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麦套稻因前期与小麦共生旱长，齐苗期长２～１４ｄ，出苗率低３６．２％～９１．３％，苗质弱，单位长度占有的干物重只及对照的１／３，营养生长滞后，但叶龄进程随生育期推进而明显加快，叶差由苗期的２．２个至拔节期为１．１个，抽穗期仅差２～３ｄ，即总生育天数与总叶片数相当；在器官建成上表现为个体生长不足而群体优势明显，亩成穗数多１０．１％～１３．１％。而每穗实粒数下降１４．１％～２２．１％，千粒重差异不大，最终产量差异不一致。试验以生育期适中的穗粒并重型品种、共生期３０ｄ左右为宜。
Due to the symbiotic drought of wheat and paddy rice in early stage, wheat seedlings grew 2 ~ 14 days long with low seedling rate of 36.2% ~ 91.3%. The dry weight of seedlings per plant was only 1/3 of the control, The vegetative growth lags behind, but the leaf age progress obviously accelerates with the growth period. The leaf difference is from 1.1 to 2.2 in the seedling stage and only 2 to 3 days in the heading stage, ie, the total number of days and the total number of leaves The number of the same; in the organ was built on the performance of the individual lack of growth and population obvious advantages, the number of acres into spike 10.1% ~ 13.1%. However, the number of grains per panicle dropped by 14.1% ~ 22.1%, the difference of 1000-grain weight was not significant, and the difference of final yield was inconsistent. Test to moderate growth ear grain and heavy varieties, symbiotic period of about 30d is appropriate.