The efficiency of combined application of mineral fertilizers, inoculants in soybean growing technology, and functioning of nitrogen-fixing symbiosis under increasing nitrogen rates
Laen...
Kuupäev
2022
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
Soy is a valuable leguminous crop, whose productivity directly depends on many
factors, among which nitrogen fertilizers are one of the most important. Nitrogen fertilizing of
this crop is often given insufficient attention because the yield increase can be quite insignificant.
The purpose of the research is to study the combined effect of biofertilizers and increasing rates
of nitrogen mineral fertilizers on the growth, development, and yield of soybean varieties. The
experiment is three-factorial: factor A - early ripening soybean varieties Annushka and Ustya,
factor B – seeds inoculation by biofertilizer, and factor C - rates of mineral fertilizers application.
Results of research shows the efficiency of nitrogen-fixing symbiosis during seed inoculation
was established for nitrogen rates from N0 to N60 against the background of P60K60 - the biomass
of nodule bacteria is 418–675 mg plant-1
. The application of N90P60K60 significantly reduces the
number and mass of nodule bacteria - 207–241; N120P60K60 - 32.0–42.0 mg plant-1
, and with the
introduction of P60K60 + N150–180 nodule bacteria are not formed and the effectiveness of
microbiological drugs is not recorded. Nitrogenase activity with N0–90 application on the
background of P60K60 and seed inoculation ranged from 3.25 to 7.76 μmol C2H4 per plant ha-1
.
With a further increase in nitrogen levels, nitrogenase activity was not recorded. On typical
chernozems of the Forest-Steppe of Ukraine, higher yields of early-ripening soybean varieties are
formed by applying N60P60K60 and pre-sowing seeds treatment with rhizohumin or
rhizohumin/hetomics combination. P60K60N150–180 showed a partial decrease in soybean yield due
to the distress effect.
Kirjeldus
Received: May 16th, 2022 ; Accepted: October 13th, 2022 ; Published: November 18th, 2022 ; Correspondence: wisssy6@gmail.com
Märksõnad
hetomic, mineral fertilizers, nodules, rhizohumin, soybean, variety, yield, articles