沼液灌溉对紫色土-水稻系统的影响研究

Effect of Biogas Slurry Irrigation on Purple Soil System for Rice Planting

文章采用盆栽试验,研究了不同沼液灌溉强度下对紫色土-水稻系统的影响。结果表明:在一定范围内,稻米产量随着沼液灌溉强度的增大而增加,最高增产115.82%;稻米内重金属含量未超过相关标准;土壤pH值提高,能防止土壤酸化;有机质、总氮和总磷含量分别增长8.84%～41.40%,23.6%～104.2%和19.3%～39.8%;并且土壤中Cu,Zn,Pb,Cd和As含量未出现明显积累。综合水稻产量、安全性及土壤养分和重金属含量各因素,水稻单季沼液灌溉量(折算为大田灌溉量)不超过2970 m3·hm-2为宜,对环境污染风险小。

Pot experiment was conducted to study the effect of biogas slurry irrigation on purple soil system planting rice. The results showed that the rice production increased with increase of biogas slurry irrigation in a certain range comparing with the common water irrigation. The highest yield had a increment of 115.82%. Heavy metal content of the rice was low- er than the standard limit. And biogas slurry irrigation could prevent soil acidification. The organic matter content in soil was increased by 8.84% -41.40%, TN increased by 23.6% -104.2%, and TP 19.3% - 39.8%. The Cu, Zn, Pb, Cd and As contents in soil did not appear obvious accumulation. Consider of rice production, safety, soil nutrient and heavy metal content, it is advisable that biogas slurry irrigation amount does not exceed 2970 m3 hm-2 for a season of rice.