|
2016, N 1 (23) |
|
ECOLOGY |
|
Morev D., Vasenev I. |
|
|
Land agroecological assessment in conditions of soil cover increased diversity of the Vladimir Opolye |
|
|
Land agroecological assessment has been done for two representative field agroecosystems of the Vladimir and Yaroslavl regions with high diversity of grey forest soils and sod-podzoluvisols, including identification of their principal agroecological factors limiting the crop yield. Gray forest soils have been studied in the experimental field of Vladimir research agricultural institute on the gentle slope of Western exposition with steepness up to 3° and spring wheat varieties "Sudarinya". Sod-podzoluvisols have been studied in JSC "Druzhba" (Pereslavl district of the Yaroslavl region) on two opposite slopes with winter rye "Moscowskaya 12": one slope of Northern exposure with steepness 1-3° and another one of Southern exposition with steepness 3-5°. On each field there were examined ten elementary key plots with soil analysis and investigation of weedness and crop biometric indicators, including the assessment of biological productivity in the fourfold repetition at the sites of 0.25 m2. Studies have shown a significant (more than 2-fold) within-field variability in the investigated crop yield in case of both representative agroecosystems. In case of more "rich" agroecosystems with the loamy gray forest soils the principal limiting factors were soil bulk density (R=0,72) and soil gley process which can be quantitatively indicated by the depth of second humic horizon (R=-0.52), reflecting within-soil microrelief. In case of relatively "poor" light loam sod-podzoluvisols the principal limiting factor was the content of mobile forms of potassium (R=0,88), which qualitatively distinguishes these soils from the earlier considered gray forest soils and identifies the priority actions to enhance their real fertility. Identified regularities in the increased spatial differentiation of the investigated land agroecological quality actualize the issues of their system analysis for the applied technologies agroecological optimization with minimizing the major environmental and economic risks of agricultural production in conditions of the typical for Central region of Russia increased soil cover variability.
|