Over the years, chemical fertilisers have been applied to soil in order to increase their fertility. However over or under application of fertilisers can damage the crop yield and also cause serious ecological concerns. Soil testing thus acquires an important place in farming, specifically in site specific crop management. Non-destructive in-situ measurements of soil nutrients with cost effective optical sensing methods can help in determining and monitoring the nutrient levels in the soil.
With an ever increasing population, the demand for crop production has also increased exponentially in the past few years. According to the UN Food and Agriculture Organisation, global food demand will be 70 per cent more in 2050 than it was in 2006 (FAO, 2009). This has imposed enormous challenges on the agricultural sector to find ways to optimise the yield while addressing barriers such as limited land and water supply, ecological concerns, health issues and climatic changes. These issues has led to the concept of smart farming also known as precision agriculture—an information intensive management strategy where production inputs such as fertilisers are matched with the site specific needs of the crops. Characterisation of soil nutrients is an integral part of the diagnosis of soil quality with reference to its fertility. Conventional chemical and laboratory techniques are labourintensive, time consuming and very expensive. So, there is an urgent need for smart farming techniques such as precision agriculture.
Soil nutrients are vital for plant growth. Deficiency as well as excess of these nutrients may impede productivity. Chemical fertilisers are added to soil to meet up the nutrient requirements of plants. However, the uncontrolled addition of these substances can cause severe environmental hazards such as surface and ground water pollution and also affect the quality of the crop (Lehmann and Grisel, 2014). As such, a lot of attention has been focused in this area in recent years, particularly in precision agriculture and site specific management procedures for obtaining localised ‘on the go’ measurement of nitrogen (N), phosphorous (P) and potassium (K) in any soil. These components represent the three most important nutrients in agriculture and are the prime ingredients in almost all fertilisers.
この記事は Geography and You の May/June 2017 版に掲載されています。
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この記事は Geography and You の May/June 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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Covid-19: Politics Of Knowledge, Public Health And The World Order
In the present era of a knowledge society, the world order will be shaped more than ever before by the politics of knowledge. In the post-CoVId world, public health knowledge is likely to be a significant contributor. This article briefly discusses the various contemporary public health approaches evident within the discipline: global health, community medicine and critical public health. Then it goes on to analyse country level policy approaches to the COVID-19 pandemic, delineating a tentative four-category typology, based on available information. Finally, it sets out the possible outcome indicators that should be used to assess the national responses.
WILD MEAT AND WET MARKETS: A GLOBAL DIALOGUE
Wet markets operate in most Asian countries including India. China reported its wet markets as the epicentre of the Covid-19 outbreak in Wuhan and also more recently in Beijing. These wet markets, a traditional part of popular local culture in Asian countries, are increasingly becoming a cause of concern for the international community and health practitioners across the globe. This article attempts to understand how global authorities and their Asian partners are looking to regulate these infamous wet markets to significantly lower the risk of viral and other pathogenic load from these unhygienic wet markets.
SEA WALL IN THE MALDIVES AND ITS SUSTAINABILITY
The Small Island developing states are particularly vulnerable to the peril of climate change. Sea level rise, increase in sea surface temperature, high incidences of drought and flood are some of the vulnerabilities that loom large over such island states.The republic of Maldives is one such example, which has been publicly advocating for the reduction in greenhouse gas emissions. Despite being one of the least contributors to such emissions, the Maldives faces the highest impact of global warming. Being one of the lowest-lying island nations, it has been undertaking various steps to curb the egregious impacts of environmental catastrophes.One of the response measures taken by the Maldives is the construction of seawalls. This article discusses this, while accenting the drawbacks and benefits associated with the approach.
TO PLUCK AT WILL: FRUIT TREES IN COMMON PROPERTY
Despite many governmental initiatives, malnutrition in India remains a major health challenge. There is a marked deficit of fruits in the diet of most Indians, consuming much lower than what is recommended by the World health organisation (Who). One of the reasons behind this is the high price of fruits and thus its inequitable access. As we prepare ourselves to live in a world marred by COVID-19 and a shrinking Indian economy, we must think of new ideas to manage access to food, especially micro nutrient rich fruits. This paper explores the possibility of planting endemic fruit trees in public spaces like roadsides and parks, that can help in increasing the consumption of fruits amongst the poor. It also attempts to analyse whether this can serve as a long term solution to bridge the gap between fruit production and consumption in India.
RESPONSIVE URBAN PLANNING: COVID-19 A TURNING POINT FOR REAL CHANGE IN INDIAN CITIES
The global challenge of COVID-19 is still unfurling. States are grappling to control its remorseless spread with varied success and its impact both on long and short-term scales are still being understood. However, a distinct urban bias in its spread across the globe and universal response of lockdown and social distancing for its control has brought pertinent questions to the fore. Urban planning and the future of our cities in terms of urban life and city form therefore needs to be revisited. In India, the exodus of migrant workers from its large cities has added yet another dimension to this challenge.
PAUSE AND REBOOT
REFLECTIONS ON ECONOMY, SOCIETY AND POLITY DURING COVID-19 GLOBAL PANDEMIC AND LESSONS FOR INDIA
Migrants & borders: My wishlist in a post-Covid-19 world
Former Professor of Economics and Education, School of Social Sciences, Jawaharlal Nehru University, New Delhi. bkhadria@gmail.com.
Inequalities in Access to Academic Spaces
Experiences of students from the socially excluded groups in higher education in India
Understanding Caste and Class - Categories and Measurement
The caste has been a unique social institution in India. It has also emerged in a new form after the mandalisation of caste in the early 1990s resulting in the extension of reservation to Other Backward Classes (OBCs) in government jobs and also in admissions to colleges and universities. The relative size of population of various caste groups particularly of the OBCs is also a matter of debate. Census does not provide population data on OBCs, however, it is possible to assess it from nationally representative sample surveys. Further, the correspondence between caste categories and class has been a matter of debate. This paper presents an assessment of class within caste categories based on data from nationally representative sample surveys.
The Middle Class - As the Class of No Class
An attempt to understand some of the ambiguities around what it means to be middle class in India has been made in this paper. It also discusses the influence that the middle class supposedly has on Indian politics despite these uncertainties.
