Development of stomatal conductance of maize under moderately hot, dry production conditions
Laen...
Kuupäev
2021
Kättesaadav alates
Autorid
Széles, A.
Horváth, É.
Rácz, D.
Dúzs, L.
Bojtor, Cs.
Huzsvai, L.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
A field trial was conducted in Hungary, in a moderately warm, dry production area to
determine the effect of single or split application of N-fertilizer on the stomatal conductance and
grain yield of maize. The measurements were performed at on calcareous chernozem soil, in a
strip field trial, under different weather conditions (2019 and 2020). In addition to the unfertilized
control (A0) treatment, 60 (A60) and 120 kg N ha-1
(A120) applied as spring basal fertilizer were
followed by two top-dressing treatments in V6 (A90) and V12 (A120) phenophases with doses of
+30 and +30 kg N ha-1
, respectively. Stomatal conductance measurements were taken at V6, V12
and R1 phenological phases. It was found that stomatal conductance showed a decreasing trend
with advancing phenological phases in both years, with 43.9% and 32.1% (P < 0.001; P < 0.01)
decreases by the R1 phase, respectively. Application of higher doses of N fertilizer increased
stomatal conductance, with the exception of the R1 phenological phase, which showed a decrease
compared to the A0 treatment. The decrease in 2019 was caused by a reduction of soil moisture.
Although there was sufficient water in the soil in 2020, due to the intermittent water shortages
caused by but the large leaf area and rapid transpiration of the plants resulted in the stomata to
close. The best fertilisation strategy was A60 and A120 kg ha-1 depending on the crop year. The
study showed that the highest yield is obtained when the average stomatal conductance is around
250 mmol m-2 s
-1 during the growing season.
Kirjeldus
Received: January 29th, 2021 ; Accepted: November 10th, 2021 ; Published: November 12th, 2021 ; Correspondence: szelesa@agr.unideb.hu
Märksõnad
maize, stomatal conductance, fertilization, articles