Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (4): 676-689.doi: 10.3864/j.issn.0578-1752.2019.04.009

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Responses of Crop Yields, Soil Carbon and Nitrogen Stocks to Additional Application of Organic Materials in Different Fertilization Years

GAI XiaPu1,LIU HongBin1,YANG Bo1,WANG HongYuan1(),ZHAI LiMei1,LEI QiuLiang1,WU ShuXia1,REN TianZhi2   

  1. 1Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture and Rural Affairs, Beijing 100081
    2Chinese Academy of Agricultural Sciences, Beijing 100081
  • Received:2018-07-24 Accepted:2018-09-25 Online:2019-02-16 Published:2019-02-27
  • Contact: HongYuan WANG E-mail:wanghongyuan@caas.cn

Abstract:

【Objective】In order to improve crop yield and soil fertility for rotation of winter wheat and summer maize in North China Plain, it is necessary to study the effects of long-term additional application of manure and straw incorporation on crop yield, soil carbon and nitrogen stocks. 【Method】 Taking the key experimental station on ecological environment of Drab Fluvo-aquic soil in Changping, Ministry of Agriculture as the research platform, two application histories (11 years and 27 years) and four application treatments (NPK, chemical fertilizers; NPKM, NPK+22.5 t·hm -2manure; NPKM+, NPK+33.75 t·hm -2 manure; NPKS, NPK+ straw) were conducted, and yield of winter wheat and summer maize as well as soil carbon and nitrogen stocks were analyzed. 【Result】Results showed that long-term additional application of manure or straw could increase crop yield. Compared with NPK, the yield of wheat and maize could be increased by 18.6%, 15.8%, 3.5% and 39%, 42%, 35% under NPKM, NPKM+ and NPKS, respectively, after 11 years. Meanwhile, yield of wheat and maize could be increased by 41%, 51.5%, 23% and 31%, 33%, 58% under NPKM, NPKM+ and NPKS, respectively, relative to NPK after 27 years. Soil organic carbon (SOC) and total nitrogen (TN) were increased after manure and straw added with the time prolonged. Specifically, stocks of soil carbon and nitrogen were 25-114 Mg·hm -2 and 2.2-9.0 Mg·hm -2, respectively, after 10 years, which were 29-146 Mg·hm -2, 2.5-12.1 Mg·hm -2, respectively, after 27 years. Both SOC and TN stocks presented the same trend which increased firstly and then decreased with the increasing of soil depth, reaching a peak at 80 cm. Peaks of SOC and TN pools were 102, 128, 146, 123 Mg·hm -2 and 8.3, 9.7, 12.1, 9.1 Mg·hm -2 for NPK, NPKM, NPKM+ and NPKS, respectively, after 27 years. However, no significant difference was observed under these treatments after 10 years (P>0.05). Soil ratios of C to N were reduced in different soil layers after two application histories with different organic material application, and soil C/N was obtained stability with the prolonged of fertilization years. Both SOC and TN stocks presented increasing trends with time. Compared with NPK, the accumulation stocks of SOC and TN could increase 5.2%, 11.2%, 9.2% and 21.2%, 26.6%, 38.8% under NPKM, NPKM+ and NPKS, respectively, after 11 years, which could increase 26.3%, 41.1%, 21.8% and 26.2%, 44.9%, 4.0% under NPKM, NPKM+, and NPKS, respectively, after 27 years. For a longer time, additional application of manure was better than straw for promoting SOC accumulation, while it was opposite for TN accumulation.【Conclusion】Based on the conventional fertilization, long-term additional application of manure or straw could increase crop yield, SOC and TN stocks thus promoted soil fertility. A great impact was observed with fertilization years added. In addition, application of manure had a more remarkable effect than straw incorporation, especially for a much long time, but on the contrary for accumulation stocks of TN.

