增加率会改变微生物的动态和可用的土壤 P 在津巴布韦的Lixisol中
Tonny P Tauro1,2, Hatirarami Nezomba1, Florence Mtambanengwe1
1Department of Soil Science & Environment, University of Zimbabwe, Harare, Zimbabwe.
PloS one
|September 8, 2023
概括
土壤 (P) 缺乏影响粮食安全. 将有机资源与较高的P肥率相结合,可以促进微生物活动,P的可用性和在沙土上玉米的生长.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 土壤 (P) 缺乏是撒哈拉以南非洲作物生产和粮食安全的关键限制.
- 土壤微生物在通过矿化和固定化过程调节 (P) 可用性方面发挥着至关重要的作用.
- 土壤微生物的有效性受到土壤P水平,肥料应用和植物P吸收的影响.
研究的目的:
- 研究不同有机资源质量和无机 (P) 肥料比率对土壤微生物动态的影响.
- 评估对土壤P池和玉米P吸收在沙性土壤 (Lixisols) 的影响.
- 为优化P管理提供建议,以提高津巴布韦的玉米产量.
主要方法:
- 一项16个季节的实地研究,应用有机资源 (Crotalaria juncea,Calliandra calothyrsus,牛,玉米,Pinus patula) 随后进行了盆栽研究.
- 实验增加无机P肥量 (26和36公斤P ha-1).
- 监测土壤微生物群落,土壤P分数和玉米的P吸收.
主要成果:
- 鉴定了19种真菌和42种细菌殖民地,最初主导的是Aspergillus niger.
- 微生物多样性在29日左右达到峰值,与增加的P可用性相关,特别是与中高质量的有机资源和更高的P率相关.
- 细菌对P添加的反应比真菌更强;单独使用P而没有其他营养素,P的吸收不会得到增强.
结论:
- 建议同时使用中高质量的有机资源和较高的P肥料率,以提高微生物多样性,土壤P可用性和在沙土上的玉米产量.
- 对于沙土上玉米的现有P肥料建议可能需要修订.
- 开发新的肥料配方对于加强津巴布韦的作物生产至关重要.
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