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为了掌握土壤肥力变化情况及指导施肥,自一九八四年,我们在全县范围内设立了179个定位监测点,坚持每年对全县土壤养分实行定点监测。十年来,共化验上样1289个,总计4546项次,包括全县砂土、淤土、两合土、盐化潮土、黑老土五大土属,二十二个土种,代表面积占全县总耕地面积的99.30％。十年连续的定点监测结果统计表明:全县农田土壤有机质呈上升趋势,碱解氮上下波动,无太大变化,速效磷一直上升,近二年又呈下降趋势,速效钾则呈明显的下降趋势。
In order to grasp the changes of soil fertility and to guide the application of fertilizers, since 1984, we have set up 179 positioning monitoring points throughout the county and insisted on annual site-specific monitoring of soil nutrients throughout the county. Over the past decade, a total of 1289 samples were tested for a total of 4546 sub-projects, including sand, silt, two-loam soil, salinized alluvial soil and black-Lao soil in the county. Twenty-two soil types represent the total area The county arable land area of 99.30%. Ten years of continuous monitoring results show that the fixed point: the soil organic matter in farmland of the county is on the rise, the fluctuation of alkali-grade nitrogen does not change much, the available phosphorus increases continuously, decreases again in the past two years, and the available potassium decreases obviously trend.