Abstract
The application efficiency of portable photometric nitrate tester “Spectrolyuks” produced domestically and «Yara» produced foreign for online diagnostics of nitrogen nutrition of agricultural crops in the link of field crop rotation reviewed. The results of a field test conducted in 2012-2015 in the Central Region of Non-Chernozem zone on spring grain crops (barley, triticale) and white mustard, shown the positive effect of a photometric devices application. The data photometric diagnostics obtained in the initial phase of crops development (stem elongation on the barley and triticale, budding on the white mustard) had a strong correlation dependency with crop yield of the link of the field crop rotation and stem diagnostics scores.
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