Capacity of spring barley in long-term application of fertilizers in field crop rotation

Abstract

The impact of long-term application of different rates of fertilizers and fertilizer systems in field crop rotation as well as other factors on capacity of spring barley is analyzed. A strong effect of the change of characteristics of soil fertility under the influence of fertilization and crop rotation on the level and dynamics of capacity of spring barley is grounded. Main linear models of fertilizer effects during different testing periods on capacity of spring barley are developed on grounds of researches. Mathematical data analysis of capacity of spring barley in different variants of fertilization showed that low rates of fertilizers (N45P45K45) didn’t keep capacity on the fixed level though it was higher than in the non-fertilized plots. High rates of fertilizers in time showed decrease in the annual average crop capacity that is primarily accounted for concentration of abile soil nutrients in soil and optimal nutrition of crops. That is the nutritive regime of soil is no more the limitative factor of crop capacity of spring barley. Further increase in capacity is possible due to such factor as a cultivar.