Investigation of nitrogen turnover in Saldus experimental field (2015–2017) | Slāpekļa aprites pētījumi Saldus stacionārā (2015.–2017. gads)
2018
Lipenite, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Karklins, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture | Ruza, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Agriculture
Nitrogen use efficiency is still one of the most important topics in plant production. The crop yield and quality is closely related to nitrogen supply. As several factors contribute to this parameter, the assessment of N supply and calculation of fertiliser norms are of essential importance. The paper discusses the assessment parameters used for characterizing the efficiency of N use. Results of a field experiment with increasing nitrogen rates for winter (2015 and 2017) and spring (2016) wheat carried out in 2015–2017 were used. The yield of grain increased with the increase in fertiliser rate, whereas grain yield increase per 1 kg of N applied decreased, particularly when nitrogen application reached 120–180 kg haE-1 N. Nitrogen recovery from the fertilisers used was unstable and reached 35–75%, mainly due to the impact of weather conditions during the experimental period. A negative correlation was found between the physiological efficiency of N fertiliser use and protein content in grain. Therefore, certain compromise among the high N recovery rate, effective yield increments, and grain quality should be made.
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