With the objective of selecting and make available for the Basic Grains Program the promisory germ-plasm of rice, with high potentials for yields, resistant or tolerant to fungi-caused diseases, particularly piricularia (leaf blast), good plant architecture and adapted to different eco-systems in El Salvador. The study was implemented in two different surroundings: the Center for Technological Development in Izalco and the Center for Technological Development in San Andres, using the dry method. We evaluated 91 materials in simple lattice of 10 by 10, with two replicates. Two lots were sowed using six furrows with a lenghth of five meters each, separated by 0.30 meters. We used as indicator the commercial varieties X-10, CENTA A-4, CENTA A-5 and the elite lines L-1951, and L- 1956. The results we obtained were subjected to analysis for variation and selection index, identifying the best 15 materials by their yield, their vegetative cycle, and their reaction to diseases. The outstanding lines were elite L-1956 (5.7 t/Ha), used as indicator, and other lines: CT-8889-10-16-2-1-M, C-109 Cu83-SmCu-11Cu-5CU-1CU-MS, C145Cu82- SmCu-SmNa7Cu-4Cu, 3Cu-2Cu-MS, with yields of 5.6, 5.5. and 5.4. (t/Ha) respectively; all this surpassing the commercial indicator with largest production, CENTA A-5, which yielded 5.2 t/Ha. We recommend the evaluation of selected materials, in yielding assays.
Exact Euler–Maclaurin formulas for simple lattice polytopes
