Fixed nitrogen in agriculture and its role in agrocenoses
Laen...
Kuupäev
2021
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
On typical low-humus black soils in short crop rotations with legumes (25–33%) and
without them, it was found that depending on the set of crops in crop rotation and application of
fertilizer rates, nitrogen yield per crop is from 355 kg ha-1
to 682 kg ha-1
. The recommended
fertilization system provided nitrogen compensation for crop yields by only 31–76%. Hence, in
the plant-fertilizer system nitrogen deficiency varies from 161 to 370 kg ha-1
. The greatest
nitrogen deficiency in the soil is observed in crop rotation without the use of fertilizers with the
following crop rotation: peas-winter wheat-grain maize-spring barley. The main source of
nitrogen for plants is soil nitrogen. In crop rotations with legumes, biological nitrogen is supplied
from the air, which in quantitative terms per rotation in crop rotations with peas is
109–288 kg ha-1
, with soybeans 264–312, and with alfalfa 486 kg ha-1
. Biological nitrogen in
crop rotations with peas and soybeans is reimbursed from 25 to 62%, in crop rotation without
legumes - 9% (non-symbiotic nitrogen fixation), and in crop rotation with alfalfa - 89% of the
total nitrogen removal with the crop.
Kirjeldus
Received: February 23rd, 2021 ; Accepted: May 12th, 2021 ; Published: May 19th, 2021 ; Correspondence: andb201727@ukr.net
Märksõnad
biological nitrogen, legumes, nitrogen balance, nitrogen fixation, short crop rotations, articles