Influence of the violated irrigation regime on the yield of sudan grass grown as a second culture for the conditions of Southern Bulgaria

Abstract

The aim of the study was to determine the impact of the disturbed irrigation regime on the yield of dry biomass of Sudan, grown as a second crop. During the period 2014-2016 in the experimental field of the Agricultural Institute of Stara Zagora on meadow - cinnamon soil was conducted an experiment with Sudan second crop variety Angers-1. grown after the predecessor barley. In the field experience, the following variants were studied: variant 1 without irrigation (control); variant 2 optimal irrigation 75-80% of FC (100% irrigation rate); variant 3 irrigation as variant 2, but with removal of the first watering; variant 4 irrigation as variant 2, but with removal of the second watering; variant 5 irrigation as variant 2 but with the removal of the third watering. It has been established that the greatest importance for obtaining relatively high yields from Sudan grown as a second crop is the provision of the first watering, applied immediately after its germination. Failure to apply this watering leads to a reduction in yield by 12%-13%. With the correct determination of the moment of watering during the Sudan grass vegetation, good results can be achieved with only two watering.