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

Rumen Bazitov

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.

Keywords: irrigation norms; irrigation regime; sudan grass; yield

Date published: 2021-11-24