论文部分内容阅读
苏南地区传统的水田耕作流程是翻地、晒垡、灌水、施肥、耖耙,因而形成表层软烂、下层为沉实土块的淹水耕层.在冬季旱作期间,稻麦轮作水田土层经受到干湿冻融的交替过程,产生一定的孔隙结构.在适耕的水分条件下,用铧式犁牛耕,不直接震动挤压垡块,通过晒垡、轻耙、灌水后,亚耕层可保持一定的团块.实行双三熟制后,由于季节紧,挤掉了晒垡,麦收后水耕水耙,一般采用旋耕机剧烈搅动,加上双季稻淹水时间延长,粘粒下沉,致使土层内原有孔隙消失,结构破坏,还原性增强,透水性能变差.
The traditional paddy farming system in southern Jiangsu is landfilling, drying, irrigation, fertilizing and raking, thus forming a submerged topsoil with soft soil surface and subsoil soil in the lower layer. The soil is subjected to the alternate process of dry-thaw freeze-thaw, resulting in a certain pore structure.Under the condition of hydration, the plow is plowed with the plowshare and does not vibrate directly to squeeze the pound block. After sunning, light raking and irrigation, Sub-tillage can maintain a certain mass.Effect of Shuangsanhu system, due to the tight season, squeezed out sunburn, wheat harvest after hydroponic water rake, rotary tillage machine commonly used violent agitation, plus double-season rice flooding time Prolonged, clay particles sink, resulting in the disappearance of the original pores in the soil, the destruction of the structure, reduce the enhanced permeability deterioration.