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Articles by Mehmet Yildirim
Total Records ( 2 ) for Mehmet Yildirim
  Cuma Akinci and Mehmet Yildirim
  Barley (Hordeum vulgare L.) landraces display a high degree of variability in morphological and developmental traits, in disease resistance, and in protein content. Representatives of 29 barley landraces from southeast Turkey were collected from farmers′ fields, for a total of 800 accessions. The objectives of this study were to characterize these accessions over four years for morphological and agronomical traits to be used for future selection and breeding program. The observed variation between landraces was very large for all traits. In the first year of testing the accessions showed average grain yields ranging from 197-2225 kg ha-1. After three years of selection, promising accessions were tested at two different geographical regions and using two different irrigation methods. One line was identified which significantly out-yielded the local landrace in all of the testing years and had a higher average yield than the check genotypes.
  Ismail GUL , Mehmet YILDIRIM , Cuma AKINCI , Ilhan DORAN and Hasan KILIC
  The use of legume crops in maize rotation systems may decrease the need for nitrogen (N) fertilization and increase total output. The effect of previous crops (wheat, barley, lentil, Hungarian vetch, and fallow) and different N fertilization rates (0, 120, 160, 200, and 240 kg of N ha-1) on yield and N content of silage maize (Zea mays L.) were evaluated under irrigated conditions in Diyarbakýr, Turkey, during the 1999-2000, 2000-2001, and 2001-2002 growing seasons. Dry matter yield varied between 10,068.2 and 16,480.4 kg ha-1. It was determined that Hungarian vetch was a suitable rotation crop, and that 200 kg of N ha-1 was the best N fertilization rate for silage maize production across years and N rates. Moreover, according to the previous crop × N fertilization rate interaction, the highest dry matter yield was obtained from 240 kg of N ha-1 after barley. Silage maize following Hungarian vetch in rotation did not respond to the application of more than 120 kg of N ha-1, in terms of dry matter and N yields, while in barley-maize and wheat-maize these 2 parameters increased in response to every level of N fertilization applied. Additionally, fallow-maize and wheat-maize did not respond to the application of more than 200 kg of N ha-1. The legumes showed potential as previous crops that could replace fallow and cereals in silage maize production by reducing the amount of N fertilizer used on silage maize without significantly decreasing dry matter and N yield. Nonetheless, the cereals demonstrated high dry matter yields, based on annual production. According to regression analysis, the highest dry matter and N yields were obtained from the application of 198, 254, 211, 80, and 210 kg of N ha-1 after previous crops of wheat, barley, lentil, Hungarian vetch, and fallow, respectively.
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