The effects of ammonium phosphate fertilization on yield and yield components of Mustard varieties in chernozem soil by Bibigul Khamzina, Berdibek Bulashev, Yerbol Nurmanov, Tamara Tultabayeva, Nurgul Nurmukhanbetova, Dana Toimbayeva, Ayazhan Igimbay, Gulnar Myrzabayeva

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