خيارات البحث
النتائج 2131 - 2140 من 2,193
The role of the West African dwarf goat in the economy of the smallholder arable farmer in the subhumid zone of Nigeria النص الكامل
1993
Ikwuegbu, O.A. | Tarawali, G. | Njwe, R.M.
This study analysed 875 records of West African Dwarf (WAD) goats owned by 45 farmers and collected over 30 months. In the wet season WAD goats had access to either fodder banks or natural pasture. After crop harvest, animals roamed freely. Litter sizes were 1.67 + 0.08 and 1.56 + 0.06, respectively, on the two grazing systems and were affected by parity (P<0.05). Births accounted for 87% of all entries while multiple births accounted for about 68 % of all kids. Castrates accounted for about 60% of all mature males. Between 35 and 39% of adult goats were sold for meat and offtake accounted for between 51 and 53 % of all exits. Sufficient cash was generated from goat offtake to purchase farm inputs and some household items. Goats play other important roles in the socio-economy of the traditional smallholder farming system.
اظهر المزيد [+] اقل [-]Mahatma Gandhi National Rural Employment Guarantee (MGNREGA) Programme in India: A review of studies on its implementation performance, outcomes and implications on sustainable livelihoods across states النص الكامل
2014
Viswanathan, P. K. | Mishra, Rudra Narayan | Bhattarai, Madhusudan | Iyengar, Hema
Nonpoint-source pollution control and greening of China’s agrifood systems النص الكامل
2021
Gong, Binlei | Chen, Kevin Z. | Fang, Xiangming | Meng, Ting | Zhou, Li | Shi, Minjun | Wang, Shuo
The unsustainable agricultural production mode of “high input and high output” has imposed a heavy burden on China’s ecosystems, and severely restricted the sustainable development of the country’s agrifood systems. Taking long-term prevention and control of agricultural nonpoint-source pollution as the key approach can play an important role in upgrading country’s agriculture to circular and renewable agriculture-food-ecological system circulation. Currently, the five major sources of agricultural nonpoint-source pollution in China are livestock, poultry and aquaculture; chemical fertilizers; pesticides; crop residues; and waste plastic films. The Chinese government has issued corresponding policies and measures to carry out prevention and control at the source and end, which have achieved initial results. Its accurate grasp of direction and implementation provide lessons for other developing countries. Several years of treatments have resulted in remarkable reduction of nitrogen and phosphorus emissions from the livestock and poultry farming, but the pollutant emissions of the aquaculture are increasing, and the utilization rate of chemical fertilizers and pesticides is still relatively low compared with that of developed countries. China mainly relies on policies and legal means, and government subsidies to control agricultural nonpointsource pollution in the short term. However, more emerging options should be explored to establish a long-term mechanism to prevent and control agricultural nonpoint-source pollution and to transform the agrifood systems to become even greener, including property rights arrangements, interprovincial ecological compensation, green finance, and brand building for ecological agricultural products.
اظهر المزيد [+] اقل [-]Transforming agrifood systems to achieve China’s 2060 carbon neutrality goal النص الكامل
2021
Zhang, Yumei | Fan, Shenggen | Chen, Kevin Z. | Feng, Xiaolong | Zhang, Xiangyang | Bai, Zhaohai | Wang, Xiaoxi
During recent decades, agriculture has developed rapidly in China, ensuring food security and enriching residents’ diets. At the same time, greenhouse gas (GHG) emissions from the country’s agrifood systems have increased by only 16 percent in the past two decades and fell for two consecutive years in 2017 and 2018. The proportion of GHG emissions in the country’s food systems to the total GHG emissions dropped from 18.7 percent in 1997 to 8.2 percent in 2018. GHG emissions from the Chinese agrifood systems should not be ignored, neverthless. In 2018, GHG emissions from agrifood systems was still as high as 1.09 billion tons CO2eq1. While ensuring food security as the national top priority, measures such as improving agricultural technologies, reducing food loss and waste, and shifting dietary patterns must be adopted to reduce GHG emissions from agrifood systems. Improvements in agricultural technologies are the most effective standalone measures, but the combined three measures above have the most significant effect on GHG emission reduction. Projections show that the combined three measures can redcue GHG emissions by 47 percent in 2060 from the 2020 level. Land use, land use change, and forestry (LULUCF) play a key role as a carbon sink. The carbon sequestration from LULUCF was around 1.1 billion tons CO2eq in 2014. It can increase to 1.6 billion tons of CO2eq per year in 2060, thus LULUCF could completely offset GHG emissions from agrifood systems and still have a surplus capacity to sequester nearly 1 billion additional tons of CO2eq per year, well above the current level of net sequestration,contributing to overall carbon neutrality of China.
