我国梨产区灌溉水pH及矿质营养元素分析

为研究我国梨产区灌溉水矿质元素含量,以国家梨产业技术体系14个试验站78个灌溉水样品为试材,测定了pH、NH_4~+、NO_2~-、NO_3~-、PO_4~(3-)、K~+、Ca~(2+)、Mg~(2+)、SO_4~(2-)、Fe、Mn、Cu、Zn和B的含量,并对其分布规律及相关性进行了分析。结果表明,灌溉水pH平均值为7.74,pH大于7.5以上碱性水占供试样品的75.64%。参照GB5084-2005对农田灌溉水质的规定,灌溉水pH有4个样品不符合要求;在选择性控制项目中,灌溉水B含量有5个样品不符合要求。灌溉水中pH值与Cu呈极显著负相关。NO_3~-与Ca~(2+);K~+与Ca~(2+)、Mg~(2+)、SO_4~(2-);Ca~(2+)与Mg~(2+)、SO_4~(2-);Mg~(2+)与SO_4~(2-)都呈极显著正相关。

Analysis of pH and mineral elements in the irrigation water in the pear-producing area in China

In order to study the content of mineral elements in the irrigation water in the pear-producing area in China, 78 irrigation water samples from 14 Experiment Stations of China Pear Research System (ESCPRS) were collected. The pH, NH₄⁺, NO₂^-, NO₃^-, PO₄^3-, K⁺, Ca²⁺, Mg²⁺, SO₄^2-, Fe, Mn, Cu, Zn and B of these samples were measured, and pH distribution and correlation between mineral elements were analyzed. The results showed that the average pH value of the irrigation water was 7.74, and the alkaline water with pH value above 7.5 accounted for 75.64% of the selected samples. According to the regulations of GB5084-2005 on the water quality of farmland irrigation, four samples did not meet pH requirement; in selective-control projects, five samples did not meet B requirement. The pH value was significantly negatively correlated with Cu. The NO₃^- and Ca²⁺; the K⁺ and Ca²⁺, Mg²⁺, SO₄^2-; the Ca²⁺ and Mg²⁺, SO₄^2-; the Mg²⁺ and SO₄^2- in the irrigation water all had a highly significantly positive correlation.