Johan Bouma

Future Directions of Precision Agriculture

Precision Agriculture is advancing but not as fast as predicted 5u2009years ago. The development of proper decision-support systems for implementing precision decisions remains a major stumbling block to adoption. Other critical research issues are discussed, namely, insufficient recognition of temporal variation, lack of whole-farm focus, crop quality assessment methods, product tracking and environmental auditing. A generic research programme for precision agriculture is presented. A typology of agriculture countries is introduced and the potential of each type for precision agriculture discussed.

Hydropedology: Synergistic integration of pedology and hydrology

This paper presents a vision that advocates hydropedology as an advantageous integration of pedology and hydrology for studying the intimate relationships between soil, landscape, and hydrology. Landscape water flux is suggested as a unifying precept for hydropedology, through which pedologic and hydrologic expertise can be better integrated. Landscape water flux here encompasses the source, storage, flux, pathway, residence time, availability, and spatiotemporal distribution of water in the root and deep vadose zones within the landscape. After illustrating multiple knowledge gaps that can be addressed by the synergistic integration of pedology and hydrology, we suggest five scientific hypotheses that are critical to advancing hydropedology and enhancing the prediction of landscape water flux. We then present interlinked strategies for achieving the stated vision. It is our hope that by working together, hydrologists and pedologists, along with scientists in related disciplines, can better guide data acquisition, knowledge integration, and model-based prediction so as to advance the hydrologic sciences in the next decade and beyond.

Soil Security: Solving the Global Soil Crisis

Soil degradation is a critical and growing global problem. As the world population increases, pressure on soil also increases and the natural capital of soil faces continuing decline. International policy makers have recognized this and a range of initiatives to address it have emerged over recent years. However, a gap remains between what the science tells us about soil and its role in underpinning ecological and human sustainable development, and existing policy instruments for sustainable development. Functioning soil is necessary for ecosystem service delivery, climate change abatement, food and fiber production and fresh water storage. Yet key policy instruments and initiatives for sustainable development have under-recognized the role of soil in addressing major challenges including food and water security, biodiversity loss, climate change and energy sustainability. Soil science has not been sufficiently translated to policy for sustainable development. Two underlying reasons for this are explored and the new concept of soil security is proposed to bridge the science–policy divide. Soil security is explored as a conceptual framework that could be used as the basis for a soil policy framework with soil carbon as an exemplar indicator.

Implications of the Knowledge Paradox for Soil Science

Abstract Research results that could potentially provide a major contribution to innovation and sustainable development are often not accepted by or implemented in society. This, in short, is the knowledge paradox that is also relevant for soil science. The need to operate in a more interactive mode towards stakeholders and policy makers has been recognized in literature, has become more urgent in our Knowledge Democracy and is accepted by funding agencies. But true transdisciplinarity is difficult to realize and recommendations are discussed for soil science research to improve its effectivity by (i) focusing on unique niches, defined here in terms of seven basic soil functions, some of which have been preempted by others; (ii) considering the policy cycle as a point of reference; (iii) focusing on deriving a series of options (each one with economic, social and environmental tradeoffs) rather than on single solutions of problems related to sustainable development; and (iv) taking the entire knowledge chain into consideration from the tacit to the cutting-edge. Additional attention is suggested for communication and public relations in terms of (i) defining soil quality; (ii) adopting the ecological footprint concept and (iii) presenting storylines for major soil types. Transdisciplinarity requires working in “Communities of Practice” (CoPs); but first, the soil science profession should improve internal cohesion and cooperation by combating current atomization of subdisciplines and by defining mutual responsibilities in soil science “Communities of Scientific Practice” (CSPs) with special attention to quality control, education, and basic research, which is vital for the future of the soil science profession.

Combining pedotransfer functions with physical measurements to improve the estimation of soil hydraulic properties

Simulation modelling is an important tool in evaluating the economical and environmental effects of different farm management practices. Availability and quality of input data are crucial factors that determine the accuracy of modelling results. With respect to soil water regimes, much depends on the accuracy of soil hydraulic properties. These are conventionally derived through expensive laboratory measurements. Pedotransfer functions have been developed to increase cost effectiveness: hydraulic properties are estimated using basic soil properties that can be measured with relative ease. This study compares four methods to derive hydraulic properties by analysing their effect on simulated soil moisture contents. Applied methods include: (A) laboratory measurements, (B) class pedotransfer functions, (C) continuous pedotransfer functions and (D) continuous pedotransfer functions combined with simple laboratory measurements. Modelling performance was evaluated by comparing simulated and measured soil moisture contents for three sites and two depths. Modelling uncertainty was evaluated through Monte Carlo simulations. The combination of continuous pedotransfer functions and simple laboratory measurements (method D) clearly produced best results. Modelling performance was highest overall and results were consistent for individual profiles and depths. Modelling uncertainty was lowest, far lower than the uncertainty resulting from the measured data set (method A). Based on these results, a general procedure was defined to combine continuous pedotransfer functions with simple soil physical measurements.

