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我市自然条件较差,90%以上的土地分布在山区和半山区,加上耕作粗放,作物布局不尽合理,中低产田的比例较大。由于土壤长期缺肥,少氮缺磷,物理性质变劣,增施有机肥料不足,致使土壤肥力下降,土地越种越瘦,产量越来越低。为改变这一现状,促进农业增产,本文根据第二次土壤普查汇总的有关资料,对天水市五县两区部分耕地土壤的养分储量和耕层养分进行了数理统计和回归分析,为改造中、低产田提供科学依据。一、土壤肥力现状我市土壤有黑鸡粪土、黄鸡粪土、黄土、傻黄绵土、红土和河淀潮土等7种土壤类型,其中肥力较高的黑鸡粪土和黄土耕层有机质分别为1.30%和1.24%,其它几种土壤有机质均在1%和1%以下;全氯含量在0.064—0.090%之间;速磷含量5.6—9.8ppm;速钾含量
The natural conditions of our city is poor. More than 90% of the land is distributed in the mountainous and semi-mountainous areas. In addition, extensive farming, unreasonable crop layout and large proportion of middle and low-yielding fields. Due to the long-term lack of soil, lack of nitrogen and phosphorus, poor physical properties and lack of organic fertilizers, the soil fertility is reduced and the more lean the land is, the lower the yield is. In order to change this situation and promote agricultural production, according to the second soil census summary of the relevant information on Tianshui City, five counties two parts of the soil nutrient reserves and plow nutrients conducted mathematical statistics and regression analysis for the transformation , Low yield field to provide a scientific basis. First, soil fertility status of the city of black chicken manure soil, yellow chicken manure, loess, silty loess, clay and river soils and other seven soil types, of which black manure and fertile soil topsoil organic matter were 1.30 % And 1.24%, and the content of organic matter in other soils was less than 1% and less than 1%, the total chlorine content was between 0.064 and 0.090%, the content of fast phosphorus was 5.6-9.8ppm,