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Evaluate multiple plant tissue testing techniques to improve nitrogen fertilizer management and reduce nitrate leaching into groundwater during irrigated corn production.

June 1, 1994Communications in Soil Science and Plant Analysis

Techniques for monitoring crop nitrogen status in corn

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Evaluate multiple plant tissue testing techniques to improve nitrogen fertilizer management and reduce nitrate leaching into groundwater during irrigated corn production.
Evaluated tissue testing approaches, including traditional leaf nitrogen analysis, in-field chlorophyll meter sensing, and post-harvest stalk nitrate tests, in irrigated Nebraska corn fields.
Compared sensor readings and tissue concentrations across hybrid varieties, growth stages, and high-nitrogen reference test plots.
Chlorophyll meter readings correlated strongly with grain yield, successfully detected early nitrogen deficiencies without interference from luxury consumption, and facilitated as-needed fertilizer applications.
Leaf nitrogen concentrations proved difficult to standardize due to inconsistent critical threshold levels across different hybrids, growth stages, and luxury nutrient consumption.
The post-harvest stalk nitrate test accurately detected excess crop nitrogen availability without requiring an in-field reference strip, effectively identifying environmental risk.

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Implication

Comparative evaluation demonstrates diagnostic utility of tissue testing techniques in irrigated corn, suggesting targeted strategies to prevent groundwater nitrate contamination.

Cite This Study

Blackmer et al. (1994) studied this question.

synapsesocial.com/papers/6a7107b031a3df82432941db https://doi.org/10.1080/00103629409369153

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Implication

Comparative evaluation demonstrates diagnostic utility of tissue testing techniques in irrigated corn, suggesting targeted strategies to prevent groundwater nitrate contamination.

Techniques for monitoring crop nitrogen status in corn

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Discussion

Implication

Cite This Study

Techniques for monitoring crop nitrogen status in corn

Key Points

Discussion

Implication

Cite This Study

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