Magnesium-fortified phosphate fertilizers improve nutrient uptake and plant growth without reducing phosphorus availability  

作　　者：Zhenya LU Yanyan WANG Fien DEGRYSE Chengdong HUANG Cuihong HOU Liangquan WU Rongfeng JIANG Michael J.MCLAUGHLIN Fusuo ZHANG 

机构地区：[1]College of Resources and Environmental Sciences,National Academy of Agriculture Green Development,Key Laboratory of Plant-Soil Interactions,Ministry of Education,China Agricultural University,Beijing 100193(China) [2]Department of Pomology,College of Horticulture,China Agricultural University,Beijing 100193(China) [3]Fertilizer Technology Research Centre,School of Agriculture,Food and Wine,University of Adelaide,PMB 1,Glen Osmond SA 5064(Australia) [4]School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001(China) [5]International Magnesium Institute,Fujian Agriculture and Forestry University,Fuzhou 350002(China)

出　　处：《Pedosphere》2022年第5期744-751,共8页土壤圈（英文版）

基　　金：financial supports from the National Key R&D Program(Nos.2016YFD0200401 and 2016YFE0103100);Science and Technology Plan of Yunnan Province,China(No.202102AE090053)。

摘　　要：Magnesium(Mg)deficiency can significantly limit crop yield and quality.Separate application of straight Mg fertilizer is unattractive because of additional labor costs.Meanwhile,bulk blending Mg with other macronutrient fertilizers is also a suboptimal solution because bulk blended fertilizers often yield poor nutrient distributions.One rapid and economical alternative to alleviating Mg deficiency is to co-granulate macronutrient fertilizers with Mg.However,few commercial products have implemented this approach.One of the barriers hindering the production of Mg-fortified phosphorus(P)fertilizers is the assumption that precipitation of P with Mg will reduce P solubility.In this study,four Mg compounds,anhydrous magnesium sulfate(MgSO_(4)),magnesium oxide(MgO),anhydrous magnesium chloride(MgCl_(2)),and dolomite(CaMg(CO_(3))_(2)),were co-granulated with mono-ammonium phosphate(MAP),and their granule strength,Mg and P availabilities,and agronomic effectiveness were evaluated.Results showed that there were no significant differences in P solubility between Mg-fortified MAP and MAP treatments.X-ray diffraction(XRD)indicated that the Mg species after co-granulation were boussingaultite(Mg(NH_(4))_(2)(SO_(4))_(2)·6H_(2)O),schertelite(Mg(NH_(4))_(2)H_(2)(PO_(4))_(2)·4H_(2)O),magnesium hydrogen phosphate(Mg(H_(2)PO_(4))_(2)),and dolomite(CaMg(CO_(3))_(2)).A pot experiment using an acidic soil demonstrated an average 9.6-fold increase in shoot Mg uptake,3.0-fold increase in shoot P uptake,and 3.2-fold increase in soybean shoot dry matter in Mg-fortified MAP treatments,compared to those in MAP treatment.The current study provides a simple,effective,and low-cost approach for the addition of Mg to macronutrient fertilizers,to minimize Mg deficiency.

关 键 词：agronomic effectiveness crop growth magnesium deficiency mono-ammonium phosphate macronutrient fertilizer P solubility X-ray diffraction(XRD) 

分 类 号：S143.2[农业科学—肥料学]