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Selenium fertilizers and foliar application, Danish experiments.

G Gissel-Nielsen

Annals of Clinical Research

|January 1, 1986

Summary

This summary is machine-generated.

Selenium (Se) deficiency was identified in Danish sheep in 1963. Studies revealed widespread Se deficiency in crops, leading to effective fertilization strategies to improve plant Se levels.

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Area of Science:

Agricultural Science
Animal Nutrition
Environmental Chemistry

Background:

Selenium (Se) deficiency was first observed in Danish sheep in 1963.
Initial surveys indicated a widespread Se deficiency in Danish fodder crops.

Purpose of the Study:

To investigate methods for increasing selenium levels in Danish crops.
To establish optimal selenium application rates for agricultural use.

Main Methods:

Conducted a survey of selenium status in Danish fodder crops using fluorometric analysis.
Experimented with three selenium application methods: seed pretreatment, fertilizer enrichment, and foliar application.
Performed large-scale farm trials across Denmark to validate findings.

Main Results:

General selenium deficiency was confirmed across Denmark.
Fertilizer enrichment and foliar application proved effective and safe for increasing crop selenium.
Recommended application rates: 120 g Se/ha (sodium selenite) or 10 g Se/ha (sodium selenate) via fertilizers, or 5 g Se/ha via foliar spray.

Conclusions:

Selenium fertilization is a viable strategy to address crop selenium deficiency in Denmark.
Optimized application methods ensure crop selenium levels reach the desired minimum of 0.05 ppm.
Yearly selenium treatments can elevate crop selenium content to 0.05-0.1 ppm.