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Background: Introducing new crops to reduce the nutritional gap in Egypt is an important target. One of these crops is Quinoa which is characterized by high nutritional value with multiple food uses. However, it will compete with other winter crops, so it is candidate to grow in marginal lands like calcareous soils. Meanwhile, planting density and N requirements are not known under such conditions; therefore, this work was undertaken in calcareous soil Caco3 > 50%. Methods: The experiments included three nitrogen fertilization treatments (0, 50 and 100 kg/fed.) and two plant densities (20,000 plants/fed. and 36,000 plants/fed.) on Quinoa (Chenopodium quinoa Willd.) cv. Shibaya Field over two consecutive winter seasons of 2018/2019 and 2019/2020 in calcareous soil. Quinoa seed yield, biological yield, straw yield, weight of 1000-seed, harvest index, total nitrogen percentage in seeds, crude protein content in seeds, phosphorus content in seeds and potassium percentage in seeds were determined. The experimental design was a split plot design with three replications. Results: The results showed that applying nitrogen fertilization at a rate of 100 kg/fed. had significantly greater seed yield, biological yield, seed yield, straw yield and weight of 1000-seed. All seed chemical contents except K percentage were significantly affected due to nitrogen fertilization. Increasing plant density from 20,000 to 36,000 plants per feddan significantly increased the biological yield, seed yield, straw yield, weight of 1000-seed and harvest index. The interaction between the two studied factors was significant on all characters of this investigation except, K percentage in seeds. Conclusion: It can be concluded from this study that the quinoa crop responds to the increase in nitrogen fertilization and increases productivity and quality when fertilized with a rate of 100 kg nitrogen per fed. [ABSTRACT FROM AUTHOR]

A filed experiment was carried out at a private farm located at Qaha District, Qalubayia governorate, Egypt, during the two successive summer seasons of 2018 and 2019 to evaluate growth and productivity of seven new dry bean genotypes (DB-2-435, DB-5-485, DB-5-486, DB-5-487, DB-5-489, DB-7-4 and DB-7-31) in additional to three commercial cultivars (Giza 3, Giza 6 and Nebraska) under different plant densities, i.e., 5 cm one row, 10 cm one row, 5 cm 2 rows and 10 cm 2 rows/ridge. These treatments were arranged in a split plot in a randomized complete block design with three replications. Plant densities were randomly distributed in the main plot and genotypes were randomly arranged in the sub plot. As average two seasons, sowing seeds of genotypes DB-5-485, DB-5-487, DB-5-489 at 10 cm on one side increased number of branches/plant, leaf area/plant, dry weight/plant and total chlorophyll in leaf tissues, followed by the interaction between sowing at 10 cm on one side and Nebraska cultivar regarding total chlorophyll in both seasons. In general, the interaction between sowing at 10 cm on one side and Nebraska cultivar or genotype DB-5-485 increased number of seeds/pod, yield/plant in both seasons. Respecting total yield, the interaction between sowing at 5 or 10 cm on two sides and Nebraska cultivar or the genotype DB5-485 gave the highest values of total yield /fed., however, the interaction between sowing at 5 cm on one row and DB-5-486 genotype gave the lowest total yield/fed. (0.781 ton/fed.) as average of two seasons. [ABSTRACT FROM AUTHOR]