TY  - JA
AU  - Grzebisz,W.
AU  - Jaworski,R.
TI  - Influence of crop rotation and irrigation on properties of soil humus substances
SN  - 0079-2985
U1  - 89-140696 
PY  - 1987///
KW  - Chemical composition
KW  - Cropping patterns
KW  - Cropping patterns and systems
KW  - Crops
KW  - AGROVOC
KW  - Cultivation
KW  - Eastern Europe
KW  - Economic plants
KW  - Elements
KW  - Europe
KW  - Fertilizers
KW  - Grain crops
KW  - Irrigation
KW  - Methods
KW  - Nonmetals
KW  - Organic matter
KW  - Plants
KW  - Soil amendments
KW  - Soil biology
N1  - 4 tables; 14 ref. Summary (Pl)
N2  - When cereals were increased to 75 percent of the rotated crops there was a decrease in the amount of total carbon in the soil and an increase in the content of mobile humus fractions. Those adverse effects were alleviated by correct nitrogen fertilization and manuring
T2  - Polish Journal of Soil Science
ER  -