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同一品种来源不同,质量不同的玉米杂交种应用于生产,增产效果大不相同。纯度高、质量好的杂交种增产效果明显。据沈阳农业大学1980年试验,杂交玉米种子纯度每下降1%,亩减产9.1公斤左右。为准确确认杂交种纯度和使用价值,保证供应优质增产良种和评价某些种子生产经营单位的种子质量信誉,通常在种子收获后、销售前进行下代种植鉴定。
The same variety of different sources, different quality corn hybrids used in the production, yield-increasing effect is very different. High purity, good quality hybrids yield significantly. According to the experiment of Shenyang Agricultural University in 1980, the purity of hybrid corn decreased by 1% per acre and the output of mu reduced by 9.1 kg. In order to accurately confirm the purity and value of hybrids, ensure the supply of high-yielding varieties of seeds and evaluate the quality of seeds of some seed production and management units, the identification of the next generation is usually carried out after the seeds are harvested and sold.