品种、种植年限等因子对苜蓿白粉病和霜霉病发病影响的初步研究
품충、충식년한등인자대목숙백분병화상매병발병영향적초보연구
Preliminary Research on Influence of Variety, Planting Term,etc.on Alfalfa Powdery Mildew and Downy Mildew
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