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Front. Plant Sci. | doi: 10.3389/fpls.2019.00346

Editorial: Options for Transition of Land Towards Intensive and Sustainable Agricultural Systems

  • 1Norwegian Institute of Bioeconomy Research (NIBIO), Norway

Development of agricultural practices must be in accordance with the “Great Challenges” for the 21st century, for which soil and water protection are key factors. There is no single solution to these enormous challenges but efforts need to be made on all frontiers to feed our growing population and provide it with bio-based raw materials. Modern agriculture must adapt to fulfil these demands in a sustainable way. The main factors governing agroecosystem productivity are soil, water, balanced nutrients input and a correct land management. In this context, adaptations to climate change must be addressed. Low water availability in Mediterranean arid and semi-arid conditions is one of the main threats for cropland. On the other hand, soils that today may be rather marginal because of cool summer climates, may become important for future food, feed or industrial crops production if water is not limiting the production. The present research topic focuses on marginal land that can be considered for environmentally sound production of biomass or other marginal goods avoiding the use of good soil for this purpose.

Soils in many places are degraded to a stage where it takes long time to recuperate these resources, especially in contaminated areas. Thousands of sites in Europe have been declared as polluted with trace elements, and excluded from agricultural production. As a possible solution, Kidd et al. (LINK) reports the adequate fertilization regimes; plant cropping patterns and plant microbial and fungal interactions and the biomass processed for Ni recovery. Mench and coworkers report a successful sunflower—tobacco crop rotation for copper removal (LINK), and Thys et al. contribute results on the slow removal of Cd, Zn and Pb from diffusely polluted soils by phyto-management using energy plants in a short rotation strategy (LINK).
It is a paradox that nutrients that may be very scarce in the near future, as P and N, are dispersed in far too large quantities, especially in areas with livestock production causing severe environmental problems. Resource depletion may also lead to price tensions with an impact on food security. Furthermore, some conventional agriculture practices represent a threat to sustainability of the long-term productivity. New methods, in line with principles of bioeconomy and circular economy models, spur the use of organic wastes as raw material for fertilizer and soil amendments. Ghaley et al. (LINK) simulated soil organic carbon effects on winter wheat under different N-fertilizer amounts, using long term data from an experiment in Denmark. They concluded that agronomic productivity was enhanced by soil organic carbon build up when N-rates were in the range of 0 – 100 kg N ha-1, but not when N-fertilization was higher. Reichel and coworkers scrutinized the role of carbon source for the microbial storage or release of N compounds from arable land. They found that N immobilization by incorporated straw and sawdust may be more important for storage of excess N than microbial N immobilization over a growth period whereas pure lignin did not stimulate microbial N immobilization. Regarding biochar production from feedstocks, it is necessary to establish critical factors for their application as soil amendments. Marmiroli et al. (LINK) found that the feedstock type determined biochar microstructure and elemental composition, which were linked to toxicity: biochar from animal origin were phytotoxic at lower concentrations than those from plant feedstock.
Synthetic fertilisers are annually 11.4 million tonnes of nitrogen and 1.1 million tonnes of phosphorus in EU-28. Meanwhile, between 118 and 138 million tonnes of biowaste are produced annually, but only about 25% is effectively recycled into compost and digestate. Fortunately, there is an increasing awareness that recycling of nutrients and organic matter is essential for creating sustainable food and non-food value chains. Energy crops and residues may be one option for more efficient use of biomass. Weiss and Glasner (LINK) addressed how to sort out fractions that have negative impact on incinerators, by decreasing the chlorine content of the biomass of wheat chaff.
To prevent environmental pollution and ensure safety related to the uncontrolled application of inadequate amendments for agricultural purposes, updating of the regulations are being enforced on international level. In this context, a study investigating the effects of N sources and tillage practices on NH3 volatilization, grain yield and nutrient use efficiency (NUE) from paddy fields in central China is of high interest (Liu et al. LINK). Furthermore, Van Duijinen et al., (LINK), found that N fertilizers affected wheat yield most but also pre-crops were important, and plants with N-fixing bacteria had a better effect on barley yield than mycorrhiza associated pre-crops. Improving fertility of marginal soils for the sustainable production of biomass is a strategy for reducing land use conflicts between food and energy crops as it is shown by Nabel et al. (a) (LINK). They demonstrate that the intercropping of legumes, can stimulate the yield of S. hermaphrodita on marginal soils for sustainable plant biomass production. Further on, Nabel et al. (b) scrutinized the role of depot fertilization (LINK). This technique promoted a deep reaching root system of S. hermaphrodita seedlings with a dense root cluster around the depot-fertilized zone, resulting in fivefold increased biomass yield.
A big problem is fodder, water and resource use for cattle growth. When forage production, feed intake, and animal performance of abandoned grassland before and after the common practice of rangeland grazing were compared, it became clear that extended spring grazing on abandoned grassland would improve lamb performance. Quantifying these aspects of reintroducing abandoned grassland into sheep farming gives both sheep farmers and land owners a knowledge basis for valuing the area in monetary terms and for decision-making (Steinshamn et al. 2019 LINK).
New methods and technologies are needed, implementing remote sensing tools and drones, the use of precise methods and unmanned vehicles and transfer to smaller and smarter machines that are precisely guided. We must avoid destruction of soil structure, which encompasses a multitude of soil organisms important for soil functioning. Furthermore, crop rotation, intercropping, improved soil amendments, cultivar selection and irrigation methods need to be adapted for each specific situation. Finally, agricultural wastes must be investigated for their usability. Current research shows that we have many options and solutions that must be followed up and further developed to technology readiness (Schroeder et al., 2018). In this context, poor, contaminated and dry soils may have to be re-activated in order to increase soil quality and soil potential for food, feed and other biomass production (Mench et al., 2018; Marmiroli et al., 2018 (LINK).

Keywords: Sustainable intensification, food production, biomass, Soil Amendments, Fertilizers

Received: 04 Mar 2019; Accepted: 07 Mar 2019.

Edited by:

Sergio J. Ochatt, INRA UMR1347 Agroécologie, France

Copyright: © 2019 Sæbø. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Arne Sæbø, Norwegian Institute of Bioeconomy Research (NIBIO), Oslo, Norway, arne.sabo@nibio.no