The influence of agrometeorological factors on the duration of vegetation and the yield of the green mass of the Sudanese grass Zemlyachka line

Abstract

Relevance. In modern realities, reliable sources of cheap and high-quality feed are needed. Changing weather conditions  have  a  great  impact  on  crop  yields.  The  paper  analyzes  the  influence  of  the  weather  conditions  of the region on the introduced Sudanese grass of the Zemlyachka line.Results. As a result of the studies, the average duration of interphase periods in the Sudanese grass Zemlyachka line was established, correlations of the duration of interphase periods on the sum of active temperatures,  precipitation  and  hydrothermal  coefficient  are  found.  It  has  been  established  that  at  the  initial  stage, high  amounts  of  active  temperatures  are  vital  for  the  development  of  the  Sudanese  grass  of  the  Zemlyachka, and the presence or absence of precipitation during this period does not significantly affect the duration of   the phases. Low average daily temperatures lead to an increase in the duration of interphase periods, as well as to an increase in the sum of the active temperatures of the periods. An increase in precipitation at the middle  stage  of  ontogenesis  leads  to  its  elongation.  A  close  correlation  has  been  established  between  the yield of  green mass and the sum of active temperatures during the periods “sowing — shoots” (r. = 0.8) and “shoots   — exit into the tube” (r = 0.77), as well as on the duration of the period “shoots — entry into the tube” (r  =  0.93).  The  average  yield  of  green  mass  over  the  years  of  research  was  46.2  t/ha,  the  Sudanese  grass  Zemlyachka  is  a  good  source  of  feed.  The  life  cycle  of  a  culture  in  the  conditions  of  the  region  remains,  as  a rule, unfinished, seeds must be purchased from producers from the southern regions.