大豆生长、光合及产量品质对叶面肥施用次数和时期的响应OA

To fully utilize the effect of foliar fertilizer on increasing soybean yield,an experiment was conduc-ted to study the effects of foliar fertilizer application frequency and timing on soybean growth,photosynthesis,yield and grain quality.The results showed that F1(spraying at the beginning of flowering stage)was more beneficial than F2(spraying at the beginning of pod stage)and F3(spraying at the beginning of filling stage)for increasing fresh leaf weight per plant,dry leaf weight per plant,fresh root weight,dry root weight,fresh root weight growth rate,dry root weight growth rate and dry matter accumulation rate of population,and spraying foliar fertilizer twice F4(initial of flowering stage+initial of pod stage),F5(initial of flowering stage+initial of filling stage),F6(initial of pod stage+initial of filling stage)in improving the above indexes were better than spraying foliar fertilizer once F1,F2,and F3.Spraying foliar fertilizer once F2 was the most beneficial for increasing chlorophyll content and photosynthetic rate,while F1 had the highest canopy photosynthetically active radiation;spraying foliar fertilizer twice F4 had the highest values of chlorophyll content,photosynthetic rate and canopy photosynthetically active radiation,compared to F1,F2,and F3,F4 significantly increased chlorophyll content and canopy photosynthetically active radiation at filling stage by 8.22％,7.08％,9.89％and 9.25％,13.36％,16.78％,respectively.Compared to spraying foliar fertilizer once,spraying foliar fertilizer twice sig-nificantly increased the dry weight of soybean population,and compared to CK,spraying foliar fertilizer once and twice could enhance yield by 82.34-327.86 kg/ha and 318.91-463.98 kg/ha,respectively.Although spraying foliar fertilizer twice was more beneficial for increasing the protein content of soybean grain when compared to spra-ying foliar fertilizer once,the effect was insignificant,spraying foliar fertilizer at the initial of flowering stage+initial of pod stage was the most effective way to increase protein content.Overall,spraying foliar fertilizer once at the be-ginning of the flowering period was the most beneficial for improving soybean growth,photosynthetic characteristics and yield,while spraying at the beginning of the pod stage was the most beneficial for improving protein content,and spraying foliar fertilizer twice at the beginning of flowering stage+beginning of the pod stage had the best effect.