engleski

Changes of Nitrate Nitrogen in Sugar Beet Petioles Fresh Tissue during Season with Regard to Nitrogen Fertilization and Plant Population

The aim of this study was to test NO3– content of petioles wet tissue by means of reflectometric determination (Reflectoquant®) with regard to different nitrogen fertilization and plant population. The Serenade KWS variety was sown on March 18th, 2014 in three plant populations: 140, 000 ; 100, 000 and 60, 000 plants ha–1. Spring nitrogen fertilization was applied as follows: 0 – control, 45 kg ha–1 (pre sowing) and 99 kg ha–1(pre sowing with topdressing in mid­May). The fresh leaves petioles were collected manually in 6 terms from the end of May to September (73, 94, 114, 134, 155 and 176 days after sowing). On June 20th (94 days after sowing) the highest NO3– concentration in petiole wet tissue was determined at 60, 000 plants ha–1 (1, 594.17 mg kg–1) which was about 30% higher as compared to 140, 000 plants ha–1. Furthermore, at the same date, petioles at the highest nitrogen rate had 1, 709.17 mg kg–1NO3– in petiole wet tissue, which was about 40% higher as compared to control. This method can be adapted for sugar beet petioles analysis as fast and easy method to test and monitor the NO3– content of the crop and growth stage.

sugar beet ; plant population ; nitrate nitrogen ; reflectometer ; petiole fresh tissue

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