编者按：国外研究认为无机肥及农药，对人体健康十分不利，因而倡导实施有机栽培技术。美国现已有十分之一的农田采用有机栽培技术，日本亦正在普及有机栽培技术。本文提倡改土，有着良好的现实意义。土壤“浅薄、板结、瘠瘦”，是南方红壤型中低产田和荒地开发治理中的主要障 Editor’s Note: Foreign studies that inorganic fertilizers and pesticides, very unfavorable to human health, which advocated the implementation of organic cultivation techniques. One-tenth of farmland in the United States now uses organic cultivation techniques and Japan is also popularizing organic cultivation techniques. This article advocates soil improvement, has a good practical significance. Soil “shallow, flat knot, barren lean”, is the red soil in the southern middle and low yield fields and wasteland development and management of the main barrier