河套灌区不同盐分含量土壤对向日葵生长的影响

Effects on Growth of Sunflower Under Different Saline Soils in the Hetao Irrigation Area

通过对河套灌区不同盐渍化土壤进行的田间试验 ,分析了在不同生育阶段盐分水平对向日葵生长和产量的影响。可知向日葵各个生育阶段对盐分的反应并不相同。苗期对盐分较敏感 ,作物各生育指标对盐分的响应很大。现蕾期土壤中适量含盐 ,作物对苗期受盐分影响有补偿性生长。全生育期土壤盐分含量高于 5mg·g-1时 ,严重抑制作物生长 ,最高减产率可达 4 5 5 2 %。

Field experiments were carried out to study the effects of different saline soils on growth process and yield of sunflower in the Hetao irrigation area.The results indicated that sunflower had different responses to salt content during different growth stages. Sunflower is sensitive to salt in seeding stage, the physiological indexes of crop are respondent to salt obviously.Salt tolerance increass during squaring period, compensate growth occurs for the salt stress in seedling period.If salt content is exceeding 5mg·g^(-1) in the whole growth period, it will restrain growth of sunflower and may decrease yield of 45.52%.