土层置换犁改土大面积示范效果

Effect of a Large Area Demonstration of Soil Displacement Plow

黑龙江省是我国农业大省,在农业生产中广泛使用化学农药,然而部分农药残留制约了农作物正常轮作的进行和农业种植结构的调整。根据长残留农药在土壤中空间分布特点,研究了土层置换(表层0～20cm与下层20～40cm的土壤互换)技术的效果。结果表明:土层置换后马铃薯增产51.3%～72.6%,甜菜增产115.4%～129.3%;纯收入增收2 541 083元,增收率达185.5%;土壤物理性质有所改善,降低了土壤容重,提高了土壤持水能力。

Heilongjiang province is a major agricultural province in China, chemical pesticides were used widely in agricultural production. However, part of pesticide residues restricted the normal crop rotation and the im- provement of agricultural planting structure. According to spatial distribution characteristics of long residual pesticides,the effect of soil displacement（0 - 20 cm and the lower surface 20 -- 40 cm of soil exchanging）was studied. The results showed that after soil displacement, potato could increase yield by 51.3-72.6 %, sugarbeet could increase yield by 115.4 - 129.3;The whole net income could increase 2 541 083 Yuan, the increas- ing rate could reach 185.5 %;The soil physical characteristics could be improved, for exaple,it decreased soil bulk density,increased soil water holding capacity.