Seed production characteristic of the lines KC 10 9 and XM 99 23
Valentina Valkova • Nataliya Petrovska
Maize Research Institute – Kneja, 5835, Bulgaria
Резюме
The article presents the agro biological and seed production characteristics of the inbred lines KC 10 9 and XM 99 23, respectively the maternal and paternal form of the Kneja 560 maize hybrid. The aim on the research is to trace the influence of the year of cultivation and the plant density of the yield and the seed production coefficient of the parental lines. The experimental work was carried out in the fields of the Maize Research Institute - Knezha during the period 2014-2018. The experiments were carried under conditions without irrigation, in three repetitions and in three plant densities – 4500 plant/da, 5500 plant/da and 6500 plant/da. The agrotechnical and the plant protection measures growing during vegetation were carried with the respective for the region method. It was found that the two lines realize the highest grain yield at a plant density of 6500 plant / da. The Vitality of the stigma of line KC 10 9 is kept until the 8-9 days after they appear out of the husked leaves wrapping, while with line XM 99 23 this indicator is 7-8. Depending on the cultivation conditions, the seed production coefficient of line KC 10 9 varies from 181,8 - 281,7, while ХМ 99 23 – 170,8 – 332,7.
Key words: Maize, Panicle, Cob, Seed production, Plant density
