THE EFFECT OF INTERMEDIATE SOWING OF FODDER CROPS ON SOIL FERTILITY OF IRRIGATED SOILS IN AZERBAIJAN
Abstract
Results are given from studies on the influence of intermediate sowing of fodder crops in different variants on main soil fertility indices (humus, biological activity, water-physical status) of irrigated gray-brown soils of the arid zone of the Kur-Araz Lowlands in Azerbaijan. The optimal variant was selected, that was: winter rye + vetch + rapeseed for green mass (first harvest), then maize + soybean + sorghum + amaranth for silage (second harvest), and then barley + vetch for green mass (third harvest). It was found that soil-climatic conditions in this zone allowed obtaining three harvests of green mass (1555.02 centners per ha) under irrigation, and accumulating 196.9 centners of dry crop residues in the 0–50 cm soil layer. With that, 6438.65 kg of carbon, 313.07 kg of nitrogen, 157.52 kg of phosphorus and 417.37 kg of potassium entered the 0–50 cm layer of irrigated gray-brown soil along with stubble and root residues. This contributed to the intensification of biological activity of soil (the total number of microorganisms in the 0–25 cm soil layer increased to 19×106–21×106 CFU/g of soil), and to the annual increase of newly formed humus from crop residues by 0.02–0.07 percent. When obtaining three harvests a year, the humus content in the 0–50 cm soil layer increased to 3.08 percent, and humus reserves increased to 184.48 tons per ha; volume weight reduced to 1.04–1.15 g/cm3; specific weightimproved to 2.62–2.64 g/cm3; total porosity and water permeability increased to 56.0–53.0 percent and 2.2–1.9 mm/min, respectively.
About the Author
F. M. RAMAZANOVA
Institute of Soil Science and Agrochemistry, Azerbaijan National Academy of Sciences
Azerbaijan
Azerbaijan
5, Mameda Ragima St, Baku, Azerbaijan, 1073
Candidate of Science in Agriculture, Lead ResearcherReferences
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Review
For citations:
RAMAZANOVA F.M. THE EFFECT OF INTERMEDIATE SOWING OF FODDER CROPS ON SOIL FERTILITY OF IRRIGATED SOILS IN AZERBAIJAN. Siberian Herald of Agricultural Science. 2017;47(4):103-109. (In Russ.)
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