Efficiency of application of liquid complex fertilizers under sunflower on black soil of the Krasnodar region

We studied efficiency of application of liquid complex fertilizers (mark 10-34-0) under sunflower on leached black soil of the Krasnodar region in 1984-1987. The researches were conducted in laboratory and fields of the V.S. Pustovoit All-Russian Research Institute of Oil Crops (Krasnodar). Obtained results showed liquid complex fertilizers causes more favorable phosphorus regime in soil compering to application of dry fertilizers. Liquid complex fertilizers in doses more than N40P60 containing nitrogen, applied jointly with sunflower seeds during planting, negatively influenced on seeds germinating ability. Usage of ammonia nitrate had the strongest negative effect on seeds germination. Mixture of ammonia nitrate and carbamide influence less and the lowest effect on seeds germination application only carbamide showed. Due to agronomist opinion, a mixture of ammonia nitrate and carbamide appeared to be the best nitrogen component to level N : P rate till optimal (1 : 1...