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建国以来,我省小麦品种更换了5次,小麦平均亩产由不足50公斤提高到247公斤,提高了近5倍。每次更换品种,都使小麦产量登上一个新台阶。但是近几年来,以百农3217为代表的第5次更新换代品种,随着生产条件的改善和生产水平的提高,以及白粉病和条锈病生理小种的不断变化,叶枯、纹枯病等多种病害加重,高产栽培措施不当,倒伏普遍严重,在中产区产量表现稳面不高,在高产区产量表现低而不稳。以宛7107为唯一当家种的南阳地区,由于品种单一化。产量已连续3年下降。事实告戒我们,
Since the founding of the PRC, wheat varieties in our province have been replaced 5 times, the average yield of wheat from less than 50 kg to 247 kg, an increase of nearly 5 times. Each change of species, make wheat yield to a new level. However, in recent years, the fifth replacement variety represented by 100Nong3217, along with the improvement of production conditions and improvement of production level, and the continuous changes of physiological race of powdery mildew and stripe rust, leaf blight and sheath blight And other diseases aggravated, improper cultivation measures of high yield, lodging generally serious, stable yield in the middle part of the yield is not high, low and unstable yield in the high yield area. To 7107 as the only species of Nanyang species, due to a single species. Output has dropped for three consecutive years. The truth tells us,