The cereal–legume cropping system is a common practice across the tropical world. However, there are limited quantitative data on the effect of cereal–legume intercropping on weed species diversity. A study was conducted in the Guinea savanna zone of Ghana to evaluate the effect of maize–soybean intercropping on yield productivity and weed species control. The treatments used include three maize maturity types (extra‐early: Abontem, early: Sammaz 27 and medium: Obatanpa) intercropped with soybean at three intraspacing (10, 20 and 30 cm), and their sole crop treatments were laid in a randomized complete block design with three replications. Results showed that the land equivalent ratio (LER) for the intercrops was above 1, indicating better intercrop productivity than the sole crops. An average of 40% land was saved for the intercrops compared with the sole crops. Intercropping Sammaz 27 maize with soybean significantly increased LER by 9% compared to the other types. Intercropping maize with soybean significantly reduced weed biomass at 6 and 9 weeks after planting (WAP) and at harvest relative to the sole maize. The weed biomass at 6 and 9 WAP and harvest increased (p < .05) with increasing soybean intraspacing. The grass and broadleaf weed species count at 6 WAP and harvest from the sole crops were significantly higher than that of the intercrops. The results suggest that intercropping early maize maturity type with soybean at 10 cm intraspacing could be used to increase grain yield, LER and control of grass and broadleaf weeds in a maize‐based cropping system in the Guinea savanna zones of West Africa.

中文翻译：

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玉米-大豆间作对加纳北部产量、杂草控制和多样性的影响

谷物 - 豆类种植系统是热带世界的常见做法。然而，关于谷类-豆科植物间作对杂草物种多样性影响的定量数据有限。在加纳的几内亚稀树草原地区进行了一项研究，以评估玉米-大豆间作对产量生产力和杂草种类控制的影响。使用的处理包括三种玉米成熟类型（超早：Abontem，早：Sammaz 27 和中：Obatanpa）与大豆以三个间距（10、20 和 30 厘米）间作，它们的唯一作物处理是在随机完整具有三个重复的块设计。结果表明，间作的土地当量比（LER）大于1，表明间作比单一作物的生产力更高。与单一作物相比，间作平均节省了 40% 的土地。与其他类型相比，将 Sammaz 27 玉米与大豆间作显着提高了 9% 的 LER。与单种玉米相比，在种植后 6 周和 9 周（WAP）和收获时，玉米与大豆间作显着降低了杂草生物量。6 和 9 WAP 和收获时的杂草生物量随着大豆间距的增加而增加 (p < .05)。6 WAP 的禾本科和阔叶杂草种类数和单季作物的收成显着高于间作。结果表明，在西非几内亚稀树草原区的玉米种植系统中，早熟玉米与大豆间作 10 厘米间距可用于提高谷物产量、LER 和控制禾本科和阔叶杂草。与其他类型相比，将 Sammaz 27 玉米与大豆间作显着提高了 9% 的 LER。与单种玉米相比，在种植后 6 周和 9 周（WAP）和收获时，玉米与大豆间作显着降低了杂草生物量。6 和 9 WAP 和收获时的杂草生物量随着大豆间距的增加而增加 (p < .05)。6 WAP 的禾本科和阔叶杂草种类数和单季作物的收成显着高于间作。结果表明，在西非几内亚稀树草原区的玉米种植系统中，早熟玉米与大豆间作 10 厘米间距可用于提高谷物产量、LER 和控制禾本科和阔叶杂草。与其他类型相比，将 Sammaz 27 玉米与大豆间作显着提高了 9% 的 LER。与单种玉米相比，在种植后 6 周和 9 周（WAP）和收获时，玉米与大豆间作显着降低了杂草生物量。6 和 9 WAP 和收获时的杂草生物量随着大豆间距的增加而增加 (p < .05)。6 WAP 的禾本科和阔叶杂草种类数和单季作物的收成显着高于间作。结果表明，在西非几内亚稀树草原区的玉米种植系统中，早熟玉米与大豆间作 10 厘米间距可用于提高谷物产量、LER 和控制禾本科和阔叶杂草。