关键词: 南美白对虾, 南美白对虾, 水质, 养殖密度, 养殖面积, 经济效益

Abstract: In order to investigate the optimum cultivation models of different maize varieties under dry-land conditions in western Shanxi, a field trial with three factors random configuration design was conducted with three maize varieties, four kinds of planting densities and three sowing dates. The differences of agronomic characters and yield under the different experimental conditions were analyzed. The results showed that the maximum leaf area index, grain number per ear, 1000- grain weight, yield of three maize varieties were significantly or extremely significantly influenced, but plant height, height of ear position were not significantly affected by planting density; effects of sowing date on plant height, height of ear position, maximum leaf area index, grain number per ear, 1000-grain weight, yield of three maize varieties were significant or extremely significant; the interaction among agronomic characters influenced the maize yield. Comprehensive analysis showed that the yield of‘Xianyu 335’ and‘Dafeng 30’were 13914.17 kg/hm² and 13487.67 kg/hm² and reached the highest at a density of 67500 plants/hm² and a sowing date of mid-May; the yield of‘Fushengyuan 55’reached the highest of 16114.37 kg/hm² at a density of 75000 plants/hm² and a sowing date of late April. The study could provide a technical support for the three maize varieties to achieve high yield in the region.