Conservation Agriculture Research Updates - April 2026

This article from China uses amplicon sequencing to determine how tillage practices impact microbial communities in plots that have strip till maize (ST), and maize plus residue (ST+R), and rotary tillage maize (RT). Compared to RT, ST and ST+R increased the Shannon diversity index of microbial communities. The paper presents more detailed results. The Mantel test showed that soil bacterial communities were significantly correlated with electric conductivity (EC) and available potassium, while soil fungal communities were significantly correlated with EC and soil organic carbon. They conclude that "strip tillage could improve microbial community diversity and microbial regulation of the N and S cycles in black soil, providing a microbiological perspective for conservation agriculture. 

This paper looks at smallholder farmers issues with tractor mechanization using a survey of 208 farmers, 18 focus groups and 28 key informants in 3 Districts of Zambia. Issues looked included adoption, preferences for ownership, and financing. Tractor ownership revolves around improvement in productivity but also income generation from service provision to other farmers tied to better timing and narrowing planting windows. Differences in gender affect ownership with males preferring individual ownership and females prefer group ownership. Incentives for ownership were best for risk-contingent credit especially if bundled with repair insurance. Barriers to adoption included high maintenance costs' poor access to spare parts and financial issues. They conclude that "successful interventions must be flexible, gender-responsive and tailored to the local context." 

This interesting article from Japan looks at a solar powered mower integrated into a NT system that reduces GHG emissions. This study evaluates NT and intercropping with solar-powered machinery in organic cherry tomato production. They compared two tillage methods (NT} and rotary tillage (RT)] and two cropping patterns [cherry tomato/peanut intercropping (TP) and monocropping (M)]. Solar-powered robotic mowers replaced conventional mowers in NT to enhance environmental benefits. They assessed the results by crop yield, energy efficiency, carbon footprint, and profitability. They conclude that "NT-TP's potential to enhance yield, energy efficiency, and profitability while reducing the carbon footprint, makes it a sustainable management system for organic farming. 

This paper looked at a strip-till one-pass machine that regulated and monitored sowing rate and depth while applying fertilizer. The objective was to assess the accuracy of this wheat drill. They found the accuracy was 97% and 92% in lab and field tests, respectively. Field germination was 88%. The authors conclude that their machine can facilitate planting wheat in accordance with CA needs.

This paper from Brazil looks at the problem of managing crop. residues during sowing in a no-till system. This research looked at four straw-cutting discs effect under three vertical loads, analyzing the energy performance in a maize- brachiária cropping system. They applied 3 vertical loads applied to 4 types of cutting disks. Data collected included mobilized soil, working depth, average drawbar force, horizontal force per area of mobilized soil, specific force, power demanded, hourly fuel consumption, and specific fuel consumption. They concluded that the Turbo disc reached the soil's lowest depths. Increasing the vertical load applied to the cutting discs results in greater disturbance to the ground.

Development of equipment to allow farmers to plant crops using NT and residues is important and so I am presenting this paper from PAU in the Indian Punjab as an example of local development to allow farmers to grow crops after rice without burning the residues. The paper reports on a four-wheel tractor seeder (PSS) that can sow wheat with success in a combine harvested rice crop. They evaluated the PSS seeder under varying straw load, forward speed, rotor speed, fuel consumption, field capacity, seed emergence and grain yield. They compared these factors for the PSS against the Happy Seeder (HS) and Super seeder (SS), two previously developed equipment used for NT wheat into rice residue. They concluded that "the PSS showed promise for in‐situ management of rice straw as it eliminates most of the operational problems encountered by the existing seeders (HS and SS)."

The traditional rice-wheat-mung cropping system in North Bihar, India has experienced declining yields and water constraints. This paper looks at alternative tillage and crop establishment (TCE) practices to remedy this problem. Five different TCE practices were evaluated in on-farm experiments. The best yields were found with Zero-tilled direct seeded rice (ZTDSR) followed by Happy Seeder ZT wheat (HSZTW) and HS gram (HSG). This treatment also provided the highest net returns with this CA based system out-performing traditional systems.

This paper looks at the issue of residue burning in the rice-wheat areas of the Indo Gangetic Plains of India. This is an easy way for farmers to handle rice residue problems before planting wheat, but it has negative impacts on air pollution and GHG emissions. The authors analyzed data from 60 focused group discussions and 24 interviews with farmers and key stakeholders involved with agriculture to get perspectives on crop residue burning (CRB). The people surveyed highlighted the diversity of machinery used in this cropping system and identified the time from rice harvest to wheat planting to implement CR management.Farmers mentioned a mistrust and uncertainty of incentives  for no-burn CRM and access to no-burn technology and equipment.

