大量的事实业已证明,水稻从地理位置、气候条件不同或地理位置、气候条件基本相同而土壤质地、耕作栽培条件不相同的地区换种栽培,能获得明显的增产效果。我国农民历来就有异地换种的习惯。但是,对水稻异地换种栽培增产效果的大小及其持续时间与地理距离等,未曾有人研究。近4年 A large number of facts have proved that rice can be obviously cultivated in different areas with different geographical locations, different climatic conditions or geographic locations, similar climatic conditions and different soil textures and tillage and cultivation conditions. Farmers in our country have always had the habit of changing their habitats. However, no studies have been conducted on the effects of increasing yield of replanting rice in different places, its duration and geographical distance. Nearly 4 years