nutrient uptake rates of stems and grains under treatment 3 were significantly higher,and plant and grain nitrogen,phosphorus,potassium,molybdenum,and boron levels under treatment 3 were increased by 3.1％-28.6％and 4.1％-13.7％,respectively,compared to treatment 1.At harvest,the organic matter,alkaline nitrogen,total nitrogen,and available boron under treatment 3 were significantly higher than those under treatment 1 and the lowest under treatment 2.Ultimately,the height,branching number,low pod height,pod number,grain weight,biomass and yield of soybean plants under treatment 2[NPK 15-15-15(ordinary compound fertilizer)]and treatment 3[NPK 18-10-12(ordinary compound fertilizer)+foliar fertilizer]were significantly higher than those in treatment 1[NPK 15-15-15(ordinary compound fertilizer)].The best increase of yield was achieved by treatment 3(application of humic acid organic fertilizer,biological agent and foliar fertilizer),with a 20.1％increase compared with the treatment 1(CK).