This paper evaluates the effectiveness of various furrow openers for tackling the problems associated with residue management and as an alternative for burning in India. The assessment was done in in a simulated soil bin and looked at various forward speeds and 3 straw densities at a consistent working depth of 5cm. Results showed that draft requirements increased with forward speed and straw density, while straw cutting efficiency decreased with these two factors. The double disk furrow opener showed the highest straw-cutting efficiency (81.36%) at a working speed of 1.5 km h−1 and a straw density of 1 t ha−1.

This article from China looks at disc coulters as effective tools for managing maize residues in CA. A maize residue interaction model was developed and validated against field test results. Experiments looked at and disc and tilt angle for wavy, notched and plain disc coulters. Four measures included draft force (FD), soil disturbance area (ASoil), flat residue-cutting efficiency (RFC) and standing residue cutting efficiency (RSC). Increasing disc angle had a significant positive effect on FD and Asoil while resulting in higher RFC and RSC. The optimal angle of the three disc types were determined and reported in this paper. The wavy disk was suggested as the preferred choice.  since it had higher RFC and RSC values.

One key issue for CA is development of appropriate machinery for farmers. This article from China looks at the design and testing of a row cleaner for straw. The traditional NT seeder in China has a low straw cleaning rate and high working resistance. This paper addresses this problem with something they call a bionic elastic row cleaner. It has curved teeth and a torsion spring for throwing straw. Results show that it improved the cleaning rate and and the working resistance and is suitable for maize straw mulching.

There has been a rise in the number of market-oriented farmers, known as `emergent farmers,' who acquire and utilize tractors and associated implements for agricultural production to Zambian agriculture. This study examined the behavioral intentions of Zambian emergent farmers concerning Mechanized Conservation Agriculture (MCA) using the Decomposed Theory of Planned Behavior constructs: attitudes, perceived behavior control, subjective norms, and farmers' background factors by surveying 119 emergent farmers. Factors such as media influence, social influence, technical training, and extension services had positive but insignificant effects on farmers' intention to adopt MCA. Background factors, including overall farm size, farmer's age, area under CA, and years of CA use, showed a positive and significant correlation with farmers' intention to adopt MCA.

With the residue not being burnt and left as a mulch, there is a need for equipment to plant into this residue. This paper This paper describes a automatic control strip-till piece of equipment to overcome this problem in maize in China. The equipment has an air spring and electric linear actuator that controls the plowing depth straw width control that improves the stability of the equipment. Field tests showed that the straw clearing and soil crushing rates, tillage depth and breadth stability were above 90%. They conclude that the designed equipment would allow conservation tillage  for maize farmers.

Manual methods of farming are common in Africa and also in Zimbabwe where this paper was written. It measures the fuel consumption needed to use a two-wheel tractor to relieve the drudgery of manual farming in this country. This is important for calculating the cost of mechanizing agriculture and GHG emissions. This study measured fuel consumption for 2-wheel tractors in direct seeding for sorghum and pearl millet crops in sandy soils at varying speeds of operation. The information in this paper can be used by farmers and other operators of 2WTs for planning the fuel quantity and budgetary requirements.

This paper describes conservation agriculture (CA) as a way of achieving the Sustainable Development Goals (SDGs). The authors suggest that "CA can prove to be a viable option for meeting the targets of the sustainable agenda. This practice supports environmental, social and economic justice, which creates a holistic developmental route that supports the burgeoning population." CA also reduces production costs that favors farmer adoption. However the paper concludes that "while CA demonstrates significant benefits across scales, its adoption remains constrained by socioeconomic factors and limited mechanization in the smallholder context. Advancing CA requires a multidisciplinary, participatory research paradigm coupled with policy support, institutional support and capacity building for farmers. 

Crop residue is crucial in CA management to improve soil health and increase yields. This paper from India looks at a residue cleaning system (T1) to help overcome the challenges of residues left after combine harvesting and included design, development and field testing. They first tested the equipment in a soil bin before testing in a field trial consisting of a wheat-greengram-maize cropping pattern and comparing with the Happy Seeder (T2) (an earlier equipment used for sowing into crop residue). T1 and T2 had similar yields but T1 required less energy although it slightly higher carbon emissions. They concluded that T1 had lower B/C ratio compared to T2 but increasing the number of rows in the T1 treatment could enhance field capacity, potentially reducing carbon emissions and improving economic returns.

Cover crops are becoming popular especially in countries where there is space to grow a CC. However, there is a need to terminate a CC so it doesn't affect the growth of the following cash/food crop. The following are three common ways to do this: winter frost, herbicide chemical treatments, or mechanical methods. This paper looks at possible mechanical systems for termination. They developed a modular multiple tools prototype to evaluate different tools that looks at them individually and together. 3 tools were evaluated: tine cultivator, disk harrow and crimper roller and then tested with a vetch and barley CC's. The best combination was the disk harrow 15 degrees, used alone and in combination with other tools considered (crimper roller and tine cultivator for barley, crimper roller for vetch) with a termination rate greater or equal to 85%.

