Effect of nitrogen fertilization management on mineral nitrogen content in soil and winter wheat productivity
Laen...
Kuupäev
2019
Kättesaadav alates
Autorid
Skudra, I.
Ruza, A.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
In recent years farmers must use integrated crop growing principles. One of the most
important principle isto balance usage of mineral elementsin crop cultivation, especially nitrogen
management. Excessive and unbalanced usage of nitrogen fertilizer reduces nitrogen use
efficiency and increases nitrate leaching in surface and groundwater. The dynamics of nitrogen
forms in soil at different depths and different plant growth stages are studied to increase the
productivity of winter wheat, promoting nitrogen uptake in plants and reducing nitrogen leaching
during the vegetation period. Field experiments were carried out at the Research and Training
Farm Vecauce of the Latvia University of Life Science and Technologies from 2012 till 2015.
Researched factors were nitrogen (N) fertilizer rate: 0 – control, 85, 153, 187, and N rate
determined by chlorophylmeter (Yara N-tester) 180 (2012/2013), 150 (2013/2014), 205
(2014/2015) N kg ha-1
, nitrogen and sulphur (S) fertilizer rate – N175+S21 kg ha-1
, and
conditions of the growing seasons: 2012/2013, 2013/2014 and 2014/2015. The content of nitrate
(NO3–N) nitrogen and ammonium (NH4–N) nitrogen was determined in the soil layers 0–20 cm,
20–40 cm and 40–60 cm at the growth stages (GS) 30–32, 49–51, 69 and 90–92. All trial years
the amount of nitrate nitrogen and ammonium nitrogen in soil decreased during vegetation, but
increased with increasing fertilization dose. Nitrate nitrogen content was significantly influenced
by year in 0–40 cm soil layer (P < 0.01) and by nitrogen fertilizer in the 20–40 cm soil layer.
Ammonium nitrogen content had significant influence only on nitrogen fertilizer at 20–40 cm
soil layer (P < 0.05). Average grain yields did not show significant correlation with the nitrate
nitrogen and ammonium nitrogen in different soil layers and plant growth stages, except nitrate
nitrogen content in soil layer 40–60 cm at GS 30–32 and ammonium nitrogen content in soil layer
40–60 cm at GS 69 and GS 90–92.
Kirjeldus
Article
Märksõnad
ammonium nitrogen, nitrate nitrogen, fertilizer, wheat, articles