Key words: organic manure, straw incorporation, crop yield, carbon stocks, nitrogen stocks

Table 1

Fertilization amount in each treatment (kg·hm-2·a-1)"

处理
Treatments
小麦 Wheat 玉米 Maize
N P2O5 K2O 有机肥
Manure
小麦秸秆Wheat straw N P2O5 K2O 有机肥
Manure
玉米秸秆
Maize straw
NPK 150 75 45 0 0 150 75 45 0 0
NPKM 150 75 45 22500 0 150 75 45 0 0
NPKM+ 150 75 45 33750 0 150 75 45 0 0
NPKS 150 75 45 0 2170 150 75 45 0 2170

Fig. 1

Response of crop yields and partial factor productivity of nitrogen (PFPN) to additional application of organic manure and straw incorporation Different lowercase (11 years fertilization) or uppercase (27 years fertilization) letters above each bar indicate significant differences, P<0.05"

Fig. 2

Responses of soil organic carbon (SOC) stocks and variations to additional application of organic manure and straw incorporation Different letters indicate significant difference for the results in the same column (P<0.05). Three replicates in the study. The same as below. “a” represent SOC stocks after 11 years fertilizations; “b” represent SOC stocks after 27 years fertilizations; “c” represent variations of SOC stocks (SOC stocks b-a)"

Table 2

Interprincipal effect test of different fertilization types, soil depth and fertilization years on stocks of soil carbon and nitrogen and C/N ratio"

变异来源
Variation source
因变量
Dependent variables
Ш型平方和
Quadratic sum of squares
Df
Degree of freedom
F Sig.
Significance level
施肥类型
Fertilization types (T)
土壤碳库SOC stocks 12245.007 3 79.734 <.001
土壤氮库TN stocks 98.287 3 85.845 <.001
碳氮比Ratios of C to N 107.216 3 15.832 <.001
土层深度
Soil depth (D)
土壤碳库SOC stocks 141872.456 9 307.938 <.001
土壤氮库TN stocks 630.196 9 183.473 <.001
碳氮比Ratios of C to N 547.745 9 26.961 <.001
施肥年限
Fertilization years (Y)
土壤碳库SOC stocks 21584.778 1 421.653 <.001
土壤氮库TN stocks 4.216 1 11.047 <.001
碳氮比Ratios of C to N 138.014 1 61.140 <.001
施肥类型×土层深度
T×D
土壤碳库SOC stocks 2305.072 27 1.668 <.05
土壤氮库TN stocks 39.807 27 3.863 <.001
碳氮比ratios of C to N 60.212 27 0.988 >.05
施肥类型×施肥年限
T×Y
土壤碳库SOC stocks 2341.579 3 15.247 <.001
土壤氮库TN stocks 39.058 3 34.113 <.001
碳氮比Ratios of C to N 52.189 3 7.707 <.001
土层深度×施肥年限
D×Y
土壤碳库SOC stocks 4273.625 9 9.276 <.001
土壤氮库TN stocks 86.500 9 25.183 <.001
碳氮比Ratios of C to N 271.041 9 13.341 <.001
施肥类型×土层深度×施肥年限
T×D×Y
土壤碳库SOC stocks 2182.463 27 1.579 <.05
土壤氮库TN stocks 33.137 27 3.216 <.001
碳氮比Ratios of C to N 117.867 27 1.934 <.01

Fig. 3

Response of soil total nitrogen (TN) stocks and variations to additional application of organic manure and straw incorporation “a” represent TN stocks after 11 years fertilizations; “b” represent TN stocks after 27 years fertilizations; “c” represent variations of TN stocks (TN stocksb-a)"

Fig. 4

Response of ratios of C to N to additional application of organic manure and straw incorporation “a”=soil C/N after 10 years fertilizations; “b”=soil C/N after 27 years fertilizations"

Table 3

Cumulative SOC and TN stocks with 0 to 200 cm soil depth for different fertilization treatments"

施肥处理
Treatments
累积碳库 Cumulative SOC stocks (Mg·hm-2) 累积库氮 Cumulative TN stocks (Mg·hm-2)
连续施肥11年
11 years fertilizations
连续施肥27年
27 years fertilizations
连续施肥11年
11 years fertilizations
连续施肥27年
27 years fertilizations
NPK 440 ±21 b 530.7±43 c 41±4 b 43± 3 c
NPKM 463±23 ab 671±51 b 50±5 ab 54±2 b
NPKM+ 490±34 a 749±40 a 52±4 a 63±4 a
NPKS 481±29 a 646±35 b 58±3 a 45±1 c
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