STUDY ON MAIZE GENOTYPE SCREENING BY GROW OUT TEST

Abstract

An experiment was conducted during the period from April to July 2019 in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to evaluate the genetical purity, growth and yield performance of maize (Zea mays L.). The experiment comprised of single factor with 12 maize genotypes. Among the maize genotypes, there were 11 maize varieties and 1 maize line. The varieties were namely SAU Hybrid Vutta-1, SAU Hybrid Vutta-2, Pioneer-3355, Pacific-339, Pacific-224, Nyx7055, Pacific-999, DK-Evarest, DK-971, Arize super and Kaveri 50. The advance line was

namely

A-0078. The experiment was laid out in Randomized Complete Block design (RCBD) with three replications. Different hybrids maize varieties and maize lines showed significant effect on growth, yield and yield contributing characters. Pacific-999 took the maximum days for 80% germination, 80% flowering and 80% cob formation (6.67, 54.00 and 72.00 days, respectively) whereas, the minimum days (4.00, 49.00 and 59.00 days, respectively) was taken by Nyx-7055.A-0078 maize line showed the tallest plant (106.53 and 234.67 cm at 45 DAS and harvest, respectively) whereas and SAU Hybrid Vutta-2 showed the shortest plant (77.77 and 192.00 cm at 45 DAS and harvest, respectively). Nyx-7055 showed the highest genetic purity (100.00 %), whereas SAU Hybrid Vutta-2 showed the lowest genetic purity (97.22%). The maximum cob length (30.51 cm) was observed from Pioneer-3355. The lowest length of cob (15.24 cm) was recorded from Arize super. The highest cob circumference (17.73 cm) was recorded in DK-971, while the lowest ones (11.97 cm) was recorded in Arize super. The highest full cob weight (252.13 g) was recorded from Kaveri-50 variety, whereas the lowest ones (117.78 g) was recorded from Arize super variety. Nyx-7055 maize variety showed the maximum no. of rows cob -1 (16.00) and no. of grains row -1 (35.33). The maximum 100-seed weight (41.90 g) was found from Pacific-999 variety and SAU Hybrid Vutta-2 variety showed the minimum 100-seed weight (31.67 g). Among the varieties, Nyx-7055 showed the highest grain yield (13.96 t ha -1 ), stover yield (15.98 t ha -1 ) and biological yield (29.94 t ha ), whereas Arize super showed the lowest grain yield (9.04 t ha -1 ), stover yield (10.20 t ha ) and biological yield (19.24 t ha -1 ). DK-Evarest maize variety showed the maximum harvest index (47.36 %), whereas Kaveri-50 maize variety showed the minimum harvest index (46.30 %). By conducting research experiment it was found that, Nyx-7055 was performed well among the 12 varieties of maize.