Effects of SeleniumFertilizers on SeleniumContent and Nutrient Quality of Kiwifruit

The effects of different fertilization methods on selenium content and nutrition quality of kiwifruits were employed for selenium fortification. The fertilization methods were root fertilization, foliar fertilization and combined fertilization on their corresponding fertilizing periods. The results demonstrated that selenium content of these three experimental groups was in the order of foliar fertilization>combined fertilization>root fertilization. Foliar fertilization with the dose of 0.5 kg was optimal, whose selenium content of kiwifruits increased by 103.5%. The vitamin C content of these three experimental groups was in the order of root fertilization>combined fertilization>foliar fertilization. Root fertilization with the dose of 0.5 kg was optimal, whose vitamin C content increased by 23%. However, the vitamin C content decreased as a result of foliar fertilization. The soluble solid content of these three experimental groups was in the order of foliar fertilization>combined fertilization>root fertilization. Foliar fertilization with the dose of 0.5 kg was optimal, whose the soluble solid content increased by 37.2%. Taking selenium content, nutrition quality, growth of plants and management costs of orchard into account, root fertilization at blossoming leaf stage with the dose of 0.5 kg selenium fertilizers was choosed as the optimal seleniumfortification technology.