Effects of Different Magnesium Application Amounts on Photosynthetic Characteristics,Dry Matter Accumulation and Yield of Peanut in Red Soil
In order to study the influences of magnesium(Mg)to peanut growth and yield in red soil,the pot experiment was conducted with Huayu 25 as test variety by setting five Mg levels(Mg0:0 g/kg;Mg1:0.1 g/kg;Mg2:0.2 g/kg;Mg3:0.3 g/kg;Mg4:0.4 g/kg).The chlorophyll content,photosynthetic characteristics,Mg content,dry matter accumulation and pod yield at maturity stage of peanut were analyzed.The results showed that the growth and yield of peanut were obviously affected by the application of Mg fertiliz-er in a certain range during the whole growth period.The chlorophyll content reached the maximum under Mg2 treatment at flowering and peg forming stage,pod setting stage and maturity stage.At flowering and peg form-ing stage,the net photosynthetic rate,intercellular carbon dioxide concentration and stomatal conductance un-der Mg2 treatment were significantly higher than those of the other treatments.At pod setting stage and maturity stage,compared to Mg0 treatment,the dry matter accumulation under Mg2 treatment increased by 16.4% and 18.9% ,respectively,and the yield and full pod number per plant increased by 15.2% and 66.5% at maturity stage.Increasing Mg application amount to 0.3～0.4 g/kg(Mg3 and Mg4)made a significant negative effect on peanut growth.Comprehensively considering all the characters,the suitable Mg fertilizer application amount for Huayu 25 peanut in red soil was 0.2 g/kg in the experiment conditions.
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