桂林市水稻土养分状况研究

A Study on the Nutrient Conditions of Paddy Soil in Guilin City

为了解桂林市水稻土养分现状 ,为全市土壤诊断施肥提供科学依据 ,1 998年秋收后 ,我们对全市稻田进行了取样化验 ,共采集土壤农化样 3536个 ,经化验与第二次土壤普查时的养分状况相比较 ,结果表明 :土壤有机质、全氮呈上升趋势 ;土壤速效磷无明显变化、速效钾略有下降;土壤PH值呈下降趋势。本文对这些化验结果进行了比较分析和研究 。

For the purpose of understanding the present nutrient conditions of the paddy soil in Guilin City so that the scientific basis could be provided to the fertilizer application after soil diagnosis,the author carried out soil sample analysis for all paddy fields in Guilin City after the Autumn harvest in 1998.The total number of soil agro-chemical samples was 3536.After analysis and comparing with the nutrient conditions in the second general survey of soil,the result showed that:Soil organic matter and soil total nitrogen tended to increase ;soil rapidly available phosphorus did not change obviously ;rapidly available potassium decreased a little bit ;soil PH value tended to decrease.In this article,the above mentioned results had been compared,analysed and studied in order to provide the scientific basis for soil fertility culture and reasonable fertilizer application.