Agricultural Institute, BG - 6000 Stara Zagora, Bulgaria
A. STOYANOVA, A., 2009. Irrigation regime of grain maize. Bulg. J. Agric. Sci., 15: 528-532
Experimental survey was performed during 2003 - 2006 on the experimental field of Agricultural institute, Stara Zagora on soil type leached smolnitza. Influence of irrigation through one and two furrows on the maize grain yield was investigated in the next variants: Irrigation by 800g.kg-1 FWC for the layer 0 - 100 cm; Irrigation through one furrow at M = 500g.kg-1. Irrigation through one furrow at M = 1000g.kg-1; Irrigation through two furrow at M = 500g.kg-1; Irrigation through two furrow at M = 1000g.kg-1. Results from the survey demonstrated that for the condition on soil type leached smolnitza optimal irrigation of maize for grain, realized by supporting of before irrigation moisture 800g.kg-1 FWC supply 7883kg.ha-1 grain. Irrigation of maize in the groove and two furrows, with the same water as in the optimal variant leads to reduction in yield compared to the optimum, by 42g.kg-1 and 139g.kg-1, and to reduce irrigation by 500g.kg-1 rate the reduction in yield was 101g.kg-1 and 187g.kg-1. Upon submission of irrigation water through a groove with the size of the irrigated rate 60 mm, decrease the yield of 20g.kg-1 to 60g.kg-1 compared with variations in each irrigation furrow irrigation at the same rate. The reduction in yield when irrigation with furrow irrigation in normal 30mm versus irrigation in each furrow irrigation with normal 60mm was from 40g.kg-1 to 80g.kg-1. Two irrigation furrows with 60mm irrigation rate resulted in significant reduction of the resulting yield and ranged from 130g.kg-1 to 160 g.kg-1.