摘要
为了研究种子发芽率和根长与种子发芽率指数(GI)评价指标的关系、取值及其在低碳氮比堆肥腐熟度评价方面的适用性,以猪粪为堆肥原料,进行了两组堆肥试验。其中一组添加初始物料湿重15%的木本泥炭作为调理剂和固氮剂,另一组在添加相同比例木本泥炭的基础上再添加过磷酸钙进行优化,过磷酸钙的添加比例约为初始物料干重的16%。通过两种种子(萝卜种子和白菜种子)的发芽试验,结合概率统计原理对堆肥的腐熟度进行了评价。研究结果表明,两个处理在整个堆肥过程中均维持了较高的NH+4-N含量(1.77~3.40 g·kg^(-1)DM),而较高的NH+4-N含量是抑制种子根长伸长的主要原因。因此,将种子发芽率(SG)和相对种子根长(RRG)这两个指标相结合比种子发芽率指数(GI)这单一指标更能准确地评价低碳氮比堆肥的腐熟度,当SG≥70%且RRG≥50%时,表明堆肥已达到腐熟且对作物无盐害。
Seed germination（SG）, germination index（ GI ）, and relative root growth （RRG） have been widely used to evaluate the maturity of composts. This research was to examine their applicability to the evaluation of low C/N compost maturity. Two treatments, pig manure a- mended with woody peat at 15% of the initfal composting material wet weight（T1 ） and T1 supplied with superphosphate at 16% the initial composting material dry weight, were designed. Two kinds of seeds （radish seeds and cabbage seeds ） were examined. Results showed that accumulation of ammonium nitrogen in the compost was observed in two treatments, with ammonium nitrogen ranging from 1.77 g· kg-1 DM to 3.40 g· kg-1 DM. High ammonium nitrogen was a major factor inhibiting the root elongation. It was better for compost maturity evaluation to use combined SG and RRG than GI. Both SG≥70% and RRG≥50% would indicate that the composts are mature and don＇t cause salt damages to crops.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2016年第1期179-185,共7页
Journal of Agro-Environment Science
基金
国家“十二五”科技支撑项目“农业废弃物高效循环利用关键技术研究”(2012BAD14B01),“珠三角地区农牧高效循环技术集成与示范”(2012BAD14B16)
香港中向国际木本泥炭农业领域应用研究项目
国家自然科学基金(41201282)
中小企业发展专项资金中欧国际合作项目(SQ2013ZOA000008)
