Kasvuregulaatori ja kevadise täiendava lämmastikväetise mõju põldtimuti (Phleum pratense L.) seemnesaagile ja seemnete kvaliteedile
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Kuupäev
2021
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian Academic Agricultural Society
Abstrakt
The synergistic effect of the plant growth regulator Moddus
250 EC and nitrogen fertilizer on the seed yield and seed quality of timothy
was investigated over a period of four years (2017–2020) in a field trial
established with the cultivar 'Tika' in 2016 at the Estonian Crop Research
Institute. The trial had three variants: variant 1 – without plant growth
regulator (control), variant 2 – plant growth regulator sprayed twice at the
rate of 0.4 + 0.4 l ha–1
and variant 3 – plant growth regulator sprayed once
at the rate of 0.8 l ha–1
. In all three variants there were five nitrogen
fertilizer rates between N 70–140 kg ha–1
. In the trial the lodging resistance
of plant cover was monitored, the height of generative tillers was
measured, the seed yield was determined by two-phase combine
harvesting and the quality of seed was determined. No lodging of timothy
was detected in trial variants throughout all trial years. The increase of
nitrogen fertilizer rate did not reliably affect the height of generative
tillers, the split application of plant growth regulator shortened the height
of generative tillers on the average of four years by 7.4%, and one-time
spraying by 6.2%. The use of plant growth regulator did not increase the
seed yield, the split application of it even reduced the seed yield. The
increase of nitrogen fertilizer rate up to N 122 kg ha–1 increased the seed
yield reliably only in the first year of production, but not in the following
years. The use of plant growth regulator slowed down seed maturation, in
our trials it was confirmed by bigger amounts of seed in the second harvest
phase. The increase of nitrogen fertilizer rate and the use of plant growth
regulator did not have any effect on seed germination. In the first
production year, the 1000 kernel weight increased under the influence of
plant growth regulator, in the later years there was no effect. The
germination energy of seed somewhat decreased under the influence of
plant growth regulator.
Kirjeldus
Saabunud / Received 29.01.2021 ; Aktsepteeritud / Accepted 26.03.2021 ; Avaldatud veebis / Published online 26.03.2021 ; Vastutav autor / Corresponding author: Ants Bender ants.bender@etki.ee
Märksõnad
timothy grass, plant growth regulator, fertilization, lodging resistance, seed yield, seed quality, articles