Effects of Different Nitrogen Sources Addition on Humification of Coconut Leaf Compost

doi:10.13304/j.nykjdb.2023.0650

Abstract

Abstract:

In order to investigate the effect of different nitrogen sources on the humification of coconut leaf compost， adding chicken manure， pig manure， biogas residue and urea as control variables to co-compost with coconut leaves，the indexs of temperature， the ratio of carbon to nitrogen ratio（T value）， humic substances， huminification rate， humification index and degree of humus polymerization were analyzed. The results showed that the 4 treatments could maintain the high temperature period （above 55.0 ℃） for more than 15 d， reached the harmless requirements. The T value was less than 0.6， which met the requirements of maturity. Compared with pre-fermentation and post-fermentation， composting led to a decrease in total oganic carbon， but humic substances carbon of 4 treatments increased， and the degree of humification increased. Chicken manure had the best effect on promoting the humification process of compost， after the composting， huminification rate increased by 19.28%， humification index increased by 65.80%， and degree of humus polymerization was 2.38. Adding pig manure as nitrogen source was lower than adding chicken manure， higher than adding biogas residue and urea. The huminification rate of adding biogas residue compost was the highest， but degree of humus polymerization was only 1.61， and the stability of compost products was poor. The decrease of humification index and degree of humus polymerization in coconut leaf compost with urea as nitrogen source hindered its humification process. In conclusion， humification effect was best when adding chicken manure as a nitrogen to source coconut leaf compost， and the results provided a scientific basis for the resource utilization of coconut leaf waste in Hainan.

Key words: compost, coconut leaf, nitrogen sources, humification

摘要：

为探究不同氮源对椰子叶堆肥腐殖化效果的影响，以鸡粪、猪粪、沼渣、尿素等不同氮源为控制变量，分别与椰子叶进行混合堆肥，对温度、发酵前后碳氮比的比值（T值）、腐殖质含量、腐殖化系数、腐殖化指数和腐殖化聚合度等指标进行分析。结果表明，各处理组的堆肥高温期（55.0 ℃以上）均超过15 d，达到无害化处理要求；T值均小于0.60，达到了腐熟要求；发酵后总有机碳含量下降，但各处理组的腐殖质碳含量上升，腐殖化程度增加。鸡粪处理组腐殖化效果最佳，其腐殖化系数增加19.28%、腐殖化指数增加65.80%，腐殖化聚合度达到2.38；猪粪处理组产品稳定性低于鸡粪处理，高于沼渣和尿素处理；沼渣处理组堆肥腐殖化系数最高，但腐殖化聚合度只有1.61，产品稳定性差；尿素处理组堆肥腐殖化指数和腐殖化聚合度降低，阻碍了其腐殖化进程。综上可知，鸡粪作为氮源添加对椰子叶堆肥的腐殖化效果最好，研究结果为海南地区椰子叶废弃物资源化利用提供科学依据。

关键词: 堆肥, 椰子叶, 氮源, 腐殖化

CLC Number:

S141.4

Xiaohong HUANG, Jing JIAO, Jihua DU, Yi WU, Zunxiang LI, Xinpeng LIU. Effects of Different Nitrogen Sources Addition on Humification of Coconut Leaf Compost[J]. Journal of Agricultural Science and Technology, 2024, 26(2): 162-170.

黄小红, 焦静, 杜嵇华, 吴翼, 李尊香, 刘信鹏. 不同氮源添加对椰子叶堆肥腐殖化效果的影响[J]. 中国农业科技导报, 2024, 26(2): 162-170.

Figures/Tables 11

Table 1 Property of raw material

原料 Raw material	含水率 Moisture content	总氮 Total nitrogen	总碳 Total carbon
椰子叶Coconut leaf	11.96	0.40	61.22
鸡粪Chicken manure	68.28	3.23	24.35
猪粪Pig manure	69.77	1.84	28.92
沼渣Biogas residue	94.24	0.43	2.30
尿素Urea	—	46.00	—

Fig. 1 Temperature in different treatmentsNote： 7， 14， 21， 35 and 42 d are the turning time， and the temperature decrease.

Table 2 Temperature changes in different treatments

处理 Treatment	最高温度 Maximum temperature/℃	到达高温期（≥55 ℃）所需天数 Number of days required to reach the high temperature period （≥55 ℃）/d	高温期（≥55 ℃）维持天数High temperature period （≥55 ℃） maintenance days/d	堆肥积温 Accumulated temperature of compost/℃
T1	74.5	4	25	2 699.4
T2	73.0	5	24	2 531.8
T3	74.5	4	20	2 329.3
T4	72.5	4	17	2 469.4

Fig. 2 C/N in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 3 TOC contents in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 4 HSC contents and increase in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 5 HA contents and increase in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 6 Content and increase of FA in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 7 HR in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 8 HI in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

Fig. 9 DP in different treatmentsNote： Different letters in same index indicate significant differences between different treatments at P<0.05 level.

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