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土壤有机质对冷地型草坪草种子产量的形成有实质性影响，在供试的４个品种（“鳄鱼”黑麦草、“得碧”黑麦草、“墨瑞特”早熟禾、“猎犬”高羊茅）中，其相关系数分别为０．９７，０．９８，０．９３和０．８８。各处理种子单产排序为：草—豆轮作＞草—豆间作＞蚕豆前茬地连作＞小麦前茬地连作，与极端产量比较，黑麦草高达２．４～３．２倍，早熟禾和苇状羊茅分别高出４２．３％～５５．９％和３８．６％～５１．３％。不同前茬地连作处理，蚕豆茬地明显优于小麦茬地，但从播后第３年起，黑麦草种子产量均呈逐年下降趋势，且以豆茬地更甚。
Soil organic matter had a significant effect on the seed yield formation of the cold-type turfgrass. Four cultivars of “Triticum aestivum” (“Crocodile” ryegrass, “Derby” ryegrass, “Murray” Fescue), the correlation coefficients were 0.97, 0.98, 0.93 and 0.88, respectively. The order of yield per treatment was as follows: grass-bean rotation> grass-bean intercropping> continuous production of broad bean stubble continuous cropping> continuous cropping of wheat stubble. Compared with the extreme yield, ryegrass was as high as 2.4 to 3.2 times, Tall fescue were 42.3% ~ 55.9% and 38.6% ~ 51.3% higher, respectively. Different stubble continuous cropping treatment, broad bean stubble was significantly better than wheat stubble, but from the third year after sowing, ryegrass seed yield showed a downward trend year by year, and to stubble even more.