Boron thresholds in irrigation supplies are deemed safe up to a limit of_________________?
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Answer: A. 0.7 ppm
Explanation
Boron concentrations in irrigation water are generally considered safe for most sensitive crops up to zero point seven ppm. Exceeding this threshold can lead to boron toxicity symptoms such as leaf marginal chlorosis and necrosis. Water quality assessments check boron levels carefully before approving supplies for agricultural irrigation. Boron is an essential micronutrient required by plants in trace amounts for cell wall formation. The range between plant deficiency and toxic excess for boron is remarkably narrow in agriculture. Irrigation water salinity and mineral composition directly impact long term soil fertility and crop health.
Farmers test irrigation sources routinely to prevent salt and boron accumulation in cultivated soils. Agricultural extension services provide guidelines on water quality standards to protect sensitive horticultural crops. Proper water management ensures sustainable crop production in arid regions utilizing mineral rich supplies. Higher limits like one point five ppm can cause toxicity in boron sensitive fruit and vegetable crops. Concentrations approaching two ppm exceed safe thresholds for standard agricultural irrigation practices. Levels reaching three ppm represent heavily mineralized water unsuitable for ordinary crop production.
- Subject
- Agriculture
- Category
- Agriculture
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- Difficulty
- medium
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