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研究了３∶１式麦套棉田不同群体结构（源库比）条件下，干物质生产分配与棉花产量构成因素。结果表明，公顷株数７．５万，果枝６７．５万个左右有利于扩大源，从而提高总铃数和子棉产量。果枝数降低，虽有利于改善成铃结构，提高成铃率和伏桃比重，但缩小了源库比（叶铃比），单铃重略降，产量降低。据此可以认为：增加总果枝数，扩大源，以提高干物质的积累量，是提高子棉产量的前提，适当提高种植密度并采用相应的配套栽培措施，是提高棉花产量的有效途径。
The distribution of dry matter production and the composition of cotton yield were studied under the conditions of different population structure (source-sink ratio) of 3: 1 wheat straw field. The results showed that the number of plants per hectare was 75,000 and the number of fruiting branches was about 675,000, which was beneficial to expand the source, so as to increase the total number of bolls and the yield of cotton seed. Although the number of fruiting branches decreased, it was beneficial to improve the boll structure and increase the boll ratio and peach proportion, but the source-to-tub ratio (leaf boll ratio) was reduced and the single boll weight decreased slightly while the yield decreased. Based on this, it can be considered that increasing the total number of branches and expanding the source to increase the accumulation of dry matter is the prerequisite for raising the yield of cotton seed. Properly increasing the planting density and using corresponding cultivation measures is an effective way to increase the cotton yield.