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三、盐分逆境:我省盐碱地约500万亩,占全省耕地面积的4.7%.其特点:一是土壤表层(0-10厘米上下)积盐量较高,一般耕层含盐量,最轻0.2%以下,轻度盐碱地为0.3%左右,中度盐碱地为0.5%左右,重度盐碱地为0.6%左右,最重达1%以上;二是有明显的季节性变化,旱季为积盐期,湿季为脱盐期;三是多呈花斑状分布,大体上背河洼地多呈条带状,丘间洼地和平沙地多呈斑状.盐碱对作物危害很大,一般轻度盐碱
Third, salt adversity: about 5000000 acres of saline land in our province, accounting for 4.7% of the province’s arable land.Its characteristics: First, the soil surface (0-10 cm up and down) higher salt content, general topsoil salinity, the most Light 0.2% or less, slightly saline-alkali soil is about 0.3%, moderate saline-alkali soil is about 0.5%, severe saline-alkali soil is about 0.6% and the heaviest weight is more than 1%; secondly, there are obvious seasonal changes, The wet season is the desalination period, the third is mostly piebald-shaped distribution, in general, the river is mostly strip-shaped depressions, mound depressions and flat sand mostly spotted salt is harmful to crops, generally mild saline