Showing results for: Primary production: Agriculture
Agricultural production sits at the heart of major societal concerns, spanning food security, nutrition and health; livelihoods and development; the environment;and animal ethics. In early history, the farming of domesticated species created food surpluses that allowed for the development of sedentary civilisation. Later, the Green Revolution of the twentieth century allowed for large groups of people, especially in developed countries, to “move off the land” and improved food supplies across much of the world. Yet while innovations in modern agronomy, plant and animal breeding, pesticides and fertilizer use have greatly increased food output, much environmental harm arising from these practices has occurred while concerns are also growing around excess calories and poor nutrition, leading to obesity and associated non communicable diseases as well as micronutrient deficiencies. Many of the 1.3 billion people worldwide who rely directly or indirectly on agriculture for their living face problems arising from imbalanced power structures, including poor working conditions, uncertain land use and tenure, and lack of access to inputs, infrastructure, capital and knowledge; these imbalances play out along the whole of the food value chain, between the genders, within country populations and across countries and regions. As to the environment, agriculture is responsible for some 20% of global anthropogenic greenhouse gas emissions of which about half arise directly from crop and livestock production and the other half from agriculturally induced land use change. It is also the main cause of deforestation and biodiversity loss, a major user and polluter of scarce water resources and responsible for the disruption of global nitrogen and phosphorus cycles.
California agritech startup Iron Ox has unveiled an “autonomous farm”, where robots move plants and transplant them from one stage to the next. Artificial intelligence controls pests and diseases and adjusts growing conditions. The farm is not entirely automated, as humans still sow seedlings and package the harvested crops. The farm produces leafy greens and herbs.
The book “Changing the food game: market transformation strategies for sustainable agriculture”, written by Lucas Simons, discusses how markets can be changed to support a sustainable food system. Chapter topics include how food production impacts the world, market failures, and phases of market transformation.
The UK’s Department for Environment, Food and Rural Affairs has published “Health and Harmony: the future for food, farming and the environment in a Green Brexit” - a summary of the responses to its consultation.
Rice cultivation emits methane and nitrous oxide, which are both more potent greenhouse gases than carbon dioxide. Policies to reduce methane emissions from rice farming generally recommend using intermittent (as opposed to continuous) flooding. However, intermittent flooding could produce much higher nitrous oxide emissions than continuous flooding, according to a recent paper.
A traditional variety of corn grown by people from Sierra Mixe in southern Mexico can thrive in poor soils without needing much extra fertiliser. A group of researchers have shown that the plant is able to draw nitrogen from the air through mucus-laden aerial roots on its stems. It’s hoped that the trait can eventually be bred into commercial corn strains.
This book, edited by Ramesh Namedo Pudake, Nidhi Chauhan, and Chittaranjan Kole, highlights ways in which nanomaterials can be used in agriculture. The book covers both social and environmental aspects.
The Food and Agriculture Organisation of the United Nations has released the September 2018 version of its quarterly reports, “Crop prospects and food situation”. According to the report, 39 countries currently require external food assistance, driven by conflicts and climate-related shocks. Of those countries, 31 are in Africa, seven are in Asia, and the remaining one is Haiti. World cereal production in 2018 is estimated to be 2.4% lower than in 2017, which saw a record high.
Birds catch insects less frequently in silvopastures (grazing land with substantial tree cover) than in forest fragments, according to a study in the Colombian Andes. This suggests that silvopasture provides relatively lower quality habitat for the bird species studied. However, the paper proposes some measures to improve the quality of silvopastures as habitats for birds, including encouraging certain tree species and forming particular microhabitats, such as vine tangles and hanging dead leaves.
The flooding caused by Hurricane Florence in North Carolina has drowned millions of chickens and thousands of pigs that were left on farms during the storm. The floodwaters have also caused at least 13 manure storage lagoons to overspill, spreading potentially dangerous bacteria and excess nutrients to the surrounding areas.
The UK government has published its Agriculture Bill, which reforms how farmers will receive subsidies. Under the current system - the European Union’s Common Agricultural Policy - the amount of money that farmers receive is linked to the amount of land that they farm. Under the new system, payments will be linked to producing “public goods” such as protecting habitats, reducing flood risk and improving water quality.
If the US were to shift to entirely grass-finished beef (vs. grain-finished), then the US cattle population would have to increase by 30% relative to today, because grass-fed cattle gain weight more slowly than those fattened in feedlots. Furthermore, existing pastures would have to become 40%-370% more productive to avoid converting more natural habitat to farmland or competition with human food supply. Methane emissions from the cattle’s digestive systems might increase by 43%, again because of slower growth rates.
Writing in the Guardian, Isabella Tree of Knepp Castle Estate argues that vegan diets ignore the potential of wildlife-friendly livestock grazing methods. Tree claims that not using anti-worming agents or antibiotics allows cow dung to feed various soil organisms, contributing to soil restoration and wildlife diversity.
New Zealand’s Parliamentary Commissioner for the Environment has released a report exploring how much and over what timescale the climate is affected by methane emissions from livestock. It focused on two questions. First,if methane emissions from livestock were held at current levels or followed business-as-usual trajectories, what would their contribution to future warming be? Second, what reduction in methane emissions from livestock would be needed so that they cause no additional contribution to warming?
The World Wildlife Fund has released a report measuring on-farm crop waste at various locations in the United States. During the 2017-18 growing season, 40% of tomatoes, 39% of peaches, 2% of potatoes and 56% of romaine lettuce were left in the field. Causes of waste at the farm stage include strict quality standards, damage due to weather, variable consumption patterns and unpredictable labour supply. Some growers pointed out, however, that the nutrients in on-farm waste food are almost always recycled, e.g. as animal feed or by ploughing the waste back into the field.
A new paper reviews the extent to which sustainable intensification has been achieved in England. It concludes that agricultural intensification drove environmental degradation during the 1980s. In the 1990s, however, yields became decoupled from fertiliser and pesticide use, meaning that some ecosystems services began to recover. The authors interpret their results as meaning that sustainable intensification has begun. Farmland biodiversity, however, has not recovered.
These two books, edited by Debashis Mandal, Amritesh C. Shukla and Mohammed Wasim Siddiqui, outline current trends in research on sustainable horticulture. Volume 1 covers diversity, production, and crop improvement while Volume 2 covers food, health, and nutrition.