Evaluating the performance of introduced varieties of maize under different planting dates and environments (some genetic parameters (LAI, TDM, DTM, CGR )

Abstract

"To evaluate the performance of introduced varieties of maize under different sowing dates and locations, in addition to local variety, a field experiment was carried out in two locations; the first fields was at the College of Agricultural Engineering Sciences Baghdad University Al-Jadriya and the second location was at Diyala Governorate Muqdadiya District, fields of the Diyala Governorate Agriculture Directorate, for the fall season 2019. The study compared five varieties of maize introduced from America with a local synthetic variety (Ibba 5018) and tested it in two locations at three sowing dates (1, 15 July and 1 August). The Randomized Complete Block Design RCBD was used with four replications, with spilt plot arrangements, the main plots included three sowing dates, the secondary plots included, the varieties. The traits of leaf area index, total dry matter weight, the number of days to Physiological maturity, crop growth rate, and individual plant yield were studied.The results showed that the date of August 1 exceeded at the Baghdad location with the most studied traits, such as the number of days to physiological maturity (87.50 days) and plant yield (213.7 g), while the second date for the same location exceeded some traits such as leaf area index (4.81) and dry matter weight (421.7 g) and the crop growth rate is 4.715 gm plant-1,day-1.As for Diyala, the second date exceeded as the plant yield (182 g).Results showed the superiority of cultivar 3 for most of the traits in the Baghdad location, such as the weight of dry matter (459 g) and crop growth rate (5.2 gm plant-1 day-1 ),and plant yield (204 g). It also cultivar 3 in Diyala with the highest yield of plant (188.5 g) as a result of its superiority in terms of dry weight and crop growth rate. In the Cumulated analysis, the difference between the two locations was insignificant, whereas in the dates, the two dates were superiored in (July 15 and August 1) the highest yield for plant (182.2 and 187.3 g). Interaction was significant between sowing dates and locations(L×D), sowing dates and varieties (D×V), between varieties and locations(L×V), and the triple interaction of most of the studied traits(L×D×V)"