Background and aims

Low-grade potassium (K) bearing minerals like waste mica and K-rich crop residues can be explored as an alternative K source. However, waste mica's low available K limits its efficacy. This study aims to use waste mica with a native K solubilizing bacteria (KSB) isolated from Alfisols near mica mines along with rice residue to enhance K availability in a K deficient Alfisol.

Methods

A novel KSB (JHKSB4), identified as Acinetobacter sp was isolated from soils of mica mining areas in Jharkhand, India. An incubation and pot experiment were conducted using JHKSB4, waste mica and rice residue in a K-deficient Alfisol to assess the release of K fractions and K recovery percentage.

Results

Incubation study revealed that waste mica with JHKSB4 and rice residue significantly increased the water-soluble K and exchangeable K contents in soil over mica alone. Pot experiment revealed that combination of mica, JHKSB4 and rice residue could increase 43-61% K uptake by wheat over control but could not exceed the impact of muriate of potash (MOP). Residual impact of this treatment was also observed on K recovery in rice crop. The changes in surface morphology of mica through scanning electron microscopy indicated dissolution of waste mica due to action of JHKSB4 and rice residue.

Conclusions

This study established the potential of waste mica treated with JHKSB4 and rice residue as a supplementary K-source for crops. It recorded a K recovery of about 33% of that achieved with MOP. Thus, use of biologically treated waste mica could be a gamechanger in the realm of sustainable K management by partially replacing MOP.

中文翻译：

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使用新型溶钾细菌和缺钾 Alfisol 中的稻渣探索废云母作为替代钾源

 背景和目标

低品位含钾 (K) 矿物（如废云母和富含钾的作物残渣）可作为替代钾源。然而，废云母的有效钾含量较低，限制了其功效。本研究旨在使用废云母以及从云母矿附近的 Alfisols 中分离出的天然溶钾细菌 (KSB) 以及稻渣，以提高缺钾 Alfisol 中钾的利用率。

 方法

从印度贾坎德邦云母矿区的土壤中分离出一种新型 KSB (JHKSB4)，被鉴定为不动杆菌。使用 JHKSB4、废云母和稻渣在缺钾 Alfisol 中进行孵化和盆栽实验，以评估钾组分的释放和钾回收百分比。

 结果

孵化研究表明，与单独的云母相比，含有JHKSB4和稻渣的废云母显着增加了土壤中水溶性钾和交换性钾的含量。盆栽试验表明，云母、JHKSB4 和稻渣的组合可以使小麦对钾的吸收量比对照增加 43-61%，但不能超过氯化钾 (MOP) 的影响。还观察到这种处理对水稻作物钾回收的残留影响。通过扫描电子显微镜观察云母表面形态的变化表明废云母由于JHKSB4和稻渣的作用而溶解。

 结论

这项研究确定了经 JHKSB4 和稻渣处理的废云母作为农作物补充钾源的潜力。其 K 回收率约为 MOP 回收率的 33%。因此，使用经过生物处理的废云母可以通过部分替代 MOP 来改变可持续钾管理领域的游戏规则。