摘要
我国水稻生产氮肥用量大,氮肥利用率低。大量N素从稻田流失进入环境,对环境生态构成潜在威胁。经与IRRI协作,为金华双季稻区创立了适地养分管理新技术(SSNM)。SSNM的施肥综合考虑了当地的气候条件,水稻品种的潜在产量和养分需求,土壤固有养分的供应能力,养分利用效率和平衡养分供应,以及社会经济效应等。同农民常规施肥相比,在产量略有增加的同时,SSNM可以显著提高氮肥利用率,平均减少氮肥用量约30%,从源头上遏制了氮肥引起的面源污染。多年的田间试验表明,SS-NM具有在广大稻区推广的前景。
In China, average rate of N application for rice production is high and fertilizerN use efficiency is low compared with other major rice growing countries. Environmental pollution by nitrogen leaching or runoff from rice fields has become a serious concern. In cooperation with IRRI scientists, we developed a new sitespecific nutrient management (SSNM) approach for doublerice growth area of Jinhua. The field and seasonspecific fertilizer recommendations are worked out taking into account indigenous nutrient supply, reasonable grain yield targets and corresponding nutrient demand, nutrient balance and nutrient use efficiency, as well as socioeconomic factors. The agronomic performance of SSNM was tested against the farmer's fertilizer practice (FFP) in the past five years (19982002) cropping seasons. Compared with FFP, when SSNM was adopted, average grain yield increased by 0.4 t/hm2 and nitrogen use efficiency increased significantly. About 30% of fertilizer N used in current rice production could be reduced through adoption of SSNM, which could effectively cut off the nonpoint pollution resource of N from rice fields.
出处
《浙江大学学报(农业与生命科学版)》
CAS
CSCD
北大核心
2003年第1期67-70,共4页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国际合作资助项目