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1965年,我场引入“朝阳齐头白”谷种,表现出高产稳产、不倒伏、抗病等优点,因此,很快就在县内推广。但经过几年种植后,它表现出不同程度的退化现象。1970年以前,白发病在场内的发病率不到0.05％,1971年为0.4％,1972年上升至1％以上,而附近社队生产田的发病率一般达3～5％。可见,良种繁育工作,如果不注意去杂除劣,进行优中选优,
In 1965, I introduced the “Chaoyang Qitoubai” cereal and showed the advantages of high and stable yield, no lodging and disease resistance, therefore, it was soon promoted in the county. However, after several years of planting, it shows different degrees of degradation. Before 1970, the incidence of white-hair disease was less than 0.05% in the field, 0.4% in 1971 and increased to over 1% in 1972, while the incidence rate of nearby commune and farmer production fields was generally 3 to 5%. Can be seen, breeding breeding work, if you do not pay attention to miscellaneous and poor, excellent selection,