Forage peanut (Arachis pintoi) is considered a legume ideotype for use in mixed pastures in humid tropical regions, but its adoption has been hindered by low availability and high prices of commercial seeds. However, there is a concern if breeding of high seed-yielding cultivars could result in loss of compatibility with grasses. This study compared the competitive ability and spreading ability of 12 forage peanut genotypes with contrasting seed-yielding potential in mixtures with Brachiaria humidicola in northern Brazil. These genotypes were previously selected for high performance under clipping in pure stands. Twenty-five rooted stolons of forage peanut were transplanted to the central area (1 × 1 m) of each plot (5 × 5 m) seeded 35 days before with B. humidicola. The experiment used a randomized complete block design with five replicates per genotype and was evaluated under grazing from 6 to 30 months after pasture establishment using the intermittent stocking method. All genotypes persisted and increased their proportion in botanical composition over time. Spread of forage peanut stolons into surrounding B. humidicola sward varied from 0.56 to 1.46 m/year. Cultivar BRS Mandobi had the greatest competitive ability and cultivar Belomonte the greatest spreading ability. Two genotypes (cv. BRS Mandobi and accession BRA-00064752-9) were selected combining high seed-yielding and high compatibility with B. humidicola. This is evidence that both traits (compatibility with grasses and seed yield) can be simultaneously improved in this legume. The results are discussed in terms of the ecology of grass-legume mixtures and breeding of forage peanut.

中文翻译：

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牧草花生在热带混交草场的竞争与传播能力

饲料花生 ( Arachis pintoi ) 被认为是一种豆科植物，可用于潮湿热带地区的混合牧场，但由于供应不足和商业种子价格高昂，阻碍了其采用。然而，人们担心高产品种的培育是否会导致与草的相容性丧失。本研究比较了巴西北部12 种牧草花生基因型的竞争能力和传播能力，以及与Brachiaria humidicola混合的种子产量潜力。这些基因型以前被选为在纯林中修剪下的高性能。将 25 根已生根的牧草花生匍匐茎移植到每个小区 (5 × 5 m) 的中心区域 (1 × 1 m)，在 35 天前播种B. humidicola. 该试验采用随机完整区组设计，每个基因型重复 5 次，并在牧场建立后 6 至 30 个月的放牧条件下使用间歇放养法进行评估。随着时间的推移，所有基因型都持续存在并增加了它们在植物成分中的比例。牧草花生匍匐茎向周围B. humidicola草地的传播从 0.56 到 1.46 m/年不等。品种BRS Mandobi 的竞争能力最强，品种Belomonte 的传播能力最强。选择了两个基因型（品种 BRS Mandobi 和加入 BRA-00064752-9），结合了高种子产量和与B的高相容性。湿菌. 这证明了这种豆科植物的两种性状（与草的相容性和种子产量）都可以同时得到改善。从草豆类混合物生态学和牧草花生育种等方面对研究结果进行了讨论。