【摘要】 回归分析表明,天津市土壤全锌、阳离子代换总量和pH值是影响土壤有效锌含量的重要元素。其中,全锌与有效锌呈正相关,pH值和阳离子代换总量与有效锌呈负相关。黄庄洼土壤富含铁氧化物,阳离子代换总量相对较高,对锌形成束缚。另外,土壤pH值偏高,降低了锌的有效性,因而土壤有效锌常常呈现亏缺状态。在该区进行的水稻补锌试验表明,补锌可显著提高产量,改善品质。更多还原

【Abstract】 Regress analysis shows that the available Zn content of soil in Tianjin is influenced mainly by the total zinc content of soil, pH and CEC. And there is positive correlation between the available zinc content and the total zinc content, and negative correlation between the available zinc content or pH value and CEC. The results of soil investigation indicate that the soil in Huangzhuangwa rich in ferruginous oxide and higher CEC results in the limitation of the available Zn. In addition, the higher pH value decreased the efficiency of the available Zn, and thus results in the shortage of the available Zn of soil. Field experiments showed that the balanced fertilization with adding Zn fertilizer increased the rice yield by 20.8% and also improved the quality clearly.更多还原