首页|Magnesium fertilizer application increases peanut growth and pod yield under reduced nitrogen application in southern China
Magnesium fertilizer application increases peanut growth and pod yield under reduced nitrogen application in southern China
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This study investigated the effect of magnesium application on peanut growth and yield under two nitro-gen(N)application rates in acidic soil in southern China.The chlorophyll content,net photosynthetic rate and dry matter accumulation of the N-sensitive cultivar decreased under reduced N treatments,whereas no effect was observed on the relevant indicators in the N-insensitive variety GH1026.Mg application increased the net photosynthetic rate by increasing the expression of genes involved in chlorophyll syn-thesis and Rubisco activity in the leaves during the pegging stage under 50％N treatment,while no effect on the net photosynthetic rate was observed under the 100％N treatment.The rate of dry matter accumu-lation at the early growth stage,total dry matter accumulation and pod yield at harvest increased after Mg application under 50％N treatment by increasing the transportation of assimilates from stems and leaves to pods in both peanut varieties,whereas no effect was found under 100％N treatment.Moreover,Mg application increased the NUE under 50％N treatment.No improvement of NUE in either peanut variety was found under 100％N treatment,while Mg application under the 50％N treatment can obtain a higher economic benefit than the 100％N treatment.In acidic soil,application of 307.5 kg ha-1 of Mg sulfate fertilizer under 50％reduced nitrogen application is a suitable fertilizer management mea-sure for improving carbon assimilation,NUE and achieve high peanut yields in southern China.
Guangdong Provincial Key Laboratory of Plant Molecular Breeding,College of Agriculture,South China Agricultural University,Guangzhou 510642,Guangdong,China
Shandong Academy of Agricultural Sciences,Jinan 250100,Shandong,China
College of Agriculture,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China
Guangdong Technical System of Peanut and Soybean IndustryChina Agriculture Research System
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