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Evaluation of Natural Rock Powder as a Potassium Source for Onion (Allium cepa L.) Cultivation
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Scientists tested whether crushed natural rock could replace synthetic potassium fertilizer for growing onions—a more eco-friendly option since mining and processing chemical fertilizers takes a heavy environmental toll. Onions grew just as big either way, but the rock powder released potassium into the plants more slowly, meaning farmers would need better methods (like grinding it finer or applying it differently) to make this sustainable alternative work as well as traditional fertilizer. This matters for consumers because it's part of ongoing efforts to make food production greener without sacrificing crop quality or yield.
This study was conducted to evaluate the potential of natural rock powder (NRP), derived from potassium (K) feldspar, as an eco-friendly K fertilizer for onion (Allium cepa L.) cultivation under vinyl mulching conditions.The experimental design included a mineral fertilizer control and various NRP treatments (standard rate, double rate, micro-particles, and foliar application).The results showed no significant differences in onion fresh weight or bulb diameter across all treatments, suggesting that NRP can support basic crop growth.However, the K content in plant tissues was lower in NRP-treated plots compared to the control, with significant reductions observed in the NRP-2 and NRP-MP groups.This lower K uptake is attributed to the low solubility of NRP and its tendency to remain on the mulch surface during top-dressing, which limits nutrient penetration into the soil.Lab-scale elution tests confirmed that the control released approximately twice as much cumulative K as the NRP treatments, although Si release was comparable due to the mineral composition of the raw material.While NRP shows promise as a sustainable K source, enhancing its solubility through formulation improvements or specialized application methods is essential to optimize its efficacy in plastic-mulched cropping systems.
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Researchers found that microplastic fibers at 0.4% concentration in soil disrupted potassium, magnesium, and sulfur uptake in onions, but that inoculation with arbuscular mycorrhizal fungi buffered these negative effects by enhancing nutrient availability and plant uptake.
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Researchers fabricated a potassium metaphosphate–silica nanocomposite as a polymer-free, controlled-release fertilizer source for potassium and phosphorus, demonstrating prolonged nutrient release in soil-relevant conditions and improved black bean growth compared to conventional fast-release fertilizers.
Data from: Liquid-applied biodegradable mulches control weeds and protect yield in organic onion production
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Farmers growing organic onions typically rely on plastic sheeting to block weeds, but that plastic breaks down into microplastic fragments that pollute soil over time. Researchers tested a plant-based alternative, a sprayable mixture of recycled paper and guar gum (a natural thickener), and found it controlled weeds and produced yields nearly as good as plastic, without leaving lasting waste behind. This matters because reducing plastic mulch use could mean less microplastic contamination in the soil that grows our food, though the biodegradable option isn't quite as effective as plastic yet.
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