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crop varieties
A possible method of manipulating allelopathy would be to develop crop varieties showing an increased tolerance to allelopathic chemicals.
      
The potential of exploiting unadapted and wild germplasm via advanced backcross QTL analysis for the enhancement of elite crop varieties is discussed.
      
Hence, genetic engineering for developing stress tolerant plants, based on the introgression of genes that are known to be involved in stress response and putative tolerance, might prove to be a faster track towards improving crop varieties.
      
The results showed that long-term triple cereal cropping has a high and stable grain yield level if certain improved crop varieties are used.
      
In former times there were only small cultivation areas in Saudi Arabia consisting of native crop varieties which were large resistant to pests and diseases.
      
There is increasing interest in the development of allelopathic crop varieties for weed suppression.
      
The results of the various trials and the observations gathered from different sources have shown that the Columbia Russet is one of the earliest of the main crop varieties and has considerable promise as a good yielder.
      
Also, the availability of modern agricultural seeds had reduced the planting frequency of indigenous crop varieties.
      
Recently conservation of folk crop varieties for direct use by the farmer-breeders of traditional agricultural communities has been suggested as another purpose for CGR conservation.
      
For each of these concepts we suggest questions for research on farmers'plant breeding (farmers' knowledge, practice, and crop varieties and growing environments).
      
The occurrence of greenbug,Schizaphis graminum (Rondani), biotypes is a constant threat to the development and stability of pest-resistant cereal crop varieties.
      
In the context of the mulch technology, new low-input crop varieties were screened and their response to fertilizer was studied.
      
Biodiversity and modern crop varieties: Sharpening the debate
      
Adaptation strategies that consider changes in crop varieties or in the timing of agricultural activities imply low costs and, if readily undertaken, can compensate for some of the yield loss simulated with the climate change scenarios.
      
For example, crop varieties grown in the Sahel may not be able to withstand the projected warming trends and will certainly be at risk due to projected lower amounts of rainfall as well.
      
In breeding crop varieties for stress environments, it must be decided whether to select directly, in the presence of stress, or indirectly, in a nonstress environment.
      
This may explain why crop varieties bred under high-yielding conditions failed to have an impact in low-yielding agricultural systems.
      
Tolerance to high levels of boron in the soil is an important aspect of the adaptation of crop varieties to southern Australian conditions.
      
Inter-site transferability of crop varieties: another approach for analyzing multi-locational variety trials
      
Improved crop varieties developed at experimental stations are intended for release for production in farmers' fields which are not necessarily the test sites.
      
 

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