conservation tillage improves soil properties and crop yields in north china. li hongwen
TRANSCRIPT
5th World Congress on Conservation Agriculture
Conservation tillage improves soil properties and crops yields in North China
China: He Jin, Li HW, Li H, Liu Lijing
Australia: J.N. Tullberg (Unviersity of Queenlans)
A.D. McHugh (University of South Queensland)
Prof. Li Hongwen
Changjiang Scholar, China Agricultural UniversityHead, Conservation Tillage Research Center
(CTRC), MOA, P.R. China
http://www.cn-ct.net
Why CA?
1. Severe soil degradation
Soil, water and nutrient loss For instance, in China’s ‘Yellow’ River catchment, loess soils are
being lost at average rates of up to 100t/ha.yr or about 8mm/yr
Dryland farm : 60% of total farmland Annual rainfall < 400mm: 15 Provinces Draught : 60% of yield loss by natural disaster
2. Drought and water shortage
3. Declining of groundwater level
North China Plain
Groundwater over-exploitation The formation of underground funnel
Average annual groundwater level decline more than 1m in some regions
4. Low and unstable crops yields
Soil erosion
Blowing dust
Traditional tillage aggravated environmental destruction
SOM loss Soil erosion Low yield
High fuel consumption Increased CO2 emission High cost and low income
Conservation tillage:
------No or minimum tillage ------Permanent organic soil mulch cover ------Temporal and/or spatial diversity of crops
Objectives
Identify the impacts of long-term conservation tillage on soil properties and crop yields in dryland farming areas in North China
Present suggestions for further research to enhance the development of conservation tillage in China
Material and Methods
Daxing,Beijing
Linfen,Shanxi
Wuchuan,Inner Mongolia
1. Experimental sites1. Experimental sites
Experimental sites Altitude(m)
Mean annual rainfall(mm)
Mean annual temperature(oC)
Linfen, Loess Plateau(1992-2007)
360-500 500 10-12
Daxing,North China Plain
(2000-2007)45 526 10-12
Wuchuan,farming pastoral ecotone
(1998-2008)
1500-2000 360 2.5
2. Weather information2. Weather information
4. No-till planter4. No-till planter
2BMF-7 no-till wheat planter
2BMD-12 Strip-chopping no-till planter Daxing
Linfen, Wuchuan
Heavy residues cover
Low residues cover
Results and Discussion
1. Soil organic matter (g/kg)
0-10cm: Linfen: CT > TT, ↑21.7% Daxing: CT > TT, ↑10.5% Wuchuan: CT > TT, ↑23.1%
Higher SOM in CT due to:
Ⅰ. Greater straw cover; Ⅱ. Reduced biological oxidation; Ⅲ. Less soil disturbance.
2. Total N and Available P
Sites TreatmentTotal N (g/kg) Available P
(mg/kg)Soil depth
0-10cm 10-20cm 0-10cm 10-20cm
Linfen, Loess Plateau
CT 1.03a 0.67a 35.0a 10.5a
TT 0.68b 0.66a 22.4b 22.9b
Daxing,North China Plain
CT 1.38a 1.02a 20.2a 16.9a
TT 1.11b 0.86b 13.6b 13.9b
Wuchuan,farming pastoral ecotone
CT 0.52a 0.30a 17.9a 8.3a
TT 0.42b 0.24a 16.2b 10.1b In 0-10cm layer, Total N in CT was 51.5%, 24.3% and 23.8% higher than
in Traditional Tillage in Linfen, Daxing and Wuchuan.
In 0-10cm depth, the AP was 56.3%, 48.5% and 10.5% higher for CT than for TT in Linfen, Beijing and Wuchuan;
The topsoil accumulation of P in CT due to: Ⅰ. Limited downward movement of particle-bound P in soils; Ⅱ. Upward movement of nutrients from deeper layers
through nutrient uptake by roots.