اظهر المزيد [+] اقل [-]Transforming agrifood systems to achieve China’s 2060 carbon neutrality goal النص الكامل
2021
Zhang, Yumei | Fan, Shenggen | Chen, Kevin Z. | Feng, Xiaolong | Zhang, Xiangyang | Bai, Zhaohai | Wang, Xiaoxi
During recent decades, agriculture has developed rapidly in China, ensuring food security and enriching residents’ diets. At the same time, greenhouse gas (GHG) emissions from the country’s agrifood systems have increased by only 16 percent in the past two decades and fell for two consecutive years in 2017 and 2018. The proportion of GHG emissions in the country’s food systems to the total GHG emissions dropped from 18.7 percent in 1997 to 8.2 percent in 2018. GHG emissions from the Chinese agrifood systems should not be ignored, neverthless. In 2018, GHG emissions from agrifood systems was still as high as 1.09 billion tons CO2eq1. While ensuring food security as the national top priority, measures such as improving agricultural technologies, reducing food loss and waste, and shifting dietary patterns must be adopted to reduce GHG emissions from agrifood systems. Improvements in agricultural technologies are the most effective standalone measures, but the combined three measures above have the most significant effect on GHG emission reduction. Projections show that the combined three measures can redcue GHG emissions by 47 percent in 2060 from the 2020 level. Land use, land use change, and forestry (LULUCF) play a key role as a carbon sink. The carbon sequestration from LULUCF was around 1.1 billion tons CO2eq in 2014. It can increase to 1.6 billion tons of CO2eq per year in 2060, thus LULUCF could completely offset GHG emissions from agrifood systems and still have a surplus capacity to sequester nearly 1 billion additional tons of CO2eq per year, well above the current level of net sequestration,contributing to overall carbon neutrality of China.
اظهر المزيد [+] اقل [-]Nonpoint-source pollution control and greening of China’s agrifood systems النص الكامل
2021
Gong, Binlei | Chen, Kevin Z. | Fang, Xiangming | Meng, Ting | Zhou, Li | Shi, Minjun | Wang, Shuo
The unsustainable agricultural production mode of “high input and high output” has imposed a heavy burden on China’s ecosystems, and severely restricted the sustainable development of the country’s agrifood systems. Taking long-term prevention and control of agricultural nonpoint-source pollution as the key approach can play an important role in upgrading country’s agriculture to circular and renewable agriculture-food-ecological system circulation. Currently, the five major sources of agricultural nonpoint-source pollution in China are livestock, poultry and aquaculture; chemical fertilizers; pesticides; crop residues; and waste plastic films. The Chinese government has issued corresponding policies and measures to carry out prevention and control at the source and end, which have achieved initial results. Its accurate grasp of direction and implementation provide lessons for other developing countries. Several years of treatments have resulted in remarkable reduction of nitrogen and phosphorus emissions from the livestock and poultry farming, but the pollutant emissions of the aquaculture are increasing, and the utilization rate of chemical fertilizers and pesticides is still relatively low compared with that of developed countries. China mainly relies on policies and legal means, and government subsidies to control agricultural nonpointsource pollution in the short term. However, more emerging options should be explored to establish a long-term mechanism to prevent and control agricultural nonpoint-source pollution and to transform the agrifood systems to become even greener, including property rights arrangements, interprovincial ecological compensation, green finance, and brand building for ecological agricultural products.
اظهر المزيد [+] اقل [-]Selecting a cooperative membership structure for the agriculture-of-the-middle initiative النص الكامل
2009
Mechanized systems for planting and harvesting cassava (Manihot esculenta Crantz)
2012
Ospina Patiño, Bernardo | Cadavid López, Luis Fernando | García, Martha | Alcalde, César
On the feasibility of an agricultural revolution: Sri Lanka’s move to go 100% organic النص الكامل
2023
Drechsel, Pay | Madhuwanthi, Piumi | Nisansala, Duleesha | Ramamoorthi, Dushiya | Bandara, Thilini
In April 2021, the Sri Lankan Government banned imports of agrochemicals, including chemical fertilizers, to make Sri Lanka the first fully organic and chemical fertilizer-free country globally. The ban was justified by human and environmental health concerns, such as many cases of kidney failure in the central parts of Sri Lanka. While previous policies had envisioned a stepwise transition, the sudden ban jolted the agriculture sector. However, it was aligned with the emerging national economic crisis with drastically declining foreign exchange reserves that restricted the import of commodities, including fertilizer for distribution at subsidized prices. The ban was also opportune because fertilizer prices peaked on international markets in 2022. Without any transitional time, the thrust for organic fertilizers failed to satisfy demand or obtain the required crop nutrients resulting in severe agricultural losses. After the first data on decreasing yields were revealed, the government lifted the chemical fertilizer ban on December 1, 2021, but it was too late as the cropping season had arrived. Without financial reserves to import fertilizer, the donor community was urged to assist. This paper addresses: (1) justification of the ban, (2) the feasibility of transitioning to organic fertilizers based on the available biomass to replace chemical fertilizers; and (3) the related cost implications. The scenarios focus on irrigated paddy rice and the plantation sector that underpin the national economy. Undervalued nutrient sources are also considered as well as the constraints to and implications of such a transition beyond Sri Lanka’s frontiers.
اظهر المزيد [+] اقل [-]Natural cassava drying systems
2012
Ospina Patiño, Bernardo | Best, Rupert | Alonso Alcalá, Lisímaco