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IoT-driven smart agricultural technology for real-time soil and crop optimization

Authors: Hammad Shahab,Muhammad Naeem,Muhammad Iqbal,Muhammad Aqeel,Syed Sajid Ullah
Journal: Smart Agricultural Technology
Publisher: Elsevier BV
Publish date: 2025-3
ISSN: 2772-3755 DOI: 10.1016/j.atech.2025.100847
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In Section 4, the authors state:

“The soil pH ranged from 7.13 to 8.33, indicating a generally neutral to slightly alkaline pH across the samples… Sample 3 had the highest nitrogen content at 103 mg/kg, which could support strong vegetative development.”
 
They further assert:

“Rice plants typically thrive in slightly acidic to neutral soil (pH 5.5–7.0), but the observed pH values are within acceptable limits for rice cultivation.”
 
And conclude:

“Samples with pH values above 8… indicate a risk of reduced absorption of nutrients, especially phosphorus…”
 
While this last sentence acknowledges a potential issue, the overall tone suggests that such high pH is still “acceptable” , which contradicts well-established agronomic science and their own data.

 In fact, rice (Oryza sativa) does NOT grow optimally in alkaline soils (pH > 7.5).

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