Available P (AP):
Change of soil surface conditions under CT and TT after 16 years in Linfen
Conservation tillage
Traditional tillage
3. Crops yields
Wheat (kg/ha):
1000
2000
3000
4000
5000
6000
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
CT TT Linfen
Mean yield: CT>TT, ↑579kg/haMean yield: CT>TT, ↑138kg/ha
3000
4000
5000
6000
2000 2001 2002 2003 2004 2005 2006 2007
CT TT Daxing
Mean yield: CT>TT, ↑171kg/ha
0
1000
2000
3000
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
CT TT Wuchuan
Maize:
4000
5000
6000
7000
8000
2000 2001 2002 2003 2004 2005 2006 2007
CT TT
Mean yield: CT>TT, ↑423kg/ha
Daxing
Conclusion
CA can improve soil properties and crops yields in North China;
Conservation tillage is a solution for Chinese agro-environment and food security
Introduction of Conservation Tillage Research Centre, MOA农业部保护性耕作研究中心介绍
and Conservation Tillage in China以及中国保护性耕作状况
Conservation Tillage Research Centre, MOA农业部保护性耕作研究中心
The only organization specially on CT research in China; Locates in College of Engineering, China Agricultural University
专门从事保护性耕作研究的机构,挂靠中国农业大学工学院
•Use our hands to protect our soil and get good harvest
Machine Development
Conservation Agriculture
Yields产量
Cost 成本
Wind erosion
Water erosion
Soil Moisture
Weeds Control
GHG EmissionOthers
Tasks 任务
1. CA Machines
1992 : Started Conservation Tillage research with ACIAR Projects
Results: With No till Seeders developed by CTRC , answered:Is CA practicable in China?How to do CA ?What are the benefits of CA?Can we use machines to do CA in China?
Corn No-till Planter
5 Rows 6 rows
9 rows7 rows 10 rows
No Till wheat Seedersfor areas with one crop a
year
1998 年 : started to do research on no till seeding into maize stubble cover field
Series No-till Wheat Planter in Annual Two-
crop Regions
Strip chop no-till seeder
Subsoiler
Shallow Tillage Weeder
2. Conservation Tillage /Environment
( Runoff, Sediment transport, green house gas emission )
Experimental and Monitoring Sites
★★★★阳高★张北★武川
★正蓝旗 ★赤峰★凌源★阜新
500 km400 km
300 km
★丰宁
150 km
Around Beijing
(1) Water Erosion 水蚀
Rainfall Simulation
降雨模拟
Runoff Experiments
径流试验区
(2) Wind Erosion
Satellite Image
Sampling in the field
Wind Tunnel
12
10
8
6
4
2
0Fengning ZhangBei Inner Mongolia Beijing
丰宁 张北 内蒙古 延庆↘50%
(3) Soil Fertility 培肥地力
SOM 有机质: Increase 0.03% per year
Earth Worm
After years : 3 ~ 5/m2
After years: 10 ~ 15/m2
(4) CO2 FluxDouble Cropping Area
Single cropping area
North of China
Study Sites
321
Conventional Tillage (11.30g/m2) produced more CO2 emission than Rotary till (9.63g/m2) and No-till (7.99g/m2) for the whole year.
传统耕作 11.30g/m2 , 比旋耕 9.63g/m2 和免耕 7.99g/m2
0100
200300
400500600
700800
9001000
5- Apr 20- Apr 5- May 20- May 4- J un 19- J un 4- J ul 19- J ul 3- Aug 18- Aug 2- Sep 17- Sep 2- Oct 17- Oct 1- Nov 16- Nov
date
CO2
flux
mg m
(-2
h-1
)
convent i onal t i l l ageRotary t i l l ageNo t i l l age
5/Apr 5/May 4/Jun 4/July 3/Aug 2/Sep 2/Oct 1/Nov
3. Controlled Traffic/Permanent Raised
Bed
4. Integration of Mechanical and Electrical Industry in CT
机电一体化技术在保护性耕作中的应用
Tractor Guidance 机械方式拖拉机导向系统
Control systemSteering systemDetecting system
The tractor can be guided to follow the crop row at lower speed
拖拉机可以顺着原有玉米行行走
Camera Guidance 数码方式导向
Automatic monitoring Stubble Cover Rate利用数码照片快速测定覆盖率
Papers
More than 20 English Papers, 100 Chinese papers
Own more than 40 Patents
State Intellectual Property Office of P.R.C
Min-till seeders for wheat into maize stubble
Training
0123456
2002 2003 2004 2005 2006 2007 2008 2009 2010Year
Are
a /M
ha
Development of CT in China中国保护性耕作发展A
rea
/M h
a 面
积 (百
万公顷)
Year 年份
Thank you!