Agronomic and Economic Potential of Tughutu and Minjingu Phosphate Rock as Alternative Phosphorus So

• 作 者: P.A.NDAKIDEMI
• 机 构: ResearchandTechnologyPromotion
• 出 处: Pedosphere
• 发表日期: 2007年6期
• 关键词: 土壤 磷酸盐 浓缩 养分 integrated nutrient management marginal rate of return P concentr

<正>On-farm experiments were conducted in farmers' fields at 6 different sites in Western Usambara Mountains(WUM)in northern Tanzania during the 2000-2001 cropping season.The objectives were to study the effects of Tughutu(Vernonia subligera O.Ho