盆栽花卉回流水EC值与养分含量相关性研究

Study on Correlation Between EC Value and Nutrient Content in Backwater of Potted Flowers

为提高红塔区盆栽花卉回流水的利用率,摸索水肥一体化配肥的有效途径,在3个盆栽花卉种植企业,定点定期采集灌溉水水样42个、回流水水样85个,对p H、EC值、有效氮等7项养分指标进行检测,分析回流水EC值与养分含量的相关性。结果表明:(1)盆栽花卉灌溉水EC值含量在82.10~2170.00μs/cm之间,平均544.40μs/cm,变异系数119.42%。(2)盆栽花卉回流水EC值在85.00~2960.00μs/cm之间,平均1115.99μs/cm,95%置信区为980.65~1251.33μs/cm。(3)与灌溉水比,回流水EC值增加571.58μs/cm、有效氮增加362.43 mg/L、有效磷增加102.81 mg/L、有效钾增加50.93 mg/L、有效硫增加27.73 mg/L、交换性镁增加15.59 mg/L,表明回流水中有效氮、有效磷、有效钾、有效硫、交换性镁有大量残留,有较大的利用空间。(4)回流水EC值与有效氮、有效磷、有效钾、交换性镁、有效硫5个养分含量有正相关关系,均达显著水平。红塔区盆栽花卉生产中,在利用回流水时可以通过测定EC值,快速得出回流水中有效氮、有效磷、有效钾、有效硫、交换性镁的含量,及时指导盆栽花卉配肥。

In order to improve the utilization rate of recycled water for potted flowers in Hongta District and explore effective ways of integrated fertilization,42 irrigation water samples and 85 backflow water samples were collected regularly from 3 potted flower planting enterprises.Seven nutrient indicators,such us pH value,EC value,and available nitrogen,were tested to analyze the correlation between backflow water EC value and nutrient content.The results showed that:(1)the EC value of irrigation water for potted flowers ranged from 82.10 to 2170.00µs/cm,with an average of 544.40µs/cm and a coefficient of variation of 119.42%.(2)The EC value of the backflow of potted flowers ranged from 85.00 to 2960.00µs/cm,with an average of 1115.99µs/cm and a 95%confidence zone of 980.65 to 1251.33µs/cm.(3)Compared with irrigation water,the EC value of return water increased by 571.58µs/cm,the available nitrogen increased by 362.43 mg/L,the available phosphorus increased by 102.81 mg/L,the available potassium increased by 50.93 mg/L,the available sulfur increased by 27.73 mg/L,and the exchangeable magnesium increased by 15.59 mg/L.This indicates that there is a large amount of residual available nitrogen,available phosphorus,available potassium,available sulfur,and exchangeable magnesium in the return water,and there is a great potential for utilization.(4)The EC value of the return water was positively correlated with the content of five nutrients,including available nitrogen,available phosphorus,available potassium,exchangeable magnesium,and available sulfur,all of which were above a significant level.Therefore,in the production of potted flowers in Hongta district,the content of available nitrogen,available phosphorus,available potassium,available sulfur,and exchangeable magnesium in the recycled water can be quickly determined by measuring the EC value when using the recycled water,and timely guidance can be provided for the fertilization of potted flowers.