Chapter Six - The Role of Knowledge When Studying Innovation and the Associated Wicked Sustainability Problems in Agriculture

Scientific institutions all over the world emphasize the importance of effective links between science and society when pursuing sustainable development thereby linking science and development. Unfortunately, the knowledge paradox implies that too much research is not applied, partly because the research community is still rather inward looking, creating a gap between what is written and what is achieved in practice. The Dutch government initiated, therefore, the large 6-year TransForum program to enhance innovation in agriculture, not allowing the regular research circuit to set the agenda. TransForum emphasized the relevance of connected value development when dealing with wicked problems associated with sustainable development, requiring a balance between the well-known people, planet, and profit aspects of sustainable development. Thus new and innovative 3P businesses were created through the sequence of value proposition, -creation, and -capture, together constituting connected value development. This required transdisciplinary interaction between knowledge institutions, entrepreneurs, nongovernmental organizations (NGOs), and governmental bodies working together on innovation (KENGi partners), each of these partners contributing different opinions, goals, and values. In this chapter, four case studies are used to illustrate that innovation was achieved by successively working together on value proposition, -creation, and -capture. Only the committed persistence of entrepreneurs supported by knowledge brokers and development of new business and organizational models ultimately led to the desired connected value development, representing a successful link between knowledge creation and societal appreciation. The process involved mobilization and strategic injection of various forms of tacit and scientific knowledge in the overall interaction process that often took more than 10 years to mature, requiring an important role for knowledge brokers with hard knowledge and social intelligence (“T-shaped skills”) as well as long-term funding. The development of value propositions needed much more attention than is usually provided. Research planning and management procedures as well as judgement procedures need to be adapted to fit transdisciplinary requirements. The cases demonstrate that the process of connected value development is unique for each project; there is no standard recipe. Track records of case studies, as presented, can be used in education as a learning tool to create awareness for possible opportunities as well as pitfalls in transdisciplinary studies.

The Role of Scientists in Multiscale Land Use Analysis: Lessons Learned from Dutch Communities of Practice

Many research and scientific organizations emphasize the importance of science for society in their strategic plans. This is certainly true for land use studies being discussed in this chapter as new environmental policies are introduced at European and national level. Such policies reflect concerns of society so that a structural link between science and policymaking would appear to be logical and desirable. Rather than following traditional top‐down and disciplinary research approaches, emphasis is increasingly being placed on interactive, interdisciplinary work in Communities of Practice (CoPs) in which scientists work together with various stakeholders and policymakers in a joint learning mode. But this requires new research approaches including long‐term engagement during the entire policy cycle asking for a new attitude of scientists. Few experiences have been reported so far. Three Dutch case studies are therefore discussed to illustrate the functioning of CoPs by focusing on up‐ and downscaling (called multiscaling hereafter), a key element of land use research. Five types of multiscaling were used in the three case studies. Three were technical: (1) use of model‐ or design‐based (geo)statistical techniques, (2) extrapolation of data obtained from experimental plots to larger areas, and (3) use of quasi‐3D process models to upscale grid data in a Geographic Information System (GIS) to regions. Two were policy oriented: (1) nutrient balances for farms to allow upscaling from fields to farm and (2) a research framework for regions, based on the DPSIR approach, which sequentially covers aspects mentioned in environmental laws as being important for sustainable development. Quite diverse and unrelated questions about land use issues by different members of the CoP cannot be a fruitful basis for research programs. Scientists have therefore an important role to play within a CoP in orchestrating a demand analysis that puts questions into context and defines existing knowledge as well as knowledge gaps. Defining research on the basis of a demand analysis in a CoP creates innovative ideas, creates commitment of participants, and allows definition of needed research that is functional. This includes cutting edge research publishable in literature and requires for land use studies updating of valuable existing soil survey information to a level that can be used in modern modeling techniques including functional characterization of soil series, development of pedotransfer functions, and definition of phenoforms. Particular attention is needed for introducing modern monitoring techniques for soil and water because the high cost of traditional methods implies that little monitoring is done now with detrimental effects for the calibration and validation of simulation models that increasingly secure a live of their own. The scientific community needs to take a fresh look at its paradigms. Next to the establishment of CoPs, we therefore advocate development of Communities of Scientific Practice (CSP) within the research community that define different functions for members of the scientific community in terms of (1) communication within CoPs by shaping the demand analysis and to the outside world and (2) defining research needs and its execution, using knowledge chains including basic research.

