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利用99个不完全双列杂交组合和17个CHA杂种．研究了在单株点播和正常密植条件下川西CHA杂交小麦的产量及产量构成超标优势特点。结果表明：1、在单株条件下，产量超标优势较大（＞15％）的组合是稳、粒、重三要素在较高水平上的协调提高的结果，产量优势主要来源于穗粒数优势和一定的有效稳优势。2、在密植条件下．具有较大产量超标优势（＞10％）的组合产量优势主要来源于穗粒数和千粒重优势。并以稳粒数优势起主导作用。3、单株；点播条件下的产量优势大于密植。单株点播下的产量超标优势不能预测正常密植下杂交组合的产量超标优势．而只能作为参考，要正确评价和预测杂交小麦的产量优势，只有在密植条件下进行。4、产量优势较大的组合都是稳、粒、重三要素在较高水平协调统一的结果。千粒重是限制川西CHA杂交小麦产量提高的主要因素．在CHA杂交小麦高产的育种和栽培中，应在维持产量三要素在较高水平协调统一的基础，将重点放在粒重的提高上。5、杂交小麦产量优势近似地等于有效稳、穗粒数和千粒重优势之代数和。
Utilizing 99 incomplete double crosses and 17 CHA hybrids. The yield and yield of CHA hybrid wheat in western Sichuan Province under the conditions of single plant sowing and normal close planting were studied. The results showed that: (1) Under the single plant condition, the combination with greater yield (> 15%) was the result of the coordinated improvement of the three factors of stability, grain and heavy at the higher level. The yield advantage mainly came from the number of grains per spike Advantages and certain effective stability advantage. 2, in close planting conditions. The combined yield superiority with larger output overweight (> 10%) mainly comes from the number of grains per spike and the 1000-grain weight. And to stabilize the number of grains play a leading role. 3, single plant; on-demand yield advantage is greater than close planting. The advantage of over-standard yield under monocropping can not predict the yield superiority of hybrid combinations under normal inoculation. But only as a reference, to correctly evaluate and predict the yield advantage of hybrid wheat, only in close planting conditions. 4, a larger yield advantage of the combination are stable, grain, heavy three elements at a higher level of coordination and unity of the results. Thousand grain weight is the main factor limiting the yield of CHA hybrid wheat in western Sichuan. Breeding and cultivation of high-yielding hybrid wheat in CHA should be based on the principle of maintaining a high level of coordination of the three elements of yield, with an emphasis on increasing grain weight. 5, the yield advantage of hybrid wheat is approximately equal to the effective stability, grain number and 1000 grain weight advantage of the algebra and.