Uticaj toplotnih uslova na klijavost semena kukuruza šećerca

This paper deals with effect of two temperature regimes on two seed fractions (flat and round) and four fractions of seed size (small, medium small, medium large and large) of two sweet corn hybrids, ZP SC 401su and ZP SC 504su. Following morphological physiological characteristics, i.e. dry seed before germination (m0), whole dry seed after germination (ms), dry endosperm after germination (me), dry seedling after germination and dry weight loss during the germination and total germination were determined before germination on different temperatures t1-20/30oC (16/8 h) and t2-10oC (eight days). Results show that seeds of different fractions had different germination speed under different temperature regime. In addition, hybrids were also affected by modified temperature conditions. According to these findings, a dynamic of successive sweet corn sowing could be determined.U radu je proučavan uticaj dve temperaturne vrednosti na klijavost dve frakcije (pljosnato i okruglo) i četiri veličine semena (sitno, srednje-sitno, srednje-krupno i krupno) dva hibrida kukuruza šećerca, ZP SC 401su i ZPSC 504su. Pre ispitivanja klijavosti na temperaturnim vrednostima t1-20/300C (naizmenično 16/8 časova) i t2-100Cconst (osam dana) određene su mu sledeće morfološko-fiziološke osobine: suvo seme pre klijanja (m0), suvo celo seme posle klijanja (ms), suvi endosperm posle klijanja (me), suva klica posle klijanja (mk) i gubitak suve mase pri klijanju (Δm) i ukupna klijavost. Dobijeni rezultati pokazuju da semena različitih frakcija različito reaguju brzinom klijanja u izmenjenim toplotnim uslovima. Pored toga, i hibridi su, takođe, različito reagovali na pojedine toplotne tretmane. Na osnovu ovih saznanja može se odrediti i dinamika sukcesivne setve kukuruza šećerca