A whole-farm strategy to reduce environmental impacts of nitrogen.

Dutch regulations for ammonia emission require farmers to inject slurry into the soil (shallow) or to apply it in narrow bands at the surface. For one commercial dairy farm in the Netherlands it was hypothesized that its alternative farming strategy, including low-protein feeding and surface spreading, could be an equally effective tool for ammonia emission abatement. The overall objective of the research was to investigate how management at this farm is related to nitrogen (N) losses to the environment, including groundwater and surface water. Gaseous emission of ammonia and greenhouse gasses from the naturally ventilated stables were 8.1 and 3.1 kg yr(-1) AU(-1) on average using the internal tracer (SF(6))-ratio method. Measurements on volatilization of ammonia from slurry application to the field using an integrated horizontal flux method and the micrometeorological mass balance method yielded relatively low values of ammonia emissions per ha (3.5-10.9 kg NH(3)-N ha(-1)). The mean nitrate concentration in the upper ground water was 6.7 mg L(-1) for 2004 and 3.0 mg L(-1) for 2005, and the half-year summer means of N in surface water were 2.3 mg N L(-1) and 3.4 mg N L(-1) for 2004 and 2005, respectively. Using a nutrient budget model for this farm, partly based on these findings, it was found that the calculated ammonia loss per ton milk (range 5.3-7.5 kg N Mg(-1)) is comparable with the estimated ammonia loss of a conventional farm that applies animal slurry using prescribed technologies.

Simulation of soil water regimes including pedotransfer functions and land-use related preferential flow

Abstract Differences in land use history among taxonomically identical soils often result in different hydraulic properties, derived from either laboratory measurements or pedotransfer functions (PTFs). Additionally, flow mechanisms in sandy soils may also change through differences in water repellency associated with land use history. The soil water regimes for three sandy soils of the same taxonomic unit and under pasture but with differences in land use history were simulated. The land use histories were old grassland (site A), recently reseeded grassland (site B) and previous maize-cultivated land (site C). Degrees of water repellency, as indicated by the Water Drop Penetration Time (WDPT) test, were found to be highest for the topsoil of sites A and B. Initial simulations, using continuous pedotransfer functions to derive the Mualem–Van Genuchten parameters, corresponded poorly with field measurements (TDR). Additional laboratory measurements did not result in a better correspondence. Taking account of preferential flow in sites A and B, using the mobile/immobile concept, improved modelling performance significantly. Model simulations for a limited time period showed that water storage in the top 50 cm was on average 59 mm higher for site C compared with site A, and 23 mm higher for site B compared with site A. Downward fluxes at 50-cm depth were especially larger for site A compared with sites B and C.

Soil scientists in a changing world

Publisher Summary Science and technology in situ has changed its course along with social and economic developments. Although it has not always been beneficial to human beings, civilization has got the required mileage to drive information, culture, resources, and wealth throughout the world from one era to another. The awareness of soil goes right back to the start of our civilization. The ‘‘true’’ soil has been the favorite domain of the soil scientist, using ever more sophisticated methods to measure soil characteristics and to characterize dynamic soil processes. This has greatly expanded the knowledge about soils and been a major contribution to society at large as this knowledge was applied in many products and services. Effects of land use are difficult to predict in the same quantitative and unique manner in which, for example, a Cation Exchange Capacity (CEC) can be predicted because conditions are so diverse. There is no single magic answer to any given land‐use question because many stakeholders are involved with widely varying interests. The soil scientist should try to define the ‘‘true’’ soil as well as possible but should be modest and know his limits. Soil scientists have a major handicap: soils occur underground and are invisible except when excavated. Plants and animals are highly visible, at least partly explaining the viability of policies enforcing biodiversity. There are efforts now to define soil‐charters and the EU is working on soil policies.