APPLICATION OF YARA N-TESTER AS AN INSTRUMENT OF RUNTIME DIAGNOSTICS OF NITROGENOUS NUTRITION FOR SPRING SOWN CEREAL

The article presents the data of photometric diagnostics of spring sown cereal by the portable device Yara N-tester at the increasing doses of nitrogen fertilizers under the controlled conditions of greenhouse trial. Close correlation relationship (r=0.91-0.88) between indications and the content of nitrogen in plants at all observation phases is noted. The opportunity of usage of the device as a field instrument of runtime diagnostics of nitrogenous nutrition for spring sown cereal is presented.