| Effects of different fertilizers on the spatial-te mporal variations of soil nitrate |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2007.06.34 |
| Key Words: different fertilizer NO-3-N spatial-temporal variation |
| Author Name | Affiliation | | XIONG Shu-ping | College of Agronomy He’nan Agricultural University,Zhengzhou, He’nan 450002,China | | JI Xing-jie | College of Agronomy He’nan Agricultural University,Zhengzhou, He’nan 450002,China | | ZHAO Qiao-mei | Agriculture Administration of Xuchang City, Xuchang, He’nan,461000,China | | MA Xin-ming | College of Agronomy He’nan Agricultural University,Zhengzhou, He’nan 450002,China |
|
| Hits: 66 |
| Download times: 74 |
| Abstract: |
| The effects of different fertilizers on the Temporal-spatial variations of soil nitrate are studied by virtue of soil column methods.The results show that the max value of nitrate content occurs approximately during grain filling stage,the min value of nitrate content occurs approximately during flowering stage in different depth of soil under different fertilizers.Nitrate contents in different depth of soil are the highest during jointing stage and take second place during over-winter stage without exception.Nitrate contents are highest in the soil layer of 0～20 cm in different depth of soil,the contents of nitrate decrease with the increasing depth of soil layer.Nitrate contents of the mixed fertilizer treatment in the soil layer of 0～20 cm during all the growth stages without exception are the highest except the active grain filling stage and mature stage,while nitrate contents in the soil layer of 40～120 cm in different treatments don't have obvious laws.Nitrate accumulates mostly in the soil layer of 0～40 cm and less in deep soil layers.Nitrate contents in the soil layer of 0～20 cm and 20～40cm each take possession of the total nitrate contents in the total soil of 1.2 m with 5.6% and 24.9% under carbamide treatment,with 23.8% and 24.8% under organic fertilizer treatment,with 8.2% and 20.2% under mixed fertilizer treatment.Nitrate contents in the total soil of 1.2m decrease during active growth stage and increase during latter growth stage.Basically,there is no possibility of groundwater pollution existed because of nitrate leaching under three fertilizer treatments because the highest and the lowest value is 3.441 mg/kg and 0.944 mg/kg respectively in the depth of 1.2 m. Synthetically,the mixed fertilizer treatment is the best choice between the three different fertilizers taking into account the benefits of yield,quality and ecological environment. |
|
|
|