Effects of Sewage Sludge and Basic Soil Cultivation Techniques on the Moisture Reserve Dynamics and Productivity and Quality of Carthamus Tinctorius Seeds
2021
Mezhevova, A. S.
The purpose of this study was to examine the effects of sewage sludge and basic tillage techniques on the moisture reserve dynamics and productivity and quality of safflower (Carthamus tinctorius) seeds. The works were performed in 2016–2018 in Volgograd oblast; the Alexandrit variety of safflower was cultivated in a light chestnut solonetzic heavy loamy soil with a humus content of 1.7–1.8%. Sludge produced in the course of biological wastewater treatment features a high content of organic matter and nutrients. The two-factor field experiment involved the moldboard, disk, and chisel cultivation techniques in combination with sewage sludge application at doses of 0, 5, and 10 t/ha. The use of sewage sludge as an organic fertilizer at a dose of 5 t/ha in combination with chisel plowing increases the productive moisture reserves to 82.1 mm and to 88.5 mm at a dose of 10 t/ha. Chisel plowing ensures the highest yields of the studied crop: 142 t/ha at a sewage sludge dose of 5 and 1.51 t/ha at a sewage sludge dose of 10 t/ha. The highest fat content (25.2%) was registered in safflower seeds at a sludge dose of 10 t/ha. The zinc content in safflower seeds was 21.78 mg/kg at a sewage sludge dose of 5 t/ha and 25.08 mg/kg at a sewage sludge dose of 10 t/ha, the copper content was 11.32 and 12.12 mg/kg, and the cadmium content was 0.09 and 0.1 mg/kg, respectively.
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