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September 10, 2025Frontiers in AgronomyOpen Access

Optimizing safe rates of pop-up inorganic starter nitrogen and potassium fertilizers for maize

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Greenhouse experiment establishes safe application rates for nitrogen and potassium fertilizers in maize, highlighting risks of toxicity.

Maximum safe rates of DAP and MAP vary by soil type, with DAP at 3 kg N ha-1 in fine soil.
Visual signs of toxicity were identified, including delayed emergence and leaf chlorosis associated with nitrogen fertilizers.
Quantitative indicators like shoot biomass and chlorophyll readings correlated with germination rates to support safe fertilizer recommendations.
Findings guide optimized starter fertilizer management to minimize risk while maximizing maize yield potential.

Makaza et al. (2025) studied this question.

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