The authors of this paper are looking at traditional grains like sorghum, pearl and finger millet to combat climate change and drought in sub-Saharan Africa (SSA) as alternatives to maize the staple food in this area. The main objective of this review paper is to identify suitable equipment for smallholders to mechanize growing these traditional grains. They reviewed six databases to find suitable equipment used globally. They found that the mechanisation of traditional grain production operations is lagging behind that of other cereals and so there is a need to work on development of suitable equipment  for smallholder farmers. They suggest use of two-wheel tractors and service providers as a way to move forward. Policy decisions and recommendations for improvement were made.

This paper looks at Ridge Tillage (RT) in Germany that results in better root growth and reduced erosion. The study develops an auto-steered living mulch seeder using a navigation satellite system to guide making ridges. It also compares weed control for ridge-hoeing with conventional flat tillage (FT). They also looked at RT compared to FT for maize root development, yield, soil temperature, and soil moisture. Root penetration was 40 % higher in RT than in FT with RT producing more maize root biomass compared to FT.

Conventional farming in Sub-Saharan Africa (SSA)  is resulting in soil degradation. This paper reviews current practices, challenges, and constraints to the adoption of CA in SSA to reverse this degradation. They show that CA is only adopted on 1.25% of cultivated land in SSA despite 2 decades of promotion. The paper lists 6 possible reasons for this lack of adoption of CA. They also suggest that adoption by smallholder farmers is also obstructed by socio-economic factors due to smallholder farmers’ focus on short term yield increases and their lack of access to markets, loans, and education. They conclude that wider adoption by smallholder farmers in SSA requires CA approaches that are downscaled to fit the existing tillage tools and the specific agroecological and socio-economic farm settings.

This paper from China looks at service providers as a way to promote CA. It identifies the stakeholders of normative Conservation Agriculture technology adoption behavior and the relationship between agricultural machinery service organizations, farmers and agriculture-related governments. They developed a unique evolutionary game model to evaluate the decision making characteristics of tripartite behavior and simulate the evolution trend of stakeholder behavior. They suggest that agriculture Governments, service providers and farmers can develop stable strategies. The study lays a foundation for countermeasures and suggestions to further promote farmers’ implementation of Conservation Agriculture technology.

This paper from Italy looks at a disc chain harrow for terminating cover crops and preparing a seedbed in a conservation tillage (CA) system that allows more timely planting. The cover crop was hairy vetch followed by soybeans. A total of three trials were carried out.  (1) compare two disc types in two different front + rear combinations and two different working speeds; (2) evaluate the seedbed preparation by the disc chain in terms of soybean establishment as a following cash crop; (3) evaluate operational characteristics (working speed, fuel consumption, absorbed power, etc.) of the disc chain at the two different speeds. The results show that a disc chain harrow was successful using low pulling force, low energy and fuel consumption as compared to other conservation practices. It does not say if soybeans were direct drilled.

Since equipment suitable for no-till is vital for success, I included this paper from China that looks at the design of a furrow opener where residue is left on the soil. The paper proposes that this opener helps preserve soil moisture and that planted seeds are consistently covered with soil. The implement was tested in a soil bin and also using simulation. The paper provides results on what they they found for this furrow opener.

This paper looks at diversification of maize-based systems with legumes  to counteract climate change and soil fertility decline in Zambia. Maize-legume diversification strategies included single row intercropping, strip cropping and crop rotation under CT and CA in 4 Districts in Zambia. Data was collected from on-farm trials over 3 growing seasons. Results showed no significant effect of cropping systems on individual maize and legume grain yield across growing seasons, but substantial nutritional and economic benefits of intercropping systems due to simultaneously growing two crops especially in maize-legume intercropping strategies compared to sole maize and maize-legume rotation. Although there was increased labour requirements to manage the intercrops, these cropping systems had much higher net benefits and returns to labour and inputs than the other cropping systems tested.

This research paper from China looks at using Strip Tillage to resolve the problems of planting maize where all the residue is returned to the field. They use a Soil-Straw model using a discrete element method (DEM) to study this problem. They propose that a vertical rotation-based straw strip cleaning and soil tillage method with three vertical straw strip cleaning and soil tillage devices combining spring teeth (ST) and rake teeth (RT) design be used. Results showed that the straw cleaning and soil fragmentation rates of the proposed system combination were 97.7 % and 96.4 % and thus provides a new solution for a wide range of straw cleaning for planting maize.