Results 1 - 3 of 3
Results 1 - 3 of 3. Search took: 0.014 seconds
|Sort by: date | relevance|
[en] At present, most salt affected farm land shows a decrease in productivity, which in the worst scenarios, is translated into land abandonment. Saline agriculture pretends to make use of saline resources, soil or water depending on the local characteristics, through the use of salt tolerant crops and specific farming management. Salt Farm Texel (SFT) is working on the identification of tolerant crops, conventional vegetables and halophytes, which could be suitable to use in areas threatened by salinization. Its unique open-lab situated in the Netherlands consists of one hectare, where crops are irrigated with seven different salt concentrations (ECe 0.8, 4, 8, 12, 16, 20, 35 dS/m) in order to determine their level of tolerance. Since 2012, about 800 varieties of more than 50 crops (such as potatoes, brassicas, lettuce or legumes) have been tested and selected for its national or international implementation, as in Pakistan or Bangladesh. The results imply that salt affected areas have more potential than is commonly assumed. For instance, we have found potato, cabbage andcarrot varieties with a threshold three, four or even six times higher than FAO references. Using the varieties and techniques developed on the SFT, in Pakistan the yield on salt affected soils was 40 % higher than the national average, plus the use of fresh water was reduced by 50 %. In the coastal area of Bangladesh, 30 research demo-farms have been set up, in order to demonstrate and train to 5.000 farmers whom will benefit from the project. In many countries, farmers are not aware of the severity of the salinity effects, or they do not have the means or knowledge to take appropriate actions. The implementation focus on practical solutions that can easily be adopted by farmers. This includes local research and demonstration farms where farmers can observe and experience the potential of the saline agriculture methods. The successful large-scale implementation of saline agriculture not only contributes to food security, but can also reduce poverty, unemployment, malnutrition and climate migrations.
[en] The greenhouse effect is a hot topic. There are still major uncertainties about the effects on the climate of the increasing concentrations of greenhouse gases. Politicians and socioeconomic scientists thus sometimes have the feeling that they are building on quicksand, and this hampers the advancement of an adequate policy. It is therefore necessary to map out the uncertainties, and to reduce them. A method is presented for doing this. 5 refs., 5 figs
[en] Reversible logic plays a fundamental role both in ultra-low power electronics and in quantum computing. It is therefore important to know which reversible logic gates can be used as building block for the reversible implementation of an arbitrary boolean function and which cannot