نتایج جستجو برای: agricultural yields

تعداد نتایج: 194172  

2014
Aiping Zhang Ruliang Liu Ji Gao Shiqi Yang Zhe Chen

High N fertilizer and flooding irrigation applied to rice on anthropogenic-alluvial soil often result in N leaching and low recovery of applied fertilizer N from the rice fields in Ningxia irrigation region in the upper reaches of the Yellow River, which threatens ecological environment, food security, and sustainable agricultural development. This paper reported the regulating N application fo...

2015
J. Elliott C. Müller D. Deryng J. Chryssanthacopoulos K. J. Boote M. Büchner I. Foster M. Glotter J. Heinke T. Iizumi R. C. Izaurralde N. D. Mueller D. K. Ray C. Rosenzweig A. C. Ruane J. Sheffield

We present protocols and input data for Phase 1 of the Global Gridded Crop Model Intercomparison, a project of the Agricultural Model Intercomparison and Improvement Project (AgMIP). The project includes global simulations of yields, phenologies, and many land-surface fluxes using 12– 15 modeling groups for many crops, climate forcing data sets, and scenarios over the historical period from 194...

Journal: :Agricultural history 2011
Mark D Hersey

Though they are often seen as foils for each other, ecology and agricultural science co-evolved. With shared roots in late nineteenth-century botany, ecologists and agronomists fostered important connections during the Progressive era that have been largely overlooked despite a number of finely nuanced studies of ecology's origins. But if 'applied ecology' once effectively meant agriculture, ov...

1999
Miguel A. Altieri Peter Rosset

Advocates of biotechnology affirm that the application of genetic engineering to develop transgenic crops will increase world agricultural productivity, enhance food security, and move agriculture away from a dependence on chemical inputs helping to reduce environmental problems. This paper challenges such assertions by first demystifying the Malthusian view that hunger is due to a gap between ...

2011
Allen G. Good Perrin H. Beatty

Globally, we are applying excessive nitrogen (N) fertilizers to our agricultural crops, which ultimately causes nitrogen pollution to our ecosphere. The atmosphere is polluted by N₂O and NO(x) gases that directly and indirectly increase atmospheric warming and climate change. Nitrogen is also leached from agricultural lands as the water-soluble form NO₃⁻, which increases nutrient overload in ri...

2014
David J. Spielman Deepthi E. Kolady Anthony Cavalieri N. Chandrasekhara Rao

Since the late 1980s, technological advances and policy reforms have created new opportunities for private-sector investment in India’s seed and agricultural biotechnology industries. These changes have had a significant impact on cotton yields and output in India, but less so for rice and wheat—the country’s main cereal staples—for which yield growth rates are tending toward stagnation. This a...

Journal: :Environmental Health Perspectives 1994

0^ Agricultural Chemicals Although agricultural chemicals improve crop yields, increase the quality of the American diet, and contribute to improvements in public health, there is growing public concern about their human health effects. Agricultural chemicals are usually mixtures of chemicals, some of which can damage the environment and accumulate in ecosystems. Depending on dose, some agricul...

2016
Martin Wiesmeier Christopher Poeplau Carlos A. Sierra Harald Maier Cathleen Frühauf Rico Hübner Anna Kühnel Peter Spörlein Uwe Geuß Edzard Hangen Bernd Schilling Margit von Lützow Ingrid Kögel-Knabner

Climate change and stagnating crop yields may cause a decline of SOC stocks in agricultural soils leading to considerable CO2 emissions and reduced agricultural productivity. Regional model-based SOC projections are needed to evaluate these potential risks. In this study, we simulated the future SOC development in cropland and grassland soils of Bavaria in the 21(st) century. Soils from 51 stud...

2017
Xiang Zhao Xiaoya Ma Kun Wang Yuqing Long Dongjie Zhang Zhanchun Xiao

Using agricultural straw to generate electricity is an effective approach for relieving the pressure of procuring a reliable energy supply and reducing environmental pollution. Because the locations of the power plants have a significant impact on the supply of raw materials and the cost of transportation, it is important to choose reasonable locations for power plants. To solve the problem of ...

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