An experiment was conducted to evaluate the effects of row spacing (RS) and interplant spacing (IPS) on the yield of total biomass, leaf, and edible twigs, and nutritive value of pigeon pea (Cajanus cajan L. Millsp.) at three locations in the Rift Valley area of Ethiopia. The authors used a randomized completed block design with three replications in 3 × 3 factorial arrangement: three RS (25, 50, and 75 cm) and three IPS (15, 30, and 45 cm). Row spacing × IPS of 25 × 30 cm and 50 × 15 cm gave greater total biomass yield than the other RS and IPS combinations. A similar result was found for edible plant yield. At Hawassa, the greater leaf crude protein was found for the wider IPS of 45 cm than the narrower IPS of 30 cm (318 vs. 303 g kg^–1). At Wondo-Genet, the greater leaf in vitro digestible organic matter (597 vs. 582 g kg^–1) was found for the wider RS of 75 cm than narrower RS. Similar to leaf, a better nutritional value of edible twigs was found for a wider RS and IPS than narrower RS and IPS at Hawassa and Wondo-Genet. In contrast at Aliyu-Amba, a better nutritional value of edible twigs was found for narrower RS and IPS than the wider spacing. Thus, it can be concluded that RS × IPS of 25 × 30 cm or 50 × 15 cm are advisable for pigeon pea forage production.

中文翻译：

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位置和株距影响木豆草料的生物量产量和营养价值

进行了一项实验，以评估行距 (RS) 和株间距 (IPS) 对三个地点的木豆 ( Cajanus cajan L. Millsp.) 总生物量、叶片和可食用树枝的产量以及营养价值的影响在埃塞俄比亚的裂谷地区。作者使用了一个随机完整区组设计，三个重复以 3 × 3 因子排列：三个 RS（25、50 和 75 cm）和三个 IPS（15、30 和 45 cm）。25 × 30 cm 和 50 × 15 cm 的行间距 × IPS 比其他 RS 和 IPS 组合产生更大的总生物量产量。食用植物产量也发现了类似的结果。在 Hawassa，发现 45 cm 较宽 IPS 比 30 cm 较窄 IPS 的叶片粗蛋白含量更高（318 对 303 g kg ^–1）。在 Wondo-Genet，发现 75 cm 的宽 RS 比窄 RS的叶片体外可消化有机物质更大（597 对 582 g kg ^{–1 ）。}与叶子相似，在 Hawassa 和 Wondo-Genet 发现较宽的 RS 和 IPS 比较窄的 RS 和 IPS 的可食用树枝具有更好的营养价值。相比之下，在 Aliyu-Amba，发现更窄的 RS 和 IPS 比更宽的间距具有更好的食用树枝的营养价值。因此，可以得出结论，25 × 30 cm 或 50 × 15 cm 的 RS × IPS 适合生产木豆草料。