Screening experiment on superior fresh corn varieties in northwest of Guizhou Province

In order to screen superior fresh corn varieties in northwest of Guizhou Province, 10 varieties were collected for experiments．Growth period, plant characteristics, agronomic traits, photosynthetic rate, and yield of each variety were investigated．Growth period of 10 fresh corn varieties was between 112 and 138 days, with Yueduocaixiannuo having the shortest growth period of 112 days; Yuetian328 has the longest growth period of 138 days．Under a given light intensity of 1250 lx, Yuetian168 had the highest photosynthetic rate of （31.88±0.85） μmol/（m²·s）, followed by Yuetian328 of （29.63±0.36） μmol/（m²·s）．Photosynthetic rate ranking of each tested variety was: Yuetian168 > Yuetian328 > Yuetian415 > Yuetian41 > Yuebainuo6 > Yuecainuo2 > Yueduocaixiannuo > Yuebaitiannuo10 > Yuebaitiannuo7 > Yuebaitiannuo168．Yuetian168 had the highest yield of13888.05 kg/hm², followed by Yuetian328 of 12878.40 kg/hm²．Yield ranking of each tested variety was: Yuetian168 > Yuetian328 > Yuebainuo6 > Yuetian415 > Yuetian41 > Yuebaitiannuo10 > Yueduocaixiannuo > Yuebaitiannuo168 > Yuecainuo2 > Yuebaitiannuo7．Results indicated that Yuetian168 and Yuetian328 have beautiful ears, fast photosynthetic rates, higher yields, and better overall traits．They can be promoted as high-quality and high-yield fresh corn varieties in similar climatic regions．