Tariro Gwandu, Noxolo S. Lukashe, Jairos Rurinda, Wendy Stone, Stephen Chivasa, Catherine E. Clarke, Hatirarami Nezomba, Florence Mtambanengwe, Paul Mapfumo, Jan G. Steytler, Karen L. Johnson
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引用次数: 0
Abstract
Introduction
Soil degradation coupled with poor access to organic nutrient resources remains a major constraint in increased crop productivity in sub-Saharan Africa, thus hindering the continent's efforts in achieving the United Nations' Sustainable Development Goals, particularly goals 1 (end poverty), 2 (zero hunger) and 3 (improve human health). Water treatment residual (WTR), a by-product of clean water treatment, has been identified as an alternative organic nutrient resource for crop production. However, there are some inconsistences in soil phosphorus (P) dynamics following aluminium WTR (Al-WTR) application.
Materials & Methods
A laboratory experiment was conducted to evaluate the P sorption of a sandy soil amended with 10% Al-WTR, 10% compost (C) as a quasi-control, 10% C + 10% Al-WTR (10% coamendment) and 5% C + 5% Al-WTR (5% coamendment) under varying levels of pH, particle size and P concentration. We calculated crop P fertilizer requirements under different amendments.
Results
The results demonstrated that all amendments exceeded the minimum of 0.2 mg P L−1 needed in soil solution at equilibrium to maintain plant growth. However, the maximum P sorption capacity was higher for 10% Al-WTR single amendment, ranging from 770 to 1000 mg P Kg−1, and from 714 to 1000 mg P Kg−1 and 555 to 909 mg P Kg−1 for 10% and 5% coamendments, respectively, across a range of pH and soil particle size fractions. The coamendments showed a reduction in crop P fertilizer requirements by ranges of 30–60% and 60–70% for the 10% and 5% coamendment levels, respectively, across different pH and particle sizes, relative to 10% Al-WTR.
Conclusion
Results show that the use of 5% coamendment in sandy soils increases P availability sufficiently to improve crop yields. The results provide scope for using Al-WTR coamendments to rebuild soil health in sandy soils in urban agriculture and increase macronutrient provision in crops to support human health.
引言土壤退化加上难以获得有机营养资源,仍然是撒哈拉以南非洲提高作物生产力的主要制约因素,从而阻碍了非洲大陆实现联合国可持续发展目标,特别是目标1(消除贫困)、目标2(零饥饿)和目标3(改善人类健康)的努力。水处理残留物(WTR)是清洁水处理的副产品,已被确定为作物生产的替代有机营养资源。然而,施用铝WTR(Al-WTR)后,土壤磷(P)动态存在一些不一致性。材料&;方法采用室内试验方法,在不同pH、粒径和磷浓度的条件下,分别用10%Al-WTR、10%堆肥(C)作为准对照、10%C+10%Al-WTR(10%助剂)和5%C+5%Al-WTR(5%助剂)对沙质土壤的磷吸附性能进行了评价。我们计算了不同修正案下的作物磷肥需求量。结果所有改良剂均超过了土壤溶液平衡时维持植物生长所需的最低0.2 mg P L−1。然而,在一定的pH值和土壤粒径分数范围内,10%Al-WTR单一改良剂的最大磷吸附能力更高,范围为770至1000 mg P Kg−1,10%和5%的改良剂的最高磷吸附能力分别为714至1000 mg P Kg−1和555至909 mg P Kg−1。相对于10%的Al WTR,在不同的pH和颗粒尺寸下,10%和5%的添加剂水平分别使作物对磷肥的需求减少了30-60%和60-70%。结论在沙质土壤中施用5%的混凝剂,可充分提高磷的有效性,提高作物产量。研究结果为在城市农业中使用Al-WTR助剂重建沙质土壤的土壤健康提供了空间,并增加了作物中的宏量养分供应,以支持人类健康。