Issues:
Sections:
Issue 94
GENERAL BIOLOGY
UDK: 631.416.1; 631.417.4
NITROGEN FUND OF AGRO-CHERNOZEM (BLACK SOILS) IN THE KANSK FOREST-STEPPE
KURACHENKO Natalya L.,
KASANOVA Ekaterina Yu.
The paper presents the results of studying the nitrogen fund of agrochernozems of the Kansk forest-steppe located in the eastern part of the agricultural zone of the Krasnoyarsk Territory. The object of the study are the agro-chernozems which are the basis of the arable fund of the region. It is shown that the soils functioning in agrocenoses are characterized by a high content of humus and the total nitrogen, decreasing in the series of the agrochernozem subtypes: clay-illuvial podzolized - clay-illuvial typical - cryogenic-mycelial. The bigger part of the nitrogen compounds in the soils is represented by non-hydrolyzable nitrogen (88-97%). The share of hardly hydrolyzable nitrogen accounts for 7-8%, easily hydrolyzable nitrogen - 2-4%, mineral - 1% of the total nitrogen reserves. The reserves of the non-hydrolyzable nitrogen in the meter-thick soil layer gradually decrease in a series of the agrochernozem subtypes from 24,7 to 9,9 t/ha, and of hardly hydrolyzable nitrogen from 1,9 to 0,9 t/ha. Narrower ranges of fluctuations are revealed for the reserves of the easily hydrolyzable nitrogen. In the 0-100 cm layer, they are estimated at 0,5-0,6 t/ha. The reserves of the ammonium nitrogen in the agrochernozems are at 0,12-0,07 t/ha with a maximum characteristic of the clay-illuvial podzolized agrochernozems. The subtypes of the agrochernozems do not differ significantly in the reserves of the nitrate nitrogen. In the 0-20 cm layer, they are 0,01 t/ha, 0-100 cm - 0,02 t/ha.
Pages: 52 - 58
Date: 